Copper(II), nickel(II), zinc(II) and vanadium(IV) Schiff base complexes: Synthesis, characterization, crystal structure determination, and thermal studies

Four new bis-chelate ML2 complexes (M = Cu2+, Zn2+, VO2+ and L = 1-[Furan-2-(ylmethylimino) methyl]naphthalene-2-olate) with bidentate NO Schiff base ligand were synthesized and characterized by spectral and analytical techniques. The crystal structures of CuL2, NiL2, and VO[were determined by single crystal X-ray analysis. These complexes crystalized in the monoclinic system with the space groups of P2(1)/n, P2(1)/n, and C2/c, respectively. The Schiff base ligand acts as bidentate ligand and coordinates to the metal center via N and 0 atoms. The NiL2 and CuL2 complexes exhibit a distorted square planar coordination geometry while in the case of VOL2 the geometry is distorted square-pyramidal. In all cases, two Schiff base ligands bind to the metal centers in the trans O-M-N manner. Thermal analysis and thermal decomposition of the titled complexes were investigated. The data of TGA, XRD and SEM analyses revealed that they were converted to corresponding metal oxides in a form of nanoparticles (NiO, CuO, ZnO and V2O5). (C) 2018 Elsevier Ltd. All rights reserved.