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  • 1.
    Andersson, Claes-Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi, Fysikalisk-organisk kemi.
      Appendix: Experimental details for tricarbonyl chromium complexes2011Annet (Annet vitenskapelig)
  • 2.
    Andersson, Claes-Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi, Fysikalisk-organisk kemi.
    Chemistry of Carbon Nanostructures: Functionalization of Carbon Nanotubes and Synthesis of Organometallic Fullerene Derivatives2011Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis is based on two main parts. The first part concerns purification and functionalization of carbon nanotubes (papers I-III), and the second part is related to the synthesis of organometallic fullerene derivatives (papers IV-VII):

    Two oxidative methods involving aqueous nitric acid were compared with respect to their capability to introduce carboxylic groups into single walled carbon nanotubes, and several literature methods for esterification and amidation of these groups have been evaluated with focus on efficiency and reproducibility in forming covalently functionalized products soluble in organic media. Amidation proceeding via a SWNT-(COCl)n intermediate yielded the expected covalent product, whereas carboxylate salt formation dominated with other attempted methods. Esterification was achieved via the acyl chloride method and via alkylation of SWNT-(COO)n, the latter being the more efficient method.

    A new, reagent-free method for purification of single- and multi walled carbon nanotubes has been developed. Microwave treatment dissociates non-nanotube carbon and disperses it into an organic solvent, resulting in very pure carbon nanotubes within a few minutes of heating, without the involvement of acidic/oxidative reagents. According to thermogravimetric analysis, Raman and IR spectroscopy, as well as SEM, the process yields nanotubes with a low degree of defects.

    A non-covalent approach has been employed to prepare nanotubes functionalized with glycosides. Derivatives of galactose and lactose were covalently linked to a pyrene moiety and the thus formed pyrene-glycosides were non-covalently attached to single- and multi walled carbon nanotubes by π-π interactions. Fluorescence titrations have been used to quantify the formed supramolecular assemblies, which for SWNTs exhibits increased water solubility.

    A fulleropyrrolidine-(tricarbonyl)chromium complex was synthesized and fully characterized. IR spectroelectrochemistry was used to probe the redox state of the fullerene and provided evidence for electronic communication between the two electroacive moieties. A C60-ferrocene-C60 triad system was synthesized and characterized. Cyclic voltammetry and fluorescence studies suggested electronic communication between ferrocene and the two fullerenes. Finally, the synthesis and initial characterization of short fullerene-ferrocene oligomers are presented.

    Delarbeid
    1. Reproducibility and efficiency of carbon nanotube end-group generation and functionalization
    Åpne denne publikasjonen i ny fane eller vindu >>Reproducibility and efficiency of carbon nanotube end-group generation and functionalization
    2009 (engelsk)Inngår i: European Journal of Organic Chemistry, ISSN 1434-193X, E-ISSN 1099-0690, Vol. 26, s. 4421-4428Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    In a systematic fashion, several methods for esterification and  amidation of single-walled carbon nanotubes have been evaluated with   focus on efficiency and reproducibility in forming covalently   functionalized products soluble in organic media. The outcome of   transformations was determined using IR, Raman and NMR spectroscopy and   by thermogravimetric analysis (TGA). Amidation proceeding via a   SWNT-(COCl)(n) intermediate yielded the expected covalent product,  whereas carboxylate salt formation dominated with other attempted   methods. Esterification was achieved via the acyl chloride method and   via alkylation of SWNT-(COO-)(n), the latter being the more efficient   method. A non-covalent solubilizing interaction was obtained for RNH2   but not for ROH (R = octadecyl), proving that the most important   non-covalent interaction between oxidatively cleaned SWNTs and   octadecylamine is a salt formation. The outcome of the secondary   functionalization of carboxyl units is highly reproducible for   experiments carried out on the same batch of SWNT-(COOH)(n). Normalization of the outcome of the secondary functionalization to the   composition of the different batches of starting materials reveals an overall high reproducibility of the secondary function alizations. The   differences in outcome related to different commercial SWNT batches   from the same synthetic procedure is negligible compared to that   resulting from differences in overall carboxyl content after the   primary HNO3 oxidative cleaning step. Hence, the composition of   purified SWNT starting materials always needs to be assessed, in particular before drawing any conclusions concerning differences in   outcome from reaction systems involving different sources of SWNT  material.

    Emneord
    Nanotubes, Nanotechnology, Functionalization, Esterification, Amidation
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-112369 (URN)10.1002/ejoc.200900534 (DOI)000270014700006 ()
    Tilgjengelig fra: 2010-01-13 Laget: 2010-01-13 Sist oppdatert: 2017-12-12bibliografisk kontrollert
    2. The reagent-free, microwave-assisted purification of carbon nanotubes
    Åpne denne publikasjonen i ny fane eller vindu >>The reagent-free, microwave-assisted purification of carbon nanotubes
    Vise andre…
    2010 (engelsk)Inngår i: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 34, nr 10, s. 2275-2280Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    We have developed a microwave-assisted, reagent-free method for the efficient primary purification of MW and SW carbon nanotubes that is extremely fast compared to previously reported processes. The treatment dissociates and disperses non-nanotube carbon in an organic solvent to yield very pure carbon nanotubes within a few minutes of heating and a simple filtration, without the involvement of acidic/oxidative reagents. According to thermogravimetric analysis, Raman and IR spectroscopy, as well as scanning and transmission electron microscopy, the process yields pure nanotubes with a low degree of defects.

    HSV kategori
    Forskningsprogram
    Kemi med inriktning mot oorganisk kemi
    Identifikatorer
    urn:nbn:se:uu:diva-134674 (URN)10.1039/c0nj00087f (DOI)000282219600029 ()
    Tilgjengelig fra: 2010-12-01 Laget: 2010-11-30 Sist oppdatert: 2018-06-04bibliografisk kontrollert
    3. Reversible Non-Covalent Derivatisation of Carbon Nanotubes with Glycosides
    Åpne denne publikasjonen i ny fane eller vindu >>Reversible Non-Covalent Derivatisation of Carbon Nanotubes with Glycosides
    2009 (engelsk)Inngår i: Soft Matter, ISSN 1744-683X, Vol. 5, nr 14, s. 2713-2716Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    SWNTs and MWNTs have been non-covalently functionalized with glycosides   in a reversible manner, and fluorescence titrations have been used to   quantify the formed supramolecular assemblies which for SWNTs exhibits   increased water solubility.

    Emneord
    carbon nanotube
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-112366 (URN)10.1039/ B907791J (DOI)000268783500006 ()
    Tilgjengelig fra: 2010-01-13 Laget: 2010-01-13 Sist oppdatert: 2011-11-04bibliografisk kontrollert
    4. Synthesis and IR Spectroelectrochemical Studies of a [60]Fulleropyrrolidine-(tricarbonyl)chromium Complex: Probing C-60 Redox States by IR Spectroscopy
    Åpne denne publikasjonen i ny fane eller vindu >>Synthesis and IR Spectroelectrochemical Studies of a [60]Fulleropyrrolidine-(tricarbonyl)chromium Complex: Probing C-60 Redox States by IR Spectroscopy
    2011 (engelsk)Inngår i: European Journal of Inorganic Chemistry, ISSN 1434-1948, E-ISSN 1099-1948, nr 11, s. 1744-1749Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The synthesis of a new fulleropyrrolidine-(tricarbonyl)chromium complex: 1-methyl-2-(4-methoxyphenyl)-3,4-[60]fulleropyrrolidine-(tricarbonyl)chromium is described together with its characterization by IR, NMR and cyclic voltammetry. IR spectro-electrochemistry has been used to probe the redox level of the fullerene derivative via the relative position of the vibrational bands of the CO ligands, which are sensitive to the electronic state of the complex. Other strategies to incorporate a tricarbonylchromium moiety to fullerene C60 are also briefly discussed and evaluated.

    sted, utgiver, år, opplag, sider
    John Wiley & Sons, 2011
    Emneord
    Fullerenes, Chromium, IR spectroscopy, Cyclic voltammetry, Redox chemistry, Electrochemistry
    HSV kategori
    Forskningsprogram
    Kemi med inriktning mot organisk kemi
    Identifikatorer
    urn:nbn:se:uu:diva-148456 (URN)10.1002/ejic.201100011 (DOI)000289354900008 ()
    Tilgjengelig fra: 2011-03-07 Laget: 2011-03-07 Sist oppdatert: 2017-12-11
    5. Synthesis and characterization of a ferrocene-linked bis-fullerene[60] dumbbell
    Åpne denne publikasjonen i ny fane eller vindu >>Synthesis and characterization of a ferrocene-linked bis-fullerene[60] dumbbell
    2012 (engelsk)Inngår i: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 41, nr 8, s. 2374-2381Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    A new [60]fullerene dumbbell consisting of two fulleropyrrolidines connected to a central ferrocene unit by amide linkages has been prepared and fully characterized by elemental analysis, 1H NMR, UV/Vis, fluorescence and mass spectrometry. The electrochemical properties as determined by cyclic voltammetry show ground state electronic communication between the ferrocene and the fullerene units. In addition, the preparaton of a ferrocene building block for an alternative linking approach is presented.

    Emneord
    Fullerenes, Ferrocene, Dumbbell, Cyclic voltammetry
    HSV kategori
    Forskningsprogram
    Kemi med inriktning mot organisk kemi; Kemi med inriktning mot oorganisk kemi
    Identifikatorer
    urn:nbn:se:uu:diva-158905 (URN)10.1039/C2DT12097F (DOI)000300186100022 ()
    Tilgjengelig fra: 2011-09-19 Laget: 2011-09-19 Sist oppdatert: 2017-12-08bibliografisk kontrollert
    6. Short ferrocene-[60]fulleropyrrolidine oligomers. A preliminary account on synthetic studies
    Åpne denne publikasjonen i ny fane eller vindu >>Short ferrocene-[60]fulleropyrrolidine oligomers. A preliminary account on synthetic studies
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    A synthetic strategy towards short fullerene based organometallic oligomers is reported. The synthetic approach is based on the secondary functionalization of N-unsubstituted fulleropyrrolidines with ferrocene dicarboxylic acid chloride. Preliminary characterization by mass spectrometry, UV/Vis and NMR suggest a trimer or tetramer structure.

    Emneord
    Fullerenes / Oligomers / Ferrocene
    HSV kategori
    Forskningsprogram
    Organisk kemi
    Identifikatorer
    urn:nbn:se:uu:diva-159308 (URN)
    Merknad
    preliminärt manuskriptTilgjengelig fra: 2011-09-27 Laget: 2011-09-27 Sist oppdatert: 2011-11-04
    7.   Appendix: Experimental details for tricarbonyl chromium complexes
    Åpne denne publikasjonen i ny fane eller vindu >>  Appendix: Experimental details for tricarbonyl chromium complexes
    2011 (engelsk)Annet (Annet vitenskapelig)
    sted, utgiver, år, sider
    Uppsala: Acta Universitatis Upsaliensis, 2011
    HSV kategori
    Forskningsprogram
    Kemi med inriktning mot organisk kemi
    Identifikatorer
    urn:nbn:se:uu:diva-159309 (URN)
    Tilgjengelig fra: 2011-09-27 Laget: 2011-09-27 Sist oppdatert: 2011-11-04
  • 3.
    Andersson, Claes-Henrik
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi, Fysikalisk-organisk kemi.
    Grennberg, Helena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi, Fysikalisk-organisk kemi.
    Short ferrocene-[60]fulleropyrrolidine oligomers. A preliminary account on synthetic studiesManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    A synthetic strategy towards short fullerene based organometallic oligomers is reported. The synthetic approach is based on the secondary functionalization of N-unsubstituted fulleropyrrolidines with ferrocene dicarboxylic acid chloride. Preliminary characterization by mass spectrometry, UV/Vis and NMR suggest a trimer or tetramer structure.

  • 4.
    Jafri, Hassan M.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Löfås, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Jonas, Fransson
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Blom, Tobias
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Grigoriev, Anton
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Wallner, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi, Fysikalisk-organisk kemi.
    Ahuja, Rajeev
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Ottosson, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Fysikalisk-organisk kemi.
    Leifer, Klaus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Identification of vibrational signatures from short chains of interlinked molecule-nanoparticle junctions obtained by inelastic electron tunnelling spectroscopy2013Inngår i: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 5, nr 11, s. 4673-4677Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Short chains containing a series of metal- molecule-nanoparticle nanojunctions are a nano-materials system with the potential to give electrical signatures close to those from single molecule experiments while enabling to build portable devices on a chip. Inelastic electron tunnelling spectroscopy (IETS) measurements provide one of the most characteristic electrical signals of single and few molecules. In interlinked molecule-nanoparticle (NP) chains containing of typically 5-7 molecules in a chain, the spectrum is expected to be a superposition of the vibrational signature of individual molecules. We have established a stable and reproducible molecule-AuNP multi-junction by placing few 1,8-octanedithiol (ODT) molecules into a versatile and portable nanoparticle-nanoelectrode platform and measured for the first time vibrational molecular signatures complex and coupled few-molecule-NP junctions. From quantum transport calculations, we model the IETS spectra and identify vibrational modes as well as the number of molecules contributing to the electron transport in the measured spectra.

  • 5.
    Wallner, Andreas
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi, Fysikalisk-organisk kemi.
    Jafri, S. Hassan M.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Blom, Tobias
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Gogoll, Adolf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi, Organisk kemi.
    Leifer, Klaus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Baumgartner, Judith
    Ottosson, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för biokemi och organisk kemi.
    Formation and NMR Spectroscopy of ω-Thiol Protected α,ω-Alkanedithiol Coated Gold Nanoparticles and Their Usage in Molecular Charge Transport Junctions2011Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 27, nr 14, s. 9057-9067Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gold nanoparticles (AuNPs) coated with stabilizing molecular monolayers are utilized in areas ranging from life sciences to nanoelectronics. Here we present a novel and facile one-pot single phase procedure for the preparation of stable AuNPs with good dispersity, which are coated with α,ω-alkanedithiols whose outer ω-thiol is protected by a triphenylmethyl group. Using dielectrophoresis we were able to trap these AuNPs, coated with ω-thiol protecting groups, in a 20 nm gold electrode nanogap. The ω-thiol group was then deprotected under acidic conditions in situ once the AuNPs were correctly positioned in the device. The subsequent deprotection resulted in an increase of conductance by three orders of magnitude, indicating that the isolated dithiol coated AuNPs were fused into a covalently bonded network with AuNP-molecule-AuNP as well as electrode-molecule-AuNP linkages. Furthermore, complete characterization of the AuNP surface-bonded alkanedithiols was achieved using a series of one- and two-dimensional NMR spectroscopy techniques. Our spectra of the molecule-coated AuNPs show well resolved signals, only slightly broader than for free molecules in solution, in contrast to many earlier reported NMR spectral data of molecules attached to AuNPs. Complementary diffusion NMR spectroscopic experiments were performed to prove that the observed alkanedithiols are definitely surface bonded species and do not exist in free and unattached form.

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