Spectroscopy, Structure and Antimicrobial Activity of Copper Complex with Benzoic Acid Derivative Ligands

Abstract

A novel binuclear copper(II) complex, {[Cu(OCH₃)(PABA)₂]₂.CH₃OH where PABA is 4-aminobenzoic acid} has been synthesized and characterized by various techniques. Single crystal X-ray diffraction revealed that, both of the copper(II) ions have distorted octahedral geometry with the coordination of the PABA ligand. The copper(II) centres are separated by 2.6137(18) Å. Fourier transform infrared spectroscopy spectral studies were used to identify the functional groups. The ultraviolet visible spectra confirmed  → ^* of PABA and d-d transition of copper (II) ion at 284 and 715 nm respectively. The thermogravimetry analysis results showed the decomposition of the complex occurs in two steps. The antimicrobial activity was screened by minimal inhibitory concentration method. The metal complex was more affected on Gram-negative bacteria than Gram-positive bacteria.