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Título

Electron transfer to sulfides and disulfides: intrinsic barriers and relationship between heterogeneous and homogeneous electron-transfer kinetics

AutorMeneses, Ana Belén; Antonello, Sabrina; Arévalo, María Carmen; González Martín, Concepción C. ; Sharma, Jadab; Wallette, Andrea N.; Workentin, Mark S.; Maran, Flavio
Palabras claveElectrochemistry
Electron transfer
Reduction
Substituent effects
Sulfur
Fecha de publicación6-jul-2007
EditorJohn Wiley & Sons
CitaciónChemistry - A European Journal 13(28): 7983-7995 (2007)
ResumenThe electron-acceptor properties of series of related sulfides and disulfides were investigated in N,N-dimethylformamide with homogeneous (redox catalysis) and/or heterogeneous (cyclic voltammetry and convolution analysis) electrochemical techniques. The electron-transfer rate constants were determined as a function of the reaction free energy and the corresponding intrinsic barriers were determined. The dependence of relevant thermodynamic and kinetic parameters on substituents was assessed. The kinetic data were also analyzed in relation to corresponding data pertaining to reduction of diaryl disulfides. All investigated reductions take place by stepwise dissociative electron transfer (DET) which causes cleavage of the C(alkyl)-S or S-S bond. A generalized picture of how the intrinsic electron-transfer barrier depends on molecular features, ring substituents, and the presence of spacers between the frangible bond and aromatic groups was established. The reduction mechanism was found to undergo a progressive (and now predictable) transition between common stepwise DET and DET proceeding through formation of loose radical anions. The intrinsic barriers were compared with available results for ET to several classes of dissociative- and nondissociative-type acceptors, and this led to verification that the heterogeneous and the homogeneous data correlate as predicted by the Hush theory.
Descripción13 pages, 7 figures, 5 tables.-- PMID: 17616962 [PubMed].
Versión del editorhttp://dx.doi.org/10.1002/chem.200700382
URIhttp://hdl.handle.net/10261/12695
DOI10.1002/chem.200700382
ISSN0947-6539
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