Synthesis, Spectroscopic and Thermogravimetric studies on some Transition metal complexes with hydrazone ligands.

Abstract

Complexes of Cu (II) and Ni (II) derived from 2-amino-N’-(2-hydroxybenzylidene) benzohydrazide (ASH) , 2-amino-N’-benzylidenebenzohydrazide (ABH), N’-(3-phenylallylidene)-2-((3-phenylallylidene)amino)benzohydrazide (ACH), and N’-(4-methoxybenzylidene)-2-((4-methoxybenzylidene)amino)benzohydrazide (AAH) have been synthesized and characterized by elemental  and  thermal analysis(TGA),  IR, U.V-Visible, ¹ H NMR (Ligands) spectral studies, magnetic susceptibility, atomic absorption and molar conductivity measurements, the ligand (ASH) act as tridentate with ONO donor sites, the bonding sites are carbonyl oxygen , azomethine nitrogen and phenolate oxygen, the other ligands act as bidentate with ON donor sites, the bonding sites are carbonyl oxygen, azomethine nitrogen, the metal complexes exhibit  different geometrical structures such as square pyramidal, tetrahedral, square planar and octahedral. The Coats-Redfern equation has been used to calculate the thermodynamic parameters for different thermal decomposition steps of some complexes.