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  • 51.
    Andersson, Y
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Larsson, T
    Nolang, B
    Rundqvist, S
    Neutron powder diffraction investigations of Nb-3(Al0.84Nb0.16) and Nb-3(Al0.84Nb0.16)H-2(2.52)2000In: JOURNAL OF ALLOYS AND COMPOUNDS, ISSN 0925-8388, Vol. 306, no 1-2, p. 193-196Article in journal (Refereed)
    Abstract [en]

    The crystal structures of Nb-3(Al0.84Nb0.16) and Nb-3(Al0.84Nb0.16)H-2(2.52) have been refined from neutron powder diffraction data using the Rietveld method. Nb-3(Al0.84Nb0.16) crystallizes in the cubic Cr3Si-type structure, space group Pm3n, with the un

  • 52.
    Andersson, Örjan
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
    Two Modified 2,3-Diamino-naphthalenes for Spectro-fluorimetric Determination of Selenium in Biological Samples1995Licentiate thesis, monograph (Other academic)
  • 53.
    Antoni G., Amschler H., Zech K., Långström B.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Synthesis of [18F]labelled roflumilast using difluoro[18F]bromo methane as alkylating agent2001In: Synthesis and Applications of Isotopically LabelledArticle in journal (Refereed)
  • 54.
    Antoni G., Ögren M., Långström B.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Enzymes as catalysts in labelling synthesis using short-lived radionuclides2001In: Synthesis and Applications of Isotopically LabelledArticle in journal (Refereed)
  • 55.
    Antoni, Gunnar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Kihlberg, T.
    Långström, B.
    11C: Labelling chemistry and labelled compounds2003In: Handbook Chem03_0302, 2003, no 332, p. 119-165Chapter in book (Refereed)
  • 56.
    Antoni, Gunnar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Långström, Bengt
    Asymmetric synthesis of L-2-amino[3-11C]butyric acid, L-[3-11C]norvaline and L-[3-11C]valine.1987In: Acta Chemica Scandinavica, ISSN 0904-213X, E-ISSN 1902-3103, Vol. B41, p. 511-Article in journal (Refereed)
  • 57.
    Antoni, Gunnar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Långström, Bengt
    Synthesis of DL-11C-labelled alanine, 2-aminobutyric acid, norvaline, leucine and phenylalanine and preparation of L-[3-11C]alanine and L-[3-11C]phenylalanine.1987In: Journal of labelled compounds & radiopharmaceuticals, ISSN ISSN 0362-4803, EISSN 1099-1344, Vol. 24, p. 125-Article in journal (Refereed)
  • 58.
    Antoni, Gunnar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Långström, Bengt
    Synthesis of DL-[3-11C]valine using [2-11C]isopropyl iodide and preparation of L-[3-11C]valine by treatment with D-amino acid oxidase.1987In: Int. J. Appl. Radiat. Isot., Vol. 38, p. 655-Article in journal (Refereed)
  • 59.
    Antoni, Gunnar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Långström, Bengt
    Synthesis of gamma-amino[4-11C]butyric acid.1989In: Journal of labelled compounds & radiopharmaceuticals, ISSN 0362-4803, E-ISSN 1099-1344, Vol. 27, p. 571-Article in journal (Refereed)
  • 60.
    Antoni, Gunnar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Omura, H
    Ikemoto, M
    Moulder, R
    Watanabe, Y
    Långström, B
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
    Enzyme catalysed synthesis of L-(4-11C) aspartate and L-(5-11C) glutamate2001In: J. Labbelled Compd. Radiopharm.Article in journal (Other academic)
  • 61.
    Antoni, Gunnar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Ulin, Johan
    Långström, Bengt
    Synthesis of the 11C-labelled b-adrenargic receptor ligands atenolol, metoprolol and propranol.1989In: The international journal of applied radiation and isotopes, ISSN 0020-708X, E-ISSN 1878-1284, Vol. 40, p. 561-Article in journal (Refereed)
  • 62. Aquilonius, Sten-Magnus
    et al.
    Bergström, Kjell
    Eckernäs, S.A
    Hartvig, Per
    Leenders, K.L.
    Lundkvist, Hans
    Antoni, Gunnar
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Rimland, Annika
    Ulin, Johan
    Långström, Bengt
    In vivo visualization of striatal dopamine reuptake sites using [11C]nomifensine and       positron emission tomography.,1987In: Acta Neurol. Scand., Vol. 76, p. 283-287Article in journal (Refereed)
  • 63.
    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

  • 64.
    Aranyos, Viviane
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Dyes and their adsorption onto nanocrystalline TiO2 electrodes: Synthesis, characterisation and applications2000Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The syntheses of two type of dyes (phthalocyanine and ruthenium tris-bipyridyl) are presented here. Their characterisation involves the use of cyclic voltammetry, NMR- and UV-visible spectroscopy. Once adsorbed on nanocrystalline TiO2 electrodes, their electrochemical, spectroelectrochemical and photoelectrochemical properties were investigated.

    In the first part, the syntheses of aryl-substituted phthalocyanines are described. The key intermediate, an aryl-substituted phthalonitrile, was prepared by a Pd(0)-catalysed Stille-coupling. The physical properties of tetra-(2,5-dirnetoxyphenyl)phthalocyanine (1a), tetraphenylphthalocyanine (1b) are discussed, An interesting display behaviour was characterised by spectroelectrochemistry in the case of 1b. Considering the system, unexpectedly high efficiencies of the resulting solar cells are observed for both dyes.

    The second part deals with two types of ruthenium tris-bipyridyl complexes. Syntheses of three carboxylated heteroleptic ruthenium complexes [Ru(bpy)2(bpy-R)](PF6)2 (bpy-R, R= (COOLi)n, n= 1, 2, 4) were synthesised for a study of the influence of the number of carboxylic groups on solar cell efficiencies. A lateral electron transfer mechanism for the dyes adsorbed on TiO2, is observed. Homoleptic and heteroleptic ruthenium complexes possessing the polymerisable groups vinyl, methoxyphenyl or thiophene were prepared for an investigation of the substituent effect on the dye-monolayer in the solar cell, both by electrochemistry and absorption spectroscopy. The methoxyphenyl-substituted complexes showed good polymerisation behaviour both at negative and at positive potentials. They also showed good resistance towards water when adsorbed onto TiO2 electrodes.

  • 65.
    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.

  • 66.
    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

  • 67.
    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)
  • 68.
    Arnaud, Gayet
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry, Organic Chemistry.
    Christelle, Bolea
    Pher G., Andersson
    Development of new camphor based N,S chiral ligands and their application in transfer hydrogenation2004In: Organic & Biomolecular Chemistry, ISSN 1477-0520, Vol. 2, no 13, p. 1887-1893Article in journal (Refereed)
  • 69.
    Arnaud, Gayet
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry, Organic Chemistry.
    Sophie, Bertilsson
    Pher G., Andersson
    Novel Catalytic Kinetic Resolution Of Racemic Epoxides to Allylic alcohols2002In: Organic Letters, ISSN 1523-7060, Vol. 4, no 22, p. 3777-3779Article in journal (Refereed)
  • 70.
    Arvidsson P., Frackenpohl J., Ryder N., Liechty B., Petersen F., Zimmermann H., Camenisch G., Woessner R., Seebach D.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    On the antimicrobial and hemolytic activities of amphiphilic B-peptides.2001In: ChemBioChem, no 2(10), p. 771-773Article in journal (Refereed)
  • 71.
    Arvidsson P., Ruepling M., Seebach D.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Design, machine synthesis, and NMR-solution structure of a B-heptapeptide forming a saltbridge stabilized 314-helix in methanol and in water2001In: Chemical Communications (Cambridge, U K), p. 649-650Article in journal (Refereed)
  • 72.
    Arvidsson, Per
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Frackenpohl, J
    Seebach, D
    Syntheses an CD-Spectroscopic Investigations of Longer-Chain B-Peptides: Preparation by Solid-Phase Couplings of Single Amino Acids, Dipeptides, and Tripeptides2003In: Helvetica Chemica Acta, no 86, p. 1552-1553Article in journal (Refereed)
  • 73.
    Arvidsson, Per
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry II.
    Ryder, N
    Weiss, M
    Gross, G
    Kretz, O
    Woessner, R
    Seebach, D
    Antibiotic and Hemolytic Activity of a B2/B3 Peptide Capable of Folding into a 12/10-Helical Secondary Structure2003In: ChemBioChem, no 4, p. 1345-1347Article in journal (Refereed)
  • 74.
    Arvidsson, Per
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I. Organisk kemi.
    Ryder, Neil S.
    Weiss, H. Markus
    Hook, David F.
    Escalante, Jaime
    Seebach, Dieter
    Exploring the Antibacterial and Hemolytic Activity of Shorter- and Longer-Chain B-, a,B-, and y-Peptides, and of B-Peptides from B2-3-Aza- and B3-2-Methylidene-amino Acids Bearing Proteinogenic Side Chains - A Survey2005In: Chemistry & Biodiversity, Vol. 2, p. 401-420Article in journal (Refereed)
    Abstract [en]

    The antibacterial activities of 31 different b-, mixed a/B-, and y-peptides, as well as of B-peptides derived from B2-3-aza- and B3-2-methylidene-amino acids were assayed against six pathogens (Enterococcus faecails, STaphylococcus aureus, Streptococcus pneumoniae, Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa), and the results were compared with literature data. The interaction of these peptides with mammalian cells, as modeled by measuring the hemolysis of human erythrocytes, was also investigated. In addition to those peptides designed to fold into amphiphilic helical conformations with positive charges on one face of the helix, one new peptide with hemolytic activity was detected within the sample set. Moreover, it was demontrated that neither cationic peptides used for membrane translocation (B3-oligoarginines), nor mixeda/B- or y-peptides with somatostatin-mimicking activities display unwanted hemolytic activity.

  • 75. AUNE, M
    et al.
    BERGSON, G
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    MATSSON, O
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    1,3-HYDRON TRANSFER IN SOME 5-SUBSTITUTED AND 7-SUBSTITUTED 1-METHYLINDENES - ENANTIOSELECTIVITIES AND ENANTIOMER-DEPENDENT KINETIC ISOTOPE EFFECTS1995In: JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, ISSN 0894-3230, Vol. 8, no 6, p. 400-406Article in journal (Refereed)
    Abstract [en]

    Base-catalysed substrate-enantioselective 1,3-hydron transfer (kinetic resolution) was studied in the indene system. A series of 1-methylindenes substituted in the aromatic ring [5-methoxy- (2), 5-fluoro- (3), 5-nitro- (4) and 7-nitro (5)] and 1-methylindene (1) were employed as substrates. The rate constants, the enantioselectivities and the kinetic isotope effects (KIEs) for the enantioselective reactions [(k(H)/k(D))(+) and (k(H)/k(D))(-)] were determined at 20 degrees C using (+)-(8R, 9S)-dihydroquinidine as chiral catalyst in the solvent o-dichlorobenzene. The rate constants vary according to the electronic effects of the substituents, The primary deuterium KIE, ranging from 4 . 73 [for (+)-(S)-2] to 11 . 3 [for (-)-(R)-5], is correlated with the rate constants as expected on the basis of the Melander-Westheimer postulate, The introduction of a substituent in the aromatic ring decreases the enantioselectivity, All compounds except 5 show the same sense of the enantioselectivity [k(+)/k(-)>1; all substrates used are (+)-(S)/(-)-(R)], The enantiomer dependence of the KIE is most pronounced for 1 [(k(H)/k(D))(+) = 5 . 71 and (k(H)/k(D))(-) = 6 . 46] and vanishes for the most acidic substrates (4 and 5).

  • 76.
    Aune, Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Danielsson, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Hussenius, Anita
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Centre for Gender Research. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Ryberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Kristjansdottir, AG
    Uppsala University.
    Matsson, Olle
    Uppsala University.
    1,3-hydron transfer in some 5- or 7-substituted 1-methylindenes. Reaction rates and kinetic isotope effects1998In: Acta Chemica Scandinavica, ISSN 0904-213X, E-ISSN 1902-3103, Vol. 52, no 7, p. 911-920p. 911-920Article in journal (Refereed)
    Abstract [en]

    Rate constants and primary deuterium kinetic isotope effects (KIEs) have been determined for the base-catalysed 1,3-hydrotropic rearrangements of 1-methyl-5-nitroindene (12), 1-methyl-7-nitroindene (13), 5-methoxy-1-methylindene (14) and 5-fluoro-1-methy

  • 77.
    Aune, Marie
    et al.
    Uppsala University.
    Gogoll, Adolf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Matsson, Olle
    Uppsala University.
    Solvent Dependence of Enantioselectivity for a Base Catalyzed 1,3-Hydron Transfer Reaction: A Kinetic Isotope Effect and NMR Spectroscopic Study.1995In: Journal of Organic Chemistry, ISSN 0022-3263, E-ISSN 1520-6904, Vol. 60, no 5, p. 1356-1364p. 1356-1364Article in journal (Refereed)
    Abstract [en]

    The base-catalyzed rearrangement of 1-methylindene (1) to 3-methylindene (2) has been studied. The reaction proceeds with substrate enantioselectivity (kinetic resolution) when chiral tertiary amines are used as catalysts. When dihydroquinidine (DHQD) (3

  • 78.
    Axrup, L
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Markides, K
    Nilsson, T
    Using miniature diode array NIR spectrometers for analysing wood chips and bark samples in motion2000In: JOURNAL OF CHEMOMETRICS, ISSN 0886-9383, Vol. 14, no 5-6, p. 561-572Article in journal (Refereed)
    Abstract [en]

    The chemical and physical properties of the wood chips entering the Kraft pulping process are of high interest for many different reasons. The most important one is the possibility to establish an effective and dynamic forward process control. The same is

  • 79.
    Axén, Andreas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Bispidine derivatives as molecular tools for studies of (-Allyl)palladium complexes: Ligand synthesis and analythical cpplications1998Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Determination of structural and stereochemical features of reaction intermediates in transition metal catalysed reactions is of central interest. Bispidine derivatives as ligands in (π-allyl)palladium complexes in combination with 1H NMR spectroscopy are shown to be useful tools for revealing structural characteristics of these reaction intermediates. As a support for the conclusions drawn from NMR investigations, X-ray crystallography and calculated structures were used.

    Complexes of bispidine derivatives with varying substitution pattern and different pre-formed bis[(η3-allyl)palladium chloride] complexes were formed. The resulting complexes were analysed with 1H NMR spectroscopy, especially regarding the inter-ligand NOEs and the chemical shift effects due to anisotropic effects. It is shown that a large steric interaction between the aromatic systems of N,N'-diphenylated bispidine derivatives and various (π-allyl)palladium systems can be obtained. This steric interaction can be used for hindering rotation around C-C single bonds in (π-allyl)palladium ligands.

    Furthermore, the nearness of the aromatic systems and the (π-allyl)palladium ligand give rise to anisotropic effects that, after quantification, can give information about the structure in such complexes. The inter-ligand NOEs can, in the case of a N,N-diphenyl substituted bispidine derivative, be used for assignment of relative configuration in a set of acyclic (π-allyl)palladium ligands. With a bispidine derivative carrying chiral substituents, the inter-ligand NOEs were used for assignment of absolute configuration of (π-allyl)palladium ligands.

  • 80. BAKKER, ALBERT
    et al.
    GEJJI, SHRIDHAR
    LINDGREN, JAN
    HERMANSSON, KERSTI
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    PROBST, MICHAEL M
    CONTACT ION-PAIR FORMATION AND ETHER OXYGEN COORDINATION IN THE POLYMER ELECTROLYTES M[N(CF3SO2)(2)](2)PEO(N) FOR M=MG, CA, SR AND BA1995In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 36, no 23, p. 4371-4378Article in journal (Refereed)
    Abstract [en]

    The polymer electrolytes M[N(CF3SO2)(2)](2)PEO(n) for M = Mg, Ca, Sr and Ba have been investigated using infra-red spectroscopy, differential scanning calorimetry and impedance spectroscopy. The effects of varying concentration (n = 6-40) and temperature (25-95 degrees C) on the contact ion pair formation and cation coordination have been studied. Contact ion pairs are only found for the most concentrated samples (n < 9). Ion pairs occur with two types of structures: one type is found far samples containing Mg2+ and the other for samples with Ca2+, Sr2+ and Ba2+. The conductivities of the samples are discussed in terms of radii and coordination numbers of the cations.

  • 81. Bakker, Albert
    et al.
    Lindgren, Jan
    Hermansson, Kersti
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Polymer electrolytes based on triblock-copoly(oxyethylene/oxypropylene/oxyethylene) systems1996In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 37, no 10, p. 1871-1878Article in journal (Refereed)
    Abstract [en]

    Polymer electrolytes based on triblock copolymers of ethylene oxide (EO)/propylene oxide (PO)/ethylene oxide of moderate molecular weight and narrow block-length distributions, doped with M(CF3SO3)(2) and M[N(CF3SO2)(2)](2) (M = Mg, Ca, Sr and Ba), LiCF3SO3 and LiN(CF3SO2)(2) have been investigated using infrared spectroscopy, differential scanning calorimetry and conductivity measurements. The effects of varying the EO/PO block length, composition and temperature on the phase behaviour, ion-pair formation and conductivity of the polymer electrolytes have been studied. A two-phase microstructure has been observed. Ion pairing occurs for the triflate salts and the amount was found to be sensitive to the relative block sizes rather than the molecular weight of the copolymer. Copyright (C) 1996 Elsevier Science Ltd.

  • 82.
    Baltzer, Lars
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry II.
    DeGrado, W. F.
    Engineering and design: Expanding the protein world2004In: Editorial overview Current Opinion of Structural Biology, Vol. 14, p. 455-457Article, review/survey (Other (popular scientific, debate etc.))
  • 83. Barnidge, David
    et al.
    Nilsson, Stefan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Markides, Karin
    A design for low-flow sheathless electrospray emitters1999In: Analytical Chemistry, ISSN 0003-2700, Vol. 71, no 19, p. 4115-4118Article in journal (Refereed)
  • 84. Barnidge, David
    et al.
    Nilsson, Stefan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Rapp, Håkan
    Hjort, Klas
    Markides, Karin
    Metallized sheathless electrospray emitters for use in capillary electrophoresis orthogonal time-of-flight mass spectrometry1999In: Rapid Communications in Mass Spectrometry, ISSN 0951-4198, Vol. 13, no 11, p. 994-1002Article in journal (Refereed)
  • 85.
    Barnidge, DR
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Nilsson, S
    Markides, KE
    A design for low-flow sheathless electrospray emitters1999In: ANALYTICAL CHEMISTRY, ISSN 0003-2700, Vol. 71, no 19, p. 4115-4118Article in journal (Refereed)
    Abstract [en]

    An extremely simple design has been developed for producing durable sheathless electrospray emitters that give highly stable electrospray for unlimited lifetimes. The emitters can be fashioned from any style fused-silica capillary and are ideally suited

  • 86.
    Barnidge, DR
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Nilsson, S
    Markides, KE
    Rapp, H
    Hjort, K
    Metallized sheathless electrospray emitters for use in capillary electrophoresis orthogonal time-of-flight mass spectrometry1999In: RAPID COMMUNICATIONS IN MASS SPECTROMETRY, ISSN 0951-4198, Vol. 13, no 11, p. 994-1002Article in journal (Refereed)
    Abstract [en]

    Chromiun-gold coated fused silica emitters for electrospray ionization have been fabricated with lifetimes upwards of 100 hours. The coating on these emitters is extremely durable withstanding electrical discharges, abrasion and mechanical stress, Usable

  • 87.
    Baudin, Micael
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    Dynamics of metal oxides surfaces and the connection to reactivity2000Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Many interesting chemical and physical phenomena which take place on surfaces of metaloxides rely on the material's ability to repeatedly alter the electronic surface structure. Formost metal oxides this functionality is connected to the degree of non-stoichiometry andthe presence of structural defects. In many catalytic applications, for example, the metaloxide surfaces display optimal performance at rather high temperatures, and it is thereforeessential to include thermal distortions in any investigation of the mechanisms behind thefunctionality. It can be expected that dynamical changes in the surface structure will drastically alter the electronic structure, and thereby also the catalytic characteristics of thesurface.

    For metal oxide surfaces, experimental as well as theoretical data on surface dynamics(at non-zero temperatures) are virtually non-existent. The very few MD simulation studiesthat exist in the literature have exclusively dealt with the effect of temperature on stability,structure and ordering.

    This thesis describes molecular dynamics simulations and subsequent quantum-chemicalcalculations of metal oxide surfaces, and how the surface properties vary with temperature,crystal face and depth from the surface for three structurally different materials. The surfaces studied are the low-index faces of MgO, α-Al2O3(0001), undoped and dopedlow-index CeO2 surfaces, and the α-Al2O3(0001,010)/CeO2(011,011) interface. The emphasis lieson dynamic quantities, and the ionic motion is analysed in terms of mean-square displacements, ion migrations, instantaneous ionic displacements, as well as vibrational densities-of-states. Other properties discussed include surface energies, interplanar relaxations, and pairdistribution functions. The thesis also discusses the implication of short-time atomic-leveldynamical changes on reactivity.

  • 88. Baudin, Micael
    et al.
    Wojcik, Mark
    Hermansson, Kersti
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    A molecular dynamics study of MgO(111) slabs1997In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 375, no 2-3, p. 374-384Article in journal (Refereed)
    Abstract [en]

    Constant stress - constant temperature molecular dynamics simulations are reported for 30 Angstrom thick crystalline MgO (111) slabs with 2-D periodicity in the temperature range 10-1100 K. The 10 K run was 3.75 ps, the 300 K run was 41.25 ps while the others were 11.25 ps. The shell-model potential was used and the long-range interaction was taken into account with the 2-D Ewald summation technique. Two different models have been used in order to achieve the necessary charge compensation for the polar (111) surface. The relaxation of the surface structure and its temperature dependence have been investigated and compared with bulk MgO. The average coordination number in the surface layer and the surface energy are presented. The dynamics in the slab system is presented in terms of atomic mean-square displacements and vibrational density-of-states curves as a function of depth from the surface. (C) 1997 Elsevier Science B.V.

  • 89. Bazoti, Fotini N.
    et al.
    Tsarbopoulos, Anthony
    Markides, Karin E.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Analytisk kemi.
    Bergquist, Jonas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Analytisk kemi.
    Study of the non-covalent interaction between amyloid-b-peptide and melatonin using electrospray ionization mass spectrometry2005In: Journal of Mass Spectrometry, no 40, p. 182-192Article in journal (Refereed)
    Abstract [en]

    Oxidative stress and unregulated immune response are believed to play a key role in the processes inherent to Alzheimer's disease (AD). The fact that free radicals can result in neurodegeneration suggests that actions against reactive oxygen species may be beneficial in treating and preventing AD. In the light of the suggested link between oxidative stress and AD, it is proposed that antioxidants and, even more, endogenous antioxidants may offer a therapeutic regime for protection against the risk of this disease. For this reason, the formation of non-covalent complexes between amyloid-b-peptide (Ab) or its oxidized forms and melatonin was studied by quadrupole and Fourier transform ion cyclotron resonance electrospray ionization mass spectrometry. The stability of the non-covalent complex was examined under several experimental conditions, such as orifice voltage, pH, presence of organic modifier, concentration and time. Two different digestion protocols combined with mass spectrometric analysis of the resulting peptide fragments were employed in order to locate the binding site of melatonin in Ab.

  • 90. Bedekar, Ashutosh V.
    et al.
    Andersson, Pher
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    A New Class of Bis-Oxazoline Ligands for the Cu-Catalysed Asymmetric Cyclopropanation of Olefins1996In: Tetrahedron Letters, Vol. 37, no 23, p. 4073-4076Article in journal (Refereed)
  • 91. Bedekar, Ashutosh V.
    et al.
    Koroleva, Elise B.
    Andersson, Pher
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry I.
    Investigation of the Effects of the Structure and Chelate Size of Bis-oxazoline Ligands in the Asymmetric Copper-Catalyzed Cyclopropanation of Olefins: Design of a New Class of Ligands1997In: J. Org. Chem., no 62, p. 2518-2526Article in journal (Refereed)
  • 92. Beletskaya, I.P
    et al.
    Bregadze, V.I.
    Ivushkin, V.A.
    Petrovskii, P.V.
    Sivaev, I.B.
    Sjöberg, Stefan
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Biochemistry and Organic Chemistry, Organic Chemistry II. Organisk kemi.
    Zhigareva, G.B.
    New B-substituted derivatives of m-carborane, p-carborane, and cobalt bis(1,2-decarbollide) anion2004In: J. Organomet. Chem., no 689, p. 2920-Article in journal (Refereed)
  • 93.
    Berg, Helena
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry.
    The rational design of lithium insertion materials for battery applications1999Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The transition-metal oxide spine1 LiMn2O4 is a promising cathode material for high-capacity lithium-ion batteries. Structure-property relationships pertaining to the electrochemical cycling behaviour of LiMn2O4 have been studied. The techniques exploited have been in situ X-ray and neutron diffraction, in combination with quantum-mechanical band-structure calculations. The results obtained lay the ground for an improved basis for designing new insertion materials.

    Substitution of Mn by Ni in LiMn2O4 and by Li in Li1+xMn2-xO4 give qualitatively different results: Ni is found to replace Mn directly, while Li takes up entirely new sites not observed earlier. Band-structure calculations have been used to better understand the crystallographically observed x-dependence of the Li1+xMn2-xO4 structure, and the underlying mechanisms of lithium-ion extraction/insertion.

    Quantitative observation of charge passed through the cell has also been related to the amount of lithium extracted to indicate possible sources of irreversible capacity loss, and how synthesis technique can influence cell performance.

    The LiMn2O4 structure has also been studied by neutron diffraction after treatment in strong-acid solutions, where Li ® H ion-exchange has been observed to take place. This process has strong implications for the dissolution of Mn2+ ions from the cathode into the electrolyte, especially at elevated temperatures, and the related corrosion process occurring at the cathode surface.

  • 94.
    Bergens, Arne
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
    Determination of Aromatic Amines and Nitro Compounds by Voltammetry and Amperometric Detection in Liquid Chromatography1991Licentiate thesis, monograph (Other academic)
  • 95.
    Berger, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Bucur, RV
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Potentiometric measurements of copper diffusion in polycrystalline chalcocite, chalcopyrite and bornite1996In: Solid State Ionics, Vol. 89, p. 269-278Article in journal (Refereed)
    Abstract [en]

    Diffusion measurements have been performed by an electrochemical potentiometric method on polycrystalline synthetic chalcocite (Cu2S), chalcopyrite (CuFeS2) and bornite (Cu5FeS4) in the temperature range 5-50 degrees C. The chemical ((D) over tilde) diffusion coefficients are as follows: chalcocite 38.7 exp(-5600/T); chalcopyrite 15.4 exp(-6000/T) and bornite 14.5 exp(-4900/T).

  • 96.
    Berger, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Noren, L
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    On the stoichiometry, space group and polymorphism of TlCu7S41996In: J Alloys Compd, Vol. 237, p. 33-38Article in journal (Refereed)
    Abstract [en]

    The alleged necessity of changing the space group assignment of T1Cu(7)S(4) has been refuted on the basis of room-temperature neutron powder-diffraction data. The structure conforms well to I4/m, previously also found for the corresponding ternary selenide.

  • 97.
    Berger, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Tergenius, Lars-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Room temperature synthesis and structural characterization of monoclinic LiCuO2 by X-ray and neutron diffraction1994In: J Alloys Comp, Vol. 203, p. 203-207Article in journal (Refereed)
    Abstract [en]

    LiCuO2 was synthesized at room temperature by delithiation of Li2CuO2 using bromine in acetonitrile. The product shows broad diffraction lines which were analysed by the Rietveld refinement technique on X-ray and neutron powder data. The phase conforms to the NaCuO2 structure type

  • 98.
    BERGER, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    TERGENIUS, LE
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    NOREN, L
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    ERIKSSON, L
    THE CRYSTAL STRUCTURE OF ROOM-TEMPERATURE SYNTHESIZED ORTHORHOMBIC TLCU4SE3 FROM DIRECT-METHODS ON X-RAY-POWDER DATA1995In: J Alloys Comp, Vol. 224, p. 171-176Article in journal (Refereed)
    Abstract [en]

    An orthorhombic modification of TlCu4Se3 was synthesised at room temperature by oxidative copper extraction from TlCu5Se3. It crystallises in a new structure type, space group Pnnm, with the cell parameters a = 12.4306(2) Angstrom, b = 12.7997(2) Angstrom, c= 3.93516(6) Angstrom. The structure is closely related to the tetragonal structure of the parent compound.

  • 99.
    Berger, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Önnerud, P
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Laligant, Y
    Le Bail, A
    The structure of Li3Cu2O4, a compound with formal mixed valence1993In: J Alloys Comp, Vol. 190, p. 295-299Article in journal (Refereed)
    Abstract [en]

    The structure of Li3Cu2O4 was solved from X-ray powder diffraction data and refined from a multiphase specimen using the Rietveld method. The cuprate crystallizes in C2/m with Z=2. The compound has a small homogeneity range. Typical parameters are a= 9.946(5) Angstrom, b= 2.778(2) Angstrom, c= 7.260(5) Angstrom and beta= 119.10(2) degrees. The structure may be described as an ordered intergrowth of slabs of Li2CuO2 and hypothetical LiCuO2 of NaCuO2 type. The formula suggests a copper (II,III) mixture, but there is only one crystallographic copper site

  • 100.
    Berger, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Önnerud, P
    Tellgren, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Oorganisk kemi.
    Structure refinements of LiCu2O2 and LiCu3O3 from neutron powder diffraction data1992In: Journal of Alloys and Compounds, Vol. 184, p. 315-322Article in journal (Refereed)
    Abstract [en]

    In its inherent ability to discern light elements in a heavy-atom matrix, neutron powder diffraction has been used at room temperature to confirm structure hypotheses of LiCu2O2 and LiCu3O3, inferred from previous X-ray diffraction studies.

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