Kinetics and Mechanism of Nucleophilic Substitution in an Acido-Pentammine-Cobalt(III) Complex in Aqueous Solution
A considerable amount of controversy appears to exist in the literature (1) regarding the mechanism of base hydrolysis of acido-pentammine-cobalt(III) complexes. Detailed investigations on the kinetics of base hydrolysis of several complexes of this type, [Co(NH3)5X]2+, where X = Cl-, Br- or N-, have been reported by earlier investigators (2–4). It is known (5) that in [Co(NH3)5(S>2O3)]+ the thiosulphate is so firmly bound that on treating with potassium cyanide all the ammonia are displaced leading to the formation of [Co(CN)5(S2O3)]4-.
KeywordsIonic Strength Ammonium Nitrate Nucleophilic Substitution Order Rate Constant Early Investigator
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