Polymetallic complexes. Part-CVII : Synthesis, spectral, XRD, molecular modeling and antibacterial study of tetrameric CoII, NiII, CuII, ZnII, CdII and HgII complexes with OON-NOO donor hexadentate azodye ligand

Department of Chemistry, G. M. Autonomous College, Sambalpur-768 004, Odisha, India

E-mail : mahapatra.bipin@yahoo.com

Department of Chemistry, Govt. College, Koraput, Odisha, India

E-mail : satyanarayanchaulia@gmail.com

Manuscript received 8 November 2013, revised 20 May 2013, accepted 13 February 2014

Six tetrameric complexes of Co^II, Ni^II, Cu^II, Zn^II, Cd^II and Hg^II with one new symmetrical OON-NOO donor hexadentate azodye ligand, 4,4´-bis(2´-hydroxy-3´-formyl-5´nitrophenylazo)diphenylmethane have been synthesized. The characterization of these complexes has been made by elemental analysis, conductance measurement, magnetic, IR, electronic spectra, ESR, NMR, XRD (powdered pattern) and molecular modeling methods. The antibacterial study of the ligand and some of the complexes has been made against Gram-positive bacteria S. aureus and Gram-negative bacteria E. coli. The Co^II, Ni^II and Cu^II complexes are found to be distorted octahedral and a tetrahedral stereochemistry has been assigned to Zn^II, Cd^II and Hg^II complexes. A monoclinic crystal system is suggested for Cu^II complex. Crystallite size of the complex was found to be 0.512 nm.