Quantum-Chemical Simulation of Tetra-, Penta-, and Hexacoordinated Stereoisomers of Bis-Ligand Ni(II) Complexes based on Polydentate Heterocyclic Derivatives of Azomethines

Abstract

Molecular structures and relative energies of tetra-, penta-, and hexacoordinated stereoisomers of bis-ligand Ni(II) complexes based on polydentate heterocyclic derivatives of azomethines [coordination nodes of isomers NiN₂O₂, NiN₂O₂Y, NiN₂O₂Y₂ (Y = S, Se)] were calculated using density functional theory. Within the framework of the proposed quantum chemical model of the mechanism of formation of NiL₂ complexes (taking into account the possibility of subsequent stereoisomerization) the most probable product of complex formation was found to be the isomer with pentacoordinated central metal atom and nonequivalent ligands, tridentate and bidentate.