Effect of solvent on the reactions of coordination complexes: Part 15: Base hydrolysis ofCis-(Chloro)(benzimidazole)-Bis-(ethylenediamine)cobalt(III) ion in mixed solvent media

✍ Scribed by Anadi C. Dash; Neelamadhab Dash

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 390 KB
• Volume: 22
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550221203

✦ Synopsis

The kinetics of base hydrolysis of the cis-(chloro)-(benzimidazole)bis(ethylenediamine) cobalt(II1) 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 Acetonitrilewater media at 35°C in the pH range, 7.2-8.9. It is of interest to note that the aquation rate constant of the conjugate base, cis-[Co(en)z(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 (Deb) of the conjugate base.