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  • 1.
    Abraham, Sheela Ann
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Edwards, Katarina
    Karlsson, Göran
    MacIntosh, Scott
    Mayer, Lawrence D.
    McKenzie, Cheryl
    Bally, Marcel B.
    Formation of transition metal-doxorubicin complexes inside liposomes2002In: Biochimia et Biophysica Acta, Vol. 1565, p. 41-54Article in journal (Refereed)
  • 2. Abrahama, Sheela A
    et al.
    Edwards, Katarina
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Karlsson, Göran
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Hudona, Norma
    Mayera, Lawrence D.
    Bally, Marcel B.
    An evaluation of transmembrane ion gradient-mediated encapsulation of topotecan within liposomes2004In: Journal of Controlled Release, Vol. 96, no 3, p. 449-461Article in journal (Refereed)
  • 3.
    Abrahamsson, M. L. A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Tran, A.
    Sun, L.
    Åkermark, B.
    Styring, S.
    Mukhtar, E.
    Lindquist, S. E.
    Hammarström, L.
    Electron Transfer Kinetics for Ruthenium-Manganese Complexes Adsorbed onto Nanocrystalline TiO2 Films2001Article in journal (Refereed)
  • 4.
    Abrahamsson, Malin L. A.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Electron Transfer in Ruthenium-Manganese Complexes for Artificial Photosynthesis: Studies in Solution and on Electrode Surfaces2001Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In today’s society there is an increasing need for energy, an increase which for the most part is supplied by the use of fossil fuels. Fossil fuel resources are limited and their use has harmful effects on the environment, therefore the development of technologies that produce clean energy sources is very appealing. Natural photosynthesis is capable of converting solar energy into chemical energy through a series of efficient energy and electron transfer reactions with water as the only electron source. Thus, constructing an artificial system that uses the same principles to convert sunlight into electricity or storable fuels like hydrogen is one of the major forces driving artificial photosynthesis research.

    This thesis describes supramolecular complexes with the intention of mimicking the electron transfer reactions of the donor side in Photosystem II, where a manganese cluster together with a tyrosine catalyses the oxidation of water. All complexes are based on Ru(II)-trisbipyridine as a photosensitizer that is covalently linked to electron donors like tyrosine or manganese. Photochemical reactions are studied with time-resolved transient absorption and emission measurements. Electrochemical techniques are used to study the electrochemical behavior, and different photoelectrochemical techniques are used to investigate the complexes adsorbed onto titanium dioxide surfaces. In all complexes, intramolecular electron transfer occurs from the linked donor to photo-oxidized Ru(III). It is also observed that coordinated Mn(II) quenches the excited state of Ru(II), a reaction that is found to be distance dependent. However, by modifying one of the complexes, its excited state properties can be tuned in a way that decreases the quenching and keeps the electron transfer properties. The obtained results are of significance for the development of multinuclear Ru-Mn complexes that are capable of multi-electron transfer.

    List of papers
    1. Ruthenium-Manganese Complexes for Artificial Photosynthesis: Factors Controlling Intramolecular Electron Transfer and Excited State Quenching Reactions
    Open this publication in new window or tab >>Ruthenium-Manganese Complexes for Artificial Photosynthesis: Factors Controlling Intramolecular Electron Transfer and Excited State Quenching Reactions
    Show others...
    2002 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 41, no 6, p. 1534-1544Article in journal (Refereed) Published
    Abstract [en]

    Continuing our work toward a system mimicking the electron-transfer steps from manganese to P(680)(+) in photosystem II (PS II), we report a series of ruthenium(II)-manganese(II) complexes that display intramolecular electron transfer from manganese(II) to photooxidized ruthenium(III). The electron-transfer rate constant (k(ET)) values span a large range, 1 x 10(5)-2 x 10(7) s(-1), and we have investigated different factors that are responsible for the variation. The reorganization energies determined experimentally (lambda = 1.5-2.0 eV) are larger than expected for solvent reorganization in complexes of similar size in polar solvents (typically lambda approximately 1.0 eV). This result indicates that the inner reorganization energy is relatively large and, consequently, that at moderate driving force values manganese complexes are not fast donors. Both the type of manganese ligand and the link between the two metals are shown to be of great importance to the electron-transfer rate. In contrast, we show that the quenching of the excited state of the ruthenium(II) moiety by manganese(II) in this series of complexes mainly depends on the distance between the metals. However, by synthetically modifying the sensitizer so that the lowest metal-to-ligand charge transfer state was localized on the nonbridging ruthenium(II) ligands, we could reduce the quenching rate constant in one complex by a factor of 700 without changing the bridging ligand. Still, the manganese(II)-ruthenium(III) electron-transfer rate constant was not reduced. Consequently, the modification resulted in a complex with very favorable properties.

    National Category
    Physical Chemistry
    Identifiers
    urn:nbn:se:uu:diva-89491 (URN)10.1021/ic0107227 (DOI)11896722 (PubMedID)
    Available from: 2001-10-19 Created: 2001-10-19 Last updated: 2017-12-14Bibliographically approved
    2. A Biomimetic Model System for the Water Oxidizing Triad in Photosystem II
    Open this publication in new window or tab >>A Biomimetic Model System for the Water Oxidizing Triad in Photosystem II
    Show others...
    1999 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 121, no 1, p. 89-96Article in journal (Refereed) Published
    Abstract [en]

    In plants, solar energy is used to extract electrons from water, producing atmospheric oxygen. This is conducted by Photosystem II, where a redox ”triad” consisting of chlorophyll, a tyrosine, and a manganese cluster, governs an essential part of the process. Photooxidation of the chlorophylls produces electron transfer from the tyrosine, which forms a radical. The radical and the manganese cluster together extract electrons from water, providing the biosphere with an unlimited electron source. As a partial model for this system we constructed a ruthenium(II) complex with a covalently attached tyrosine, where the photooxidized ruthenium was rereduced by the tyrosine. In this study we show that the tyrosyl radical, which gives a transient EPR signal under illumination, can oxidize a manganese complex. The dinuclear manganese complex, which initially is in the Mn(III)/(III) state, is oxidized by the photogenerated tyrosyl radical to the Mn(III)/(IV) state. The redox potentials in our system are comparable to those in Photosystem II. Thus, our synthetic redox “triad” mimics important elements in the electron donor ”triad” in Photosystem II, significantly advancing the development of systems for artificial photosynthesis based on ruthenium−manganese complexes.

    Keywords
    Electron-Transfer, Y-Z, Photosynthesis, Mechanism, Complexes, Tyrosine, Oxygen, Light
    National Category
    Physical Chemistry
    Identifiers
    urn:nbn:se:uu:diva-89492 (URN)10.1021/ja981494r (DOI)
    Available from: 2001-10-19 Created: 2001-10-19 Last updated: 2017-12-14
    3. Hydrogen-Bond Promoted Intramolecular Electron Transfer to Photogenerated Ru(III): A Functional Mimic of TyrosineZ and Histidine 190 in Photosystem II
    Open this publication in new window or tab >>Hydrogen-Bond Promoted Intramolecular Electron Transfer to Photogenerated Ru(III): A Functional Mimic of TyrosineZ and Histidine 190 in Photosystem II
    Show others...
    1999 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 121, no 29, p. 6834-6842Article in journal (Refereed) Published
    Abstract [en]

    As a model for redox components on the donor side of photosystem II (PS II) in green plants, a supramolecular complex 4 has been prepared. In this, a ruthenium(II) tris-bipyridyl complex which mimics the function of P680 in PS II, has been covalently linked to a tyrosine unit which bears two hydrogen-bonding substituents, dipicolylamine (dpa) ligands. Our aim is to mimic the interaction between tyrosineZ and a basic histidine residue, namely His190 in PSII, and also to use the dpa ligands for coordination of manganese. Two different routes for the synthesis of the compound 4 are presented. Its structure was fully characterized by 1H NMR, COSY, NOESY, 13C NMR, IR, and mass spectrometry. 1H NMR and NOESY gave evidence for the existence of intramolecular hydrogen bonding in 4. The interaction between the ruthenium and the substituted tyrosine unit was probed by steady-state and time-resolved emission measurements as well as by chemical oxidation. Flash photolysis and EPR measurements on 4 in the presence of an electron acceptor (methylviologen, MV2+, or cobalt pentaminechloride, Co3+) showed that an intermolecular electron transfer from the excited state of Ru(II) in 4 to the electron acceptor took place, forming Ru(III) and the methylviologen radical MV+ or Co2+. This was followed by intramolecular electron transfer from the substituted tyrosine moiety to the photogenerated Ru(III), regenerating Ru(II) and forming a tyrosyl radical. In water, the radical has a g value of 2.0044, indicative of a deprotonated tyrosyl radical. In acetonitrile, a radical with a g value of 2.0029 was formed, which can be assigned to the tyrosine radical cation. In both solvents the electron transfer is intramolecular with a rate constant kET > 1 × 107 s-1. This is 2 orders of magnitude greater than the one for a similar compound 3, in which no dpa arm is attached to the tyrosine unit. Therefore the hydrogen bonding between the substituted tyrosine and the dpa arms in 4 is proposed to be responsible for the fast electron transfer. This interaction mimics the proposed His190 and tyrosineZ interaction in the donor side of PS II.

    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-89493 (URN)10.1021/ja984048c (DOI)
    Available from: 2001-10-19 Created: 2001-10-19 Last updated: 2017-12-14
    4. Towards an artificial model for Photosystem II: A manganese(II,II) dimer covalently linked to ruthenium(II) tris-bipyridine via a tyrosine derivative
    Open this publication in new window or tab >>Towards an artificial model for Photosystem II: A manganese(II,II) dimer covalently linked to ruthenium(II) tris-bipyridine via a tyrosine derivative
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    2000 (English)In: Journal of Inorganic Biochemistry, ISSN 0162-0134, E-ISSN 1873-3344, Vol. 78, no 1, p. 15-22Article in journal (Refereed) Published
    Abstract [en]

    In order to model the individual electron transfer steps from the manganese cluster to the photooxidized sensitizer P680+ in Photosystem II (PS II) in green plants, the supramolecular complex 4 has been synthesized. In this complex, a ruthenium(II) tris-bipyridine type photosensitizer has been linked to a manganese(II) dimer via a substituted L-tyrosine, which bridges the manganese ions. The trinuclear complex 4 was characterized by electron paramagnetic resonance (EPR) and electrospray ionization mass spectrometry (ESI-MS). The excited state lifetime of the ruthenium tris-bipyridine moiety in 4 was found to be about 110 ns in acetonitrile. Using flash photolysis in the presence of an electron acceptor (methylviologen), it was demonstrated that in the supramolecular complex 4 an electron was transferred from the excited state of the ruthenium tris-bipyridine moiety to methylviologen, forming a methylviologen radical and a ruthenium(III) tris-bipyridine moiety. Next, the Ru(III) species retrieved the electron from the manganese(II/II) dimer in an intramolecular electron transfer reaction with a rate constant kET > 1.0 x 10(7) s(-1), generating a manganese(II/III) oxidation state and regenerating the ruthenium(II) photosensitizer. This is the first example of intramolecular electron transfer in a supramolecular complex, in which a manganese dimer is covalently linked to a photosensitizer via a tyrosine unit, in a process which mimics the electron transfer on the donor side of PS II.

    Keywords
    ruthenium complexes, manganese dimer complexes, artificial photosynthesis, electron transfer, photosystem II, ELECTRON-TRANSFER, MNIIMNIII COMPLEXES, PHOTOSYNTHESIS, PROTEINS, CATALASE, SPECTRA, ENZYMES, SYSTEMS, REDOX
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-89494 (URN)10.1016/S0162-0134(99)00200-7 (DOI)10714701 (PubMedID)
    Available from: 2001-10-19 Created: 2001-10-19 Last updated: 2017-12-14
    5. Ruthenium Trisbipyridyl Complexes Covalently Linked to Phenolate Ligands that Coordinates Manganese
    Open this publication in new window or tab >>Ruthenium Trisbipyridyl Complexes Covalently Linked to Phenolate Ligands that Coordinates Manganese
    Show others...
    Article in journal (Refereed) In press
    Identifiers
    urn:nbn:se:uu:diva-89495 (URN)
    Available from: 2001-10-19 Created: 2001-10-19 Last updated: 2010-01-14Bibliographically approved
    6. Electron Transfer Kinetics for Ruthenium-Manganese Complexes Adsorbed onto Nanocrystalline TiO2 Films
    Open this publication in new window or tab >>Electron Transfer Kinetics for Ruthenium-Manganese Complexes Adsorbed onto Nanocrystalline TiO2 Films
    Show others...
    2001 (English)Article in journal (Refereed) In press
    Identifiers
    urn:nbn:se:uu:diva-89496 (URN)
    Available from: 2001-10-19 Created: 2001-10-19 Last updated: 2014-01-24Bibliographically approved
  • 5.
    Abrahamsson, Malin L. A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Berglund Baudin, Helena
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Tran, A.
    Philouze, C.
    Berg, K.
    Raymond-Johansson, Mary Katherine
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Sun, L.
    Åkermark, B.
    Styring, S.
    Hammarström, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Ruthenium-Manganese Complexes for Artificial Photosynthesis: Factors Controlling Intramolecular Electron Transfer and Excited State Quenching Reactions2002In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 41, no 6, p. 1534-1544Article in journal (Refereed)
    Abstract [en]

    Continuing our work toward a system mimicking the electron-transfer steps from manganese to P(680)(+) in photosystem II (PS II), we report a series of ruthenium(II)-manganese(II) complexes that display intramolecular electron transfer from manganese(II) to photooxidized ruthenium(III). The electron-transfer rate constant (k(ET)) values span a large range, 1 x 10(5)-2 x 10(7) s(-1), and we have investigated different factors that are responsible for the variation. The reorganization energies determined experimentally (lambda = 1.5-2.0 eV) are larger than expected for solvent reorganization in complexes of similar size in polar solvents (typically lambda approximately 1.0 eV). This result indicates that the inner reorganization energy is relatively large and, consequently, that at moderate driving force values manganese complexes are not fast donors. Both the type of manganese ligand and the link between the two metals are shown to be of great importance to the electron-transfer rate. In contrast, we show that the quenching of the excited state of the ruthenium(II) moiety by manganese(II) in this series of complexes mainly depends on the distance between the metals. However, by synthetically modifying the sensitizer so that the lowest metal-to-ligand charge transfer state was localized on the nonbridging ruthenium(II) ligands, we could reduce the quenching rate constant in one complex by a factor of 700 without changing the bridging ligand. Still, the manganese(II)-ruthenium(III) electron-transfer rate constant was not reduced. Consequently, the modification resulted in a complex with very favorable properties.

  • 6.
    Abrahamsson, Maria
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Accelerator mass spectrometry group. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Wolpher, Henriette
    Johansson, Olof
    Larsson, Jan
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Kritikos, Mikael
    Eriksson, Lars
    Norrby, Per-Ola
    Bergquist, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
    Sun, Licheng
    Åkermark, Björn
    Hammarström, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    A New Strategy for the Improvement of Photophysical Properties in Ruthenium(II) Polypyridyl Complexes: Synthesis and Photophysical and Electrochemical Characterization of Six Mononuclear Ruthenium(II) Bisterpyridine-Type Complexes2005In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 44, no 9, p. 3215-3225Article in journal (Refereed)
  • 7. Abrahmsen-Alami, S
    et al.
    Persson, K
    Stilbs, P
    Alami, E
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Effect of temperature on NMR self-diffusion in aqueous associative polymer solutions1996In: Journal of Physical Chemistry, Vol. 100, no 11, p. 4598-4605Article in journal (Refereed)
    Abstract [en]

    The temperature dependence of polymer self-diffusion rates in aqueous solutions of C12EO200C12 (AP9, Mw = 9300) and C12EO90C12 (AP4, Mw = 4600) and nonmodified analogues PEO10 and PEO4 (Mw = 10 000 and 3400) has been studied. The effect of the hydrophobic end-groups on the self-diffusion of the associative polymer (AP) was found to be proportional to the polymer content and inversely related to the temperature. The variation of the AP self-diffusion coefficient follows an Arrhenius behavior. The resulting apparent activation energies, Ea, increase with polymer content from 15 to 55 kJ/mol in the range 0.5−50 wt % for AP9, whereas the parent PEO10 shows an almost constant Ea of about 25 kJ/mol in the same concentration range. Activation energies derived from self-diffusion and low shear viscosity measurements were found to be quite similar. The distribution of self-diffusion coefficients often observed in AP systems is discussed in terms of distribution of aggregate sizes at low AP content and homogeneity of the network at higher contents. The residence time of an AP monomer in a hydrophobic domain was estimated as 0.1 ms at 25 °C and decreases with temperature. Also included are turbidity measurements on the AP systems.

  • 8. Abrahmsén-Alami, S
    et al.
    Stilbs, P
    Alami, Elouafi
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Water self-diffusion in aqueous associative polymer solutions1996In: JOURNAL OF PHYSICAL CHEMISTRY, Vol. 100, no 16, p. 6691-6697Article in journal (Refereed)
    Abstract [en]

    Water self-diffusion in aqueous model associative polymer (AP) solutions, hydrophobically end-capped poly(ethylene oxide), C12EO200C12 (AP9,) and C12EO90C12 (AP4), has been studied with the NMR-PGSE method and compared to the diffusion in nonmodified poly(ethylene oxide) PEO. It was found that it decreases monotonically with increasing polymer concentration, giving Di/D0 ≈ 0.2 at 50 wt % (D0 being the water self-diffusion coefficient in the absence of polymer), independently of polymer molecular weight and modification. In further evaluation of the data, the cell-diffusion model was used. Such an analysis suggests that up to a polymer content of about 2 wt % AP9, water diffusion is not significantly affected by the polymer. Above this concentration, up to about 10 water molecules per EO group are affected in AP9 and AP4 solutions. On increasing the temperature, water self-diffusion increases, following an Arrhenius-like equation, with Ea equal to that of pure water at low polymer content (10 wt %). The activation energy increases with polymer content, and at 50 wt %, Ea is about 30 kJ/mol, independently of polymer type. A minor difference in Ea between AP4 and AP9 solutions at intermediate polymer content is likely to originate from the ability of AP4 to form well-developed cubic phase structures. An increase in temperature was found to lead to a slight dehydration of the associative polymer EO monomers closest to the hydrophobic core.

  • 9.
    Alami, E
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Almgren, Mats
    Brown, Wyn
    Interaction of hydrophobically end-capped poly(ethylene oxide) with nonionic surfactants in aqueous solution. Fluorescence and light scattering studies1996In: MACROMOLECULES, ISSN 0024-9297, Vol. 29, no 14, p. 5026-5035Article in journal (Refereed)
    Abstract [en]

    In ternary mixtures of an associative polymer (AP), hydrophobically end-capped poly(ethylene oxide), C(12)EO(460)C(12), and the nonionic surfactant, C(12)E(8), hydrophobic microdomains are formed at much lower concentrations than the cac and cmc of the bi

  • 10.
    Alami, E
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Almgren, Mats
    Brown, Wyn
    Francois, Jeanette
    Aggregation of hydrophobically end-capped poly(ethylene oxide) in aqueous solutions. Fluorescence and light-scattering studies1996In: MACROMOLECULES, Vol. 29, no 6, p. 2229-2243Article in journal (Refereed)
    Abstract [en]

    The association of a monodisperse model associative polymer, hydrophobically end-capped poly(ethylene oxide), denoted C(12)EO(460)C(12), in aqueous solution has been studied. The macroscopic properties have been investigated by theological methods and cor

  • 11.
    Alami, Eloi
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    AbrahmsenAlami, Susanna
    Vasilescu, Marilena
    Almgren, Mats
    A comparison between hydrophobically end-gapped poly(ethylene oxide) with ether and urethane bonds1997In: JOURNAL OF COLLOID AND INTERFACE SCIENCE, ISSN 0021-9797, Vol. 193, no 2, p. 152-162Article in journal (Refereed)
    Abstract [en]

    Two models of HEUR (hydrophobically modified ethylene oxide urethane) associative polymers (AP) are compared. The two polymers are polyethyleneoxides simply end-capped with dodecyl groups, one through an ether bond H25C12-O-(CH2CH2O)(304)-C12H25 (AP14, M-

  • 12.
    Almgren, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Mixed micelles and other structures in the solubilization of bilayer lipid membranes by surfactants2000In: BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES, Vol. 1508, no 1-2, p. 146-163Article, book review (Other scientific)
    Abstract [en]

    The solubilization of lipid bilayers by surfactants is accompanied by morphological changes of the bilayer and the emergence of mixed micelles. From a phase equilibrium perspective, the lipid/surfactant/water system is in a two-phase area during the solub

  • 13.
    Almgren, M
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Edwards, K
    Karlsson, G
    Cryo transmission electron microscopy of liposomes and related structures2000In: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, ISSN 0927-7757, Vol. 174, no 1-2, p. 3-21Article in journal (Refereed)
    Abstract [en]

    Cryo-transmission electron microscopy, c-TEM, has during the last 10 years contributed significantly to the understanding of the numerous, and often complex, structures formed by amphiphilic molecules in dilute aqueous solutions. In particular, the method

  • 14.
    Almgren, M
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Gimel, JC
    Wang, K
    Karlsson, G
    Edwards, K
    Brown, W
    Mortensen, K
    SDS micelles at high ionic strength. A light scattering, neutron scattering, fluorescence quenching, and CryoTEM investigation1998In: JOURNAL OF COLLOID AND INTERFACE SCIENCE, ISSN 0021-9797, Vol. 202, no 2, p. 222-231Article in journal (Refereed)
    Abstract [en]

    Sodium dodecyl sulfate (SDS) in 0.8 M NaCl in D2O has been studied by small-angle neutron scattering (SANS), dynamic light scattering (DLS), and time-resolved fluorescence quenching (TRFQ) measurements in the concentration range from 10 to 80 mM and at te

  • 15.
    Almgren, Mats
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Alexander Lecture 2003: Cubosomes, Vesicles, and Perforated Bilayers in Aqueous Systems of Lipids, Polymers, and Surfactants2003In: Australian Journal of Chemistry, Vol. 56, p. 959-970Article in journal (Refereed)
  • 16.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Alami, Aloui
    Lindblad, Cecilia
    Aggregative interactions of hydrophobically end-capped poly(ethylene oxide) with surfactants1997In: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 213, p. 7-COLLOther (Other scientific)
  • 17.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Barzykin, Alexander
    Surfactant distribution in non-ideal mixed micelles.1996In: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 211, p. 197-COLLOther (Other scientific)
  • 18.
    ALMGREN, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    BROWN, Wyn
    HVIDT, Soren
    SELF-AGGREGATION AND PHASE-BEHAVIOR OF POLY(ETHYLENE OXIDE) POLY(PROPYLENE OXIDE) POLY(ETHYLENE OXIDE) BLOCK-COPOLYMERS IN AQUEOUS-SOLUTION1995In: COLLOID AND POLYMER SCIENCE, ISSN 0303-402X, Vol. 273, no 1, p. 2-15Article in journal (Refereed)
    Abstract [en]

    The phase behavior and aggregation properties of block copolymers of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (Pluronics, poloxamers) in aqueous solution have recently attracted much attention. Both experimental and theoretical stud

  • 19.
    Almgren, Mats
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Edwards, Katarina
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Gustafsson, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Cryotransmission electron microscopy of thin vitrified samples.1996In: Current Opinion in Colloid & Interface Science, ISSN 1359-0294, E-ISSN 1879-0399, Vol. 1, no 2, p. 270-278Article in journal (Refereed)
    Abstract [en]

    During the past few years cryotransmission electron microscopy (EM) of vitrified thin samples has gained acceptance as a standard method in the arsenal of the colloid and interface scientist. The seemingly direct visualization of fluid colloidal structures during the use of cryotransmission EM is both convincing and reliable to the scientist who nowadays has an increasing awareness of the limitations and pitfalls of instrumentation. Notable recent observations include branched threadlike micelles, faceted particles (cubosomes) of a dispersed cubic phase and transitions of certain structures from globular micelles via bilayers to reversed structures. These transitions may be caused by changes of compos ition, temperature, pH, or salt concentration.

  • 20.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Garamus, Vasil M.
    Small Angle Neutron Scattering Study of Demixing in Micellar Solutions Containing CTAC and a Partially Fluorinated Cationic Surfactant2005In: Journal of Physical Chemistry B, Vol. 109, no 22, p. 11348-11353Article in journal (Refereed)
  • 21.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Hansson, Per
    Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Pharmacy.
    Fluorescence studies of micelles2002Chapter in book (Refereed)
  • 22.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Hansson, Per
    Wang, Ke
    Distribution of surfactants in a nonideal mixed micellar system. Effect of a surfactant quencher on the fluorescence decay of solubilized pyrene1996In: LANGMUIR, ISSN 0743-7463, Vol. 12, no 16, p. 3855-3858Article in journal (Refereed)
    Abstract [en]

    We calculate a distribution of the surfactants in nonideal mixed micelles of equal size, which is consistent with the regular solution expressions for the concentrations of the free surfactants in equilibrium with the micellar pseudophase. The distributio

  • 23.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Mays, Holger
    Time-Resolved Luminescence Quenching in Microemulsions1999In: Handbook of Microemulsion Science and Technology, 1999, p. 605-628Chapter in book (Other (popular scientific, debate etc.))
  • 24.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Rangelov, Stanislav
    Spontaneously formed nonequilibrium vesicles of cetyltrimethylammonium bromide and sodium octyl sulfate in aqueous dispersions.2004In: Langmuir, ISSN 0743-7463, Vol. 20, no 16, p. 6611-8Article in journal (Refereed)
  • 25.
    Almgren, Mats
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Wang, Ke
    Asakawa, Toyoshi
    Fluorescence quenching studies of micellization and solubilization in fluorocarbon-hydrocarbon surfactant mixtures1997In: LANGMUIR, ISSN 0743-7463, Vol. 13, no 17, p. 4535-4544Article in journal (Refereed)
    Abstract [en]

    Time-resolved fluorescence quenching studies of nonionic, anionic, and cationic micelles have been performed to compare two surfactant quenchers, a fluorocarbon surfactant quencher, N-(1,1,2,2-tetrahydroperfluorodecanyl)pyridinium chloride (HFDePC) and a

  • 26.
    Andersson, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Linke, M
    Chambron, JC
    Davidsson, J
    Heitz, V
    Sauvage, JP
    Hammarstrom, L
    Porphyrin-containing [2]-rotaxanes: Metal coordination enhanced superexchange electron transfer between noncovalently linked chromophores2000In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, ISSN 0002-7863, Vol. 122, no 14, p. 3526-3527Article in journal (Refereed)
  • 27.
    Andersson, M.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Linke, Myriam
    Chambron, Jean-Claude
    Davidsson, Jan
    Heitz, Valérie
    Sauvage, Jean-Pierre
    Hammarström, Leif
    Prophyrin-containing [2]-Rotaxanes: Metal Coordination Enhanced Superexchange Electron Transfer between Noncovalently Linked Chromophores2000In: Journal of the american chemical society, no 122, p. 3526-3527Article in journal (Refereed)
  • 28.
    Andersson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Råsmark, Per Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Elvingson, Christer
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Hansson, Per
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.
    Single microgel particle studies demonstrate the influence of hydrophobic interactions between charged micelles and oppositely charged polyions.2005In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 21, no 9, p. 3773-3781Article in journal (Refereed)
    Abstract [en]

    The binding of two cationic surfactants, dodecyltrimethylammonium bromide (DoTAB) and N-(1,1,2,2-tetrahydroperfluorodecanyl)pyridinium bromide (HFDePB), to covalently cross-linked sodium poly(styrenesulfonate) (PSS) microgels has been investigated by means of micromanipulator-assisted time-resolved light microscopy on single gels. It is demonstrated that repeated measurements on the same microgel under conditions of controlled liquid flow give highly reproducible results. The two surfactants are found to behave very differently with respect to degree of swelling, surfactant distribution in the gels, both during shrinking and at equilibrium, and kinetics of volume changes induced by them. The main difference is attributed to the presence of a hydrophobic interaction between PSS and the DoTAB micelles, absent in the case of HFDePB. Kinetic shrinking curves are recorded and analyzed using a model for steady-state transport of surfactant between the solution and the gels. Aggregation numbers for DoTAB in PSS solutions obtained from fluorescence quenching measurements are presented. A strong dependence on the surfactant-to-polyion concentration ratio is observed. Relations between surfactant binding isotherms, phase diagrams for linear polyelectrolyte/surfactant/water systems, and the binding to gels are discussed.

  • 29.
    Andersson, Mikael
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Tuning electron transfer reactions by selective excitation in porphyrin-acceptor assemblies2000Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis concerns electron transfer reactions from different excited states in porphyrins, and the effect of changing the energy of the link connecting the donor and acceptor. Photoinduced electron transfer, and subsequent processes were studied using ultrashort laser pulses and nanosecond laser flash photolysis.

    Excitation of Zn(II)-porphyrins in the Soret band lead to population of the higher lying S2 state. The lifetime and transient absorption spectrum was measured for the S2 state. When an electron acceptor was attached to the Zn(II)-porphyrin, either as an ion pair, or covalently bound through an amide link, electron transfer was found to compete with S2 to S1 relaxation. In the ion pair, electron transfer was faster than 200 fs, with a lifetime of the charge separated state of 1.3 ps. Further, in the covalently linked dyad, the Zn(II) porphyrin triplet state was repopulated from a charge transfer state.

    In [2]-rotaxanes, the Zn(II) porphyrin donor (ZnP) and Au(III) porphyrin acceptor (AuP+) are not connected by a direct covalent link. Selective excitation of either the ZnP or the AuP+ resulted in rapid electron transfer from the ZnP to the AuP+. The bis-phenanthroline link connecting the. different porphyrins was changed by coordination of Cu(I) or Ag(I). Electron transfer from the 1ZnP singlet was unaffected by coordination of either Ag(I) or Cu(I), while electron transfer to the 3AuP+ triplet was in the Ag(I) link found to occur by an enhanced superexchange, and by a sequential mechanism in the Cu(I) coordinated link.

  • 30.
    Andersson, Mikael
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Davidsson, Jan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Hammarström, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Korppi-Tommola, Jouko
    Petola, Timo
    Photoinduced Energy Transfer Reactions in a Porphyrin-Viologen Complex: Observation of S2 to S1 Relaxation and Electron Transfer from the S2 state1999In: J. Phys. Chem. B, Vol. 103, no 16, p. 3258-3262Article in journal (Refereed)
  • 31.
    Andersson, Mikael
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Hammarström, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Edwards, Katarina
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Effect of bilayer phase transitions on vesicle structure and its influence on the kinetics of viologen reduction.1995In: Journal of physical chemistry, ISSN 0022-3654, Vol. 99, no 39, p. 14531-14538Article in journal (Other academic)
    Abstract [en]

    Vesicles were prepared from pure phosphatidylcholines (PC), phosphatidic acids (PA), or dioctadecyldimethylamonium bromide (DODAB). The aggregate structure was examined above and below the gel-to-liquid crystalline transition temperature (T-m) by means of cryo-transmission electron microscopy. The redox reaction between a membrane bound viologen and dithionite was studied in the different lipid systems. It was found that the presence of faceted vesicles or open bilayer fragments, below T-m, lead to double-exponential reduction kinetics.

  • 32.
    Andersson, Mikael
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Linke, Myriam
    Chambron, Jean-Claude
    Davidsson, Jan
    Heitz, Valérie
    Hammarström, Leif
    Sauvage, Jean-Pierre
    Long-Range Electron Transfer in Porphyrin-Containing [2]-Rotaxanes: Tuning the Rate by Metal Cation Coordination2002In: J. Am. Chem. Soc. (JACS), Vol. 124, p. 4347-4362Article in journal (Refereed)
  • 33.
    Andersson, MM
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Hatti-Kaul, R
    Brown, W
    Dynamic and static light scattering and fluorescence studies of the interactions between lactate dehydrogenase and poly(ethyleneimine)2000In: JOURNAL OF PHYSICAL CHEMISTRY B, ISSN 1089-5647, Vol. 104, no 15, p. 3660-3667Article in journal (Refereed)
    Abstract [en]

    Interactions between poly(ethyleneimine) (PEI) and porcine muscle lactate dehydrogenase (LDH) were studied using static and dynamic light scattering, and intrinsic fluorescence spectroscopy. Time-related aggregation of the enzyme was reduced in the presen

  • 34.
    Andersson, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Davidsson, J
    Hansson, T
    Rydberg state-mediated photoionisation of dissociating NaK wave packets in the B-1 Pi state2000In: CHEMICAL PHYSICS LETTERS, ISSN 0009-2614, Vol. 322, no 5, p. 439-446Article in journal (Refereed)
    Abstract [en]

    The photoionisation dynamics of NaK molecules in the (BII)-I-1: state is studied in both frequency and time domain by femtosecond laser spectroscopy. Comparison to model calculations shows that the photoionisation proceeds via intermediate-to-high-n Rydbe

  • 35. Andersson, R.
    et al.
    Kadi, M.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Davidsson, J.
    Hansson, T.
    Photoionization of molecular wavepackets - the NaK (C1Σ+) case2002In: Chem. Phys. Lett., Vol. 352, p. 106-112Article in journal (Refereed)
  • 36.
    Andersson, Renée
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Kadi, Malin
    Davidsson, Jan
    Hansson, Tony
    Photoionisation of molecular wavwpackets - the NaK(C1S+) case2002In: Chemical Physics Letters, Vol. 352, p. 106-112Article in journal (Refereed)
  • 37. Andres, J
    et al.
    Moliner, V
    Safont, VS
    Aullo, JM
    Diaz, W
    Tapia, Orlando
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Transition structures for hydride transfer reactions in vacuo and their role in enzyme catalysis1996In: Journal of Molecular Structure: THEOCHEM, ISSN 0166-1280, Vol. 371, p. 299-312Article, review/survey (Refereed)
    Abstract [en]

    A general discussion as to the role of in vacuo transition structure in enzyme catalysis is presented. Quantum mechanical aspects are emphasized. The transition structures defined as saddle points of index one (SPi-1) for the hydride transfer step on different model enzyme systems from flavoproteins to dehydrogenases have been characterized with analytical gradients at different levels of theory: semi-empirical; ab initio with different basis sets within the Hartree-Fock scheme; density functional theory using different approaches. Quantum chemical characteristics of the SPi-1 are used to discuss hydride transfer step in enzyme catalyzed reactions and mechanistic implications.

    With the exception of dihydrofolate reductase, the results for all other systems studied suggest that the endo relative orientation imposed by the active site on the reactants is essential for polarizing the CdHt bond and situating the system in the quadratic region of the endo SPi-1. The geometry and transition vector components are both model independent and weakly dependent on the level of theory used in their determination. Comparisons of the SPi-1 geometries with available X-ray coordinates show that the SPi-1 can be fitted without any stress at the active site. The geometrical arrangement of the SPi-1 results in optimal frontier LUMO orbital interactions, and the transition vector amplitudes show primary and secondary isotope effects to be strongly coupled.

    A comparison between simple and sophisticated molecular models shows that there is a minimal molecular model associated with geometrical parameters describing the essentials of the chemical interconversion step. For hydride transfer, the corresponding transition vector is an invariant feature.

  • 38.
    Aranyos, V
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Grennberg, Helena
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Tingry, S
    Lindquist, Sten-Eric
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Electrochemical and photoelectrochemical investigation of new carboxylatobipyridine (bis-bipyridine)ruthenium(II) complexes for dye-sensitized TiO2 electrodes2000In: SOLAR ENERGY MATERIALS AND SOLAR CELLS, ISSN 0927-0248, Vol. 64, no 2, p. 97-114Article in journal (Refereed)
    Abstract [en]

    Methods for the preparation and purification of new carboxylated 2,2'-bipyridine ligands, two of which contain the new anchoring functionality malonate, and a reliable method for the synthesis of the corresponding [Ru(bpy)(2)(L)](PF6)(2) complexes are des

  • 39.
    Aranyos, Viviane
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Hagfeldt, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry I.
    Grennberg, Helena
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Organisk kemi.
    Figgemeier, Egbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Electropolymerisable bipyridine ruthenium(II) complexes: synthesis, spectroscopic and electrochemical characterisation of 4-((2-thienyl)ethenyl)-and 4,4'-di((2-thienyl) ethenyl)-2,2'-bipyridine ruthenium complexes2004In: Polyhedron, Vol. 23, p. 589-598Article in journal (Refereed)
    Abstract [en]

    Four new ruthenium polypyridyl complexes with mono- or di-((2-thienyl) ethenyl) substituted bipyridines have been synthesized. The complexes were characterized by NMR, elemental analysis, UV-Vis absorption and electrochemistry (differentioal pulse and cyclic voltammetry). Electroactive polymer films of these complexes have been prepared by oxidative electropolymerisation and characterized by UV-Vis absorption spectroscopy and electrochemistry. The electrochemically induced polymerisation of the complexes resulted in a significant shift of the oxidation potential of the Ru(II)-Ru(III) process towards more positive potentials. Also, MLCT absorption band of the polymeric complexes is shifted towards shorter wavelengths. These results are interpreted in terms of an interrupiton of the conjugated system of the (2-thienyl)ethenyl-substituted bipyridine ligands due to a radical polymerisation mechanism affecting rather the ethenyl part of the ligand than the thienyl.

  • 40. Aranyos, Viviane
    et al.
    Hjelm, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Hagfeldt, Anders
    Grennberg, Helena
    Electropolymerisable bipyridine ruthenium(II) complexes. Synthesis and electrochemical characterisation of 4-(3-methoxystyryl)- and 4,4'-di(3-methoxystyryl)-2,2'-bipyridine ruthenium complexes2001In: Journal of the Chemical Society - Dalton Transactions, ISSN 1472-7773, no 8, p. 1319-1325Article in journal (Refereed)
  • 41.
    Aranyos, Viviane
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Hjelm, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Grennberg, Helena
    Free-base tetra-arylphthalocyanines for dye-sensitised nanostructured solar cell applications2001In: JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, ISSN 1088-4246, Vol. 5, no 8, p. 609-616Article in journal (Refereed)
    Abstract [en]

    Adsorption of phthalocyanines lacking conventional attaching substituents onto nanostructured TiO2 electrodes has been studied, and some of the important factors for sensitisation have been identified. Tetra-dimethoxyphenyl phthalocyanine (2) and tetra-ph

  • 42.
    Aranyos, Viviane
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Hjelm, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Grennberg, Helena
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Tuning the properties of ruthenium bipyridine dyes for solar cells by substitution on the ligands – characterisation of bis[4,4’-di(2-(3-methoxyphenyl)ethenyl)-2,2’-bipyridine][4,4’-dicarboxy-2,2’-bipyridine]ruthenium(II) dihexafluorophosphate2003In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, p. 1280-1283Article in journal (Refereed)
  • 43.
    Arteca, G A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Reimann, C T
    Tapia, O
    Role of electrostatic and van der Waals interactions on the in vacuo unfolding dynamics of lysozyme ions2001In: Chemical Physics Letters, Vol. 350, p. 277-285Article in journal (Refereed)
  • 44.
    Arteca, G. A.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Tapia, O.
    Comparison between a generalized electronic diabatic approach and the Born-Oppenheimer separation scheme in inertial frames2004In: Journal of Mathematical Chemistry, Vol. 35, no 1, p. 1-19Article in journal (Refereed)
  • 45.
    Arteca, G. A.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Tapia, O.
    On the nature of the unfolded state: competing mechanisms in the unfolding of anhydrous protein ions2004In: Chemical Physics Letters, Vol. 383, no 5-6, p. 462-468Article in journal (Other scientific)
  • 46.
    Arteca, G A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
    Tapia, O
    Protein Denaturation in Vacuo. Behavior of the Four-a-Helix Bundle of Apotochrome c' under Centrifugal Unfolding Conditions2002In: Journal of Physical Chemistry B, Vol. 106, p. 1081-1089Article in journal (Refereed)
  • 47.
    Arteca, GA
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Edvinsson, T
    Elvingson, C
    Compaction of grafted wormlike chains under variable confinement2001In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS, ISSN 1463-9076, Vol. 3, no 17, p. 3737-3741Article in journal (Refereed)
    Abstract [en]

    We study the mean molecular shape features for a model of wormlike chains with variable persistence length and nonbonded pair interactions. The chains are modelled as end-grafted and confined within an infinite slab with variable thickness. By using two i

  • 48.
    Arteca, GA
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.