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Abstract
AbstractThe kinetics of base hydrolysis ofthecis‐(chloro)‐(benzimidazole)bis(ethylenediamine) cobalt(III) ion was investigated in Methanol‐water and Ethyleneglycol‐water media of varying compositions and at isodielectric conditions(Ds ≃ 61 at 25°C) in isopropanol‐ and Acetonitrile‐water media at 35°C in the pH range, 7.2–8.9. It is of interesttonote that the aquation rate constant of the conjugate base, cis‐[Co(en)2(bzm)Cl]+ (Bzm = N H deprotonated benzimidazole, en = ethylenediamine) is virtually insensitive to the compositions of the mixed solvents studied, unlike the aquation rate constant of the conjugate acid form of the title complex. This is indicative of a true dissociative mode of activation (Dcb) of the conjugate base.
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