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  • 1
    Digitale Medien
    Digitale Medien
    Evidence for Orbital Symmetry Restrictions in Intramolecular Dissociative Electron Transfer (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 8285-8286 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00136a033
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  • 2
    Digitale Medien
    Digitale Medien
    LIGA-electrodes in voltammetric and spectroelectrochemical studies (2000)
    Springer
    Fresenius' journal of analytical chemistry 367 (2000), S. 314-319 
    Details
    ISSN: 1432-1130
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The advantages of lithographic-galvanic (LIGA) fabricated microstructured honeycomb electrodes are demonstrated for spectroelectrochemical cells with respect to the response time (the time necessary to generate the product in a sufficient layer thickness close to the electrode to be detectable by UV-Vis-NIR spectroscopy) and to the conversion of the redox system in solution under thin-layer conditions. Transmission UV-Vis-NIR spectroscopy for several electrochemical applications can be performed in a special spectroelectrochemical cell based on the LIGA electrode and the two quartz rods, forming the walls of the cell and conducting the light beam through the cell. They are limiting the diffusion layer at the structured part of the working LIGA electrode. These microstructured LIGA-electrodes can be used as well defined models of porous electrodes at which redox processes occur under finite diffusion conditions. Such electrodes have been successfully used in the voltammetric and spectroelectrochemical study of various redox systems in both aqueous and non-aqueous solvents. The possibility to fabricate the well defined microstructures from various organic conducting polymers is demonstrated by the electrochemical deposition of polypyrrole in moulded LIGA-forms at high current densities in aqueous solutions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002160000418
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  • 3
    Digitale Medien
    Digitale Medien
    Carbon fiber microelectrodes modified with Nafion (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 255-259 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Nafion ; Carbon fiber ; Methylviologen ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Methods for coating cylindrical carbon fiber microelectrodes with Nafion films of different thickness have been developed. It has been shown that it is possible to form thicker Nafion layers on the microelectrodes by adding multiple coats. The charge required to oxidize methylviologen incorporated in Nafion films was used to estimate the average thickness of the Nafion films. The ion-exchange equilibrium between Nafion film and solution was established more rapidly on the microelectrodes by cylindrical diffusion in the solutions and thicker Nafion films. A procedure for the desorption of viologen and dissolution of Nafion films on microelectrodes has been developed. Their use resulted in regeneration of the microelectrodes before the application of new coatings of Nafion.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140070310
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  • 4
    Digitale Medien
    Digitale Medien
    One-Electron Oxidation of Aryltriazenes to Radical Cations (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 2423-2429 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Triazenes, aryl ; Radical cations ; Cyclic voltammetry ; ESR spectroscopy ; UV-Vis spectroelectrochemistry ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 3,3-Dimethyl-1-(4-R-phenyl)- [R = (CH3)2N, C2H5O, CH3O, CH3; 3] and 3-Methyl-1-(4-R1-phenyl)-3-(4-R2-phenyl)triazenes [R1 = (CH3)2N, CH3O, NO2, R2 = CH3O, H, 4] are oxidized electrochemically and chemically to their one-electron oxidation products. Cyclic voltammograms of the triazenes are discussed, and ESR as well as UV/Vis spectra of the radical cations are presented. The stability of the triazene radical cations generated depends on the substituents on the aryl rings. 4-R-Benzenediazonium ions are identified as one of the decay products of the radical cations by means of cyclic voltammetry and UV/Vis spectroelectrochemistry.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19941271213
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