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• W2088941006 abstract "The electrochemical behavior of the hexaarylbiimidazole derived from 2-(2-chlorophenyl)-4,5-diphenylimidazole (o-Cl-HABI or L2) has been studied in acetonitrile. Reduction proceeds in an overall two-electron process that is presumed to occur by an ECE process in which the initially formed radical anion L−·2 undergoes a fast cleavage reaction to give the corresponding anion of the triarylimidazole L− and the triarylimidazoyl radical L·, which is subsequently reduced to the anion. The purported radical anion intermediate could not be detected by fast-scan (104 V s−1) cyclic voltammetry, putting a lower limit of 4 × 104 s−1 on the rate constant for the cleavage reaction. The product of controlled-potential reduction was L−. On the positive-going sweep of a cyclic voltammogram of L2, the L− that was formed at the main cathodic peak is oxidized to L· that dimerizes to form the original o-Cl-HABI with a dimerization rate constant of 1.1 × 104 M−1s−1 at 298 K. The reversible potential for the L·L− couple was found to be −0.15 V vs. the ferrocene/ferrocenium potential. Analysis of the voltammetric data from 0.02 to 10 V s−1 allowed the establishment of limits for the parameters of the ECE reaction. Namely, the reversible potential for the L2L−·2 couple falls between −1.83 and −1.91 V vs. ferrocene, the standard heterogeneous electron transfer rate constant lies between 0.03 and 0.2 cm s−1 and the rate constant for cleavage of L−·2 falls in the range from 4 × 104 to 1 × 107 s−1." @default.
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• W2088941006 date "1996-02-01" @default.
• W2088941006 modified "2023-10-16" @default.
• W2088941006 title "Electrochemical studies of a hexaarylbiimidazole" @default.
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• W2088941006 doi "https://doi.org/10.1016/0022-0728(95)04317-9" @default.
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