Copper(II) complexes of tridentate SNO ligands: synthesis, characterization and crystal structure

Abstract

A new series of binary copper(II) complexes, [Cu(L)₂] (2) [where L is a monobasic tridentate methylthioazophenolate having NSO donor sets], has been synthesized. The reddish brown colored complexes have been characterized by elemental analyses, spectroscopic and other physico-chemical tools. The detailed structure analysis of one of the complexes, [Cu(1a)₂] (2a), by single-crystal X-ray crystallography shows that thioether-S donor center participates in coordination with the copper(II) ion with a weak interaction with long Cu–S(thioether) bond distances [2.956(2) Å and 2.925(2) Å]. Electrochemical study of the complexes in methanol using TBAP as supporting electrolyte shows that heterogeneous electron-transfer rate is low at the applied potential.

Keywords:

• Binary copper(II) complex
• SNO ligands
• Crystal structure

Acknowledgements

The financial assistance from the Council of Scientific and Industrial Research (CSIR), New Delhi, is gratefully acknowledged. We are indebted to Prof. A.R. Chakravarty, Department of Inorganic and Physical Chemistry, IISc, Bangalore, for his valuable suggestion.