Enthalpies of ligand exchange for the complexes [(NH3)5Co-L]3+ (L = water, dimethyl sulfoxide, N,N-dimethylformamide, and pyridine)

Abstract

The enthalpies of ligand exchange for monosubstituted complexes of pentaamminecobalt (III) have been determined by using solution calorimetry in the solid phase and in aqueous solution. It is found that stabilities toward ligand exchange for the compounds [(NH 3 ) 5 Co−L] 3+ increase in the following order: L=DMSO<water<N,N-DMF<pyridine=ammonia