Microwave assisted synthesis, spectroscopic characterization and luminescence property of transition metal complexes of 2-(3-phthalylhydrazidylazo)- ethylacetoacetate

Department of Chemistry, Mother Teresa Women’s University, Kodaikanal-624 101, Tamilnadu, India

Department of Chemistry, University of Kerala, Kariavattom Campus, Trivandrum-695 581, Kerala, India

E-mail : drkmohanan@rediffmail.com

Manuscript received online 06 November 2013, accepted 11 March 2014

A simple, efficient and green synthetic protocol of bivalent transition metal complexes of a luminol derivative namely (3-phthalylhydrazidylazo)ethylacetoacetate under microwave irradiation in the absence of solvent has been described. The complexes have been characterized on the basis of elemental analysis, molar conductance, magnetic susceptibility measurements and various spectral studies. The spectral studies have revealed that the ligand acts as monobasic tridentate coordinating to the metal ion through acetyl carbonyl, hydrazo nitrogen and amido carbonyl of phthalylhydrazide moiety. The electron paramagnetic resonance spectra of copper(II) complex has shown that the metalligand bond has considerable covalent character. The ligand and nickel(II) complex have been subjected to powder X-ray diffraction study. The high degree of crystallinity of the ligand has been lost on complexation with metal ion. The electrochemical behavior of the copper(II) complex has been also examined. The luminescence properties of complexes have been compared with that of the free ligand.