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• W2041323474 endingPage "7538" @default.
• W2041323474 startingPage "7529" @default.
• W2041323474 abstract "The dissociative reduction of a series of symmetrical (RSSR, R = H, Me, t-Bu, Ph) and unsymmetrical disulfides (RSSR', R = H, R' = Me and R = Ph, R' = Me, t-Bu) was studied theoretically, by MO ab initio calculations and, for five of them, also experimentally, by convolution voltammetry in N,N-dimethylformamide. The reduction is dissociative but proceeds by a stepwise mechanism entailing the formation of the radical anion species. The electrochemical data led to estimated large intrinsic barriers, in agreement with an unusually large structural modification undergone by the disulfide molecules upon electron transfer. The theoretical results refer to MP2/3-21G*//MP2/3-21G*, MP2/3-21*G*//MP2/3-21G*, CBS-4M, and G2(MP2), the latter approach being used only for the molecules of small molecular complexity. A loose radical-anion intermediate was localized and the dissociation pattern for the relevant bonds analyzed. For all compounds, the best fragmentation pathway in solution is cleavage of the S-S bond. In addition, S-S bond elongation is the major structural modification undergone by the disulfide molecule on its way to the radical anion and eventually to the fragmentation products. The calculated energy of activation for the initial electron transfer was estimated from the crossing of the energy profiles of the neutral molecule and its radical anion (in the form of Morse-like potentials) as a function of the S-S bond length coordinate. The inner intrinsic barrier obtained in this way is in good agreement with that determined by convolution voltammetry, once the solvent effect is taken into account." @default.
• W2041323474 created "2016-06-24" @default.
• W2041323474 creator A5031595587 @default.
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• W2041323474 creator A5061739253 @default.
• W2041323474 creator A5066999577 @default.
• W2041323474 creator A5076995076 @default.
• W2041323474 date "2002-05-31" @default.
• W2041323474 modified "2023-10-11" @default.
• W2041323474 title "Theoretical and Electrochemical Analysis of Dissociative Electron Transfers Proceeding through Formation of Loose Radical Anion Species: Reduction of Symmetrical and Unsymmetrical Disulfides" @default.
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• W2041323474 doi "https://doi.org/10.1021/ja012545e" @default.
• W2041323474 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12071763" @default.
• W2041323474 hasPublicationYear "2002" @default.
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