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• W2085166236 abstract "The effects of replacing H2O with D2O solvent upon the electrochemical kinetics of simple transition-metal redox couples containing aquo, ammine or ethylenediamine ligands have been investigated at mercury electrodes as a means of exploring the possible contribution of ligand-aqueous solvent interactions to the activation barrier to outer-sphere electron transfer. The general interpretation of solvent isotope effects upon electrode kinetics is discussed; it is concluded that double-layer corrected isotopic rate ratios (kH/kD)E determined at a constant electrode potential vs. an aqueous reference electrode, as well as those determined at the respective standard potentials in H2O and D2O (kSH/kSD), have particular significance since the solvent liquid-junction potential can be arranged to be essentially zero. For aquo redox couples, values of (kSH/kSD) were observed that are substantially greater than unity and appear to be at least partly due to a greater solvent-reorganization barrier in D2O arising from ligand-solvent hydrogen bonding. For ammine and ethylenediamine complexes values of (kH/kD)E substantially greater than, and smaller than, unity were observed upon the separate deuteration of the ligands and the surrounding solvent respectively. Comparison of isotope rate ratios for corresponding electrochemical and homogeneous outer-sphere reactions involving cationic ammine and aquo complexes yields values of (kH/kD) for the former processes that are typically markedly larger than those predicted by the Marcus model from the homogeneous rate ratios. These discrepancies appear to arise from differences in the solvent environments in the transition states for electrochemical and homogeneous reactions." @default.
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• W2085166236 date "1980-11-01" @default.
• W2085166236 modified "2023-10-02" @default.
• W2085166236 title "Solvent isotope effects upon the kinetics of some simple electrode reactions" @default.
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• W2085166236 doi "https://doi.org/10.1016/s0022-0728(80)80435-9" @default.
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