Complexes of Copper(II) with 2‐(N‐Salicylideneamino)‐ 3‐carboxyethyl‐4,5,6,7‐tetrahydrobenzo[b]thiophene Containing Different Counter Anions

Abstract

Condensation of 2‐amino‐3‐carboxyethyl‐4,5,6,7‐tetrahydrobenzo[b]thiophene with salicylaldehyde yielded a potentially tridentate Schiff base (HSAT), which formed a series of copper(II) complexes of the type[Cu(SAT)X] in presence of different coordinating anions (X) such as chloride, bromide, nitrate, perchlorate, acetate or sulphate. These complexes were characterized through elemental analytical, molar conductance, magnetic susceptibility, UV‐Visible, IR, and EPR spectral data. The spectral studies reveal that the ligand moiety is bonded to the metal ion through the deprotonated phenolate oxygen, azomethine nitrogen and ester carbonyl group. The EPR spectral data showed that the metal‐ligand bonds have considerable covalent character. X‐ray diffraction study of [Cu(SAT)OAc] indicated that the complex has an orthorhombic crystal lattice. The nitrato complex has undergone facile transesterification reaction when refluxed in methanol for lengthy period. The ligand as well as the metal complexes have been screened for their antimicrobial activity and effect of co‐ligand on the antibacterial property has also been discussed.