Crystallographic Distances Based Bond Valence Sum (BVS) Analysis on Nickel(II) Complexes Containing Ni-S and Ni-P Bonds

Abstract

Bond valence sum (BVS) analysis is used by many researchers to determine the oxidation state of metal ions in solids based on crystallographically determined metal-ligand bond distances. In this paper, bond valence sums (BVS) have been calculated for a series of mixed ligand complexes involving Nickel(II)dithiocarbamates and phosphorous donor ligands. The BVS values are calculated first time for the complexes whose crystal structures have been reported from our laboratory and a few others reported from other laboratories. The calculated values show that the BVS values are higher than the expected formal oxidation state of +2. The higher values observed in the complexes support the fact that the Ni-S, Ni-P bonds are more covalent and the back bonding effects are very highly pronounced.