Substitution reactions of ligand bridged dinuclear complexes of cobalt(III) and chromium(III)

This review encompasses the substitution reactions of various single and multiple bridged cobalt(III) and chromium(III) complexes. The reactions have been categorized with various bridging ligands, like oxo, peroxo, superoxo, hydroxo, cyano, carbonato, sulphato, amido etc. ligands. Reactions have usually been made in aqueous and basic media. In multiple bridged complexes, bridge cleavage generally takes place in a consecutive manner, although in a few cases simultaneous rupture of multiple bridges takes place. The nature of substitution depends both on the nature of substrate and also on the nature of the medium. In view of above observations, a review encompassing the substitutional activities of multinuclear cobalt(III) and chromium(III) complexes seems worth undertaking and an attempt to that direction have been taken up.