Synthesis of copper (II) complexes incorporating N,N-dimethyl-N′-benzylethylenediamine and NCX (X=O, S and Se) ligands: A combined crystallographic, spectroscopic and DFT study
摘要:
Three copper (II) complexes of type [Cu(L)(2)(NCX)]ClO4, 13, (L = N,N-dimethyl,N'-benzyl-1,2-diaminoethane and X = O, S and Se) were synthesized and characterized on the basis of microanalytical, spectroscopic and molar conductance. An X-ray diffraction study of [Cu(L)(2)(NCO)]ClO4 (1) reveals that the copper (II) center located in a distorted square pyramidal environment through coordination of four amine N atoms and a N atom of the terminal NCO-. Density functional theory (DFT) calculations were performed to understand the linkage isomerism of NCX- ligand from a theoretical point of view, to study the electronic structure of the complexes and the relative stabilities of the CuNCX/CuXCN isomers. DFT computational results buttressed the experimental observations indicating that the CuNCX isomer is more stable than CuXCN linkage isomer. Complexes 1 and 2 exhibit solvatochromism as evidenced from visible study in different solvents. (C) 2012 Elsevier Ltd. All rights reserved.