Kinetic of base hydrolysis of some (aminomonocarboxylato)bis(ethylenediamine)/(trimethylenediamine) CoIII complexes in aqueous medium

P.G. Department of Chemistry, Ravenshaw University, Cuttack-753 003, Orissa, India P.G. Department of Chemistry, Utkal University, Bhubaneswar-751 004, Orissa, India Manuscript received 18 August 2005, revised 19 November 2007, accepted 26 November 2007 cis-[(en)2Co(O2CCH2NH3)2]3+, cis-[(en)2Co(β-O2(CH2)2NH3)2]3+ and trans-[(tmd)2Co(O2CCH2NH2)2]3+ were synthesized. The base hydrolysis of these complexes proceed through a two step mechanism. (AA)2 COX3+2 +OH- \(\frac{K^{fast}_{OH}}\_\) (AA)2 CO(X)OH2+ + X- (AA)2 Co(X)OH2+ +OH- \(\frac{K^{show}_{OH}}\_\) (AA)2 Co(X)(OH)+2 + X- A Dcb mechanism has been proposed for the reaction