Formation of Binuclear Metal Complexes with Multidentate Schiff-base Oxime Ligand: Synthesis and Spectral Investigation

The new polydentate Schiff-base oxime (1E,1`E)-2hydroxy-3-((E)-(2-((E)-2- hydrxy3-((E)-(hydroxyimino)methy l)-5-methy lbenzyldeneamino)ethy limino)methyl)-5- methylbenzaldehyde oxime H4L and its binuclear metal complexes with Mn(II), Fe(II), Co(II) and Cu(II) are reported. The reaction of 2,6 diformyl–4–methy l phenol with hydroxyl amine hydrochloride in mole ratios of 1:1 gave the precursor (E)-2-hydroxy-3- ((hydroxyimino)methy l)-5-methy lbenzaldehyde. Condensation reaction of precursor with ethy lenediamine in mole ratios of 2:1 gave the new N4O2 Schiff-base oxime ligand H4L. Up on complex formation, the ligand behaves as a tribasic hexadantate sp ecies. The mode of bonding and overall geometry of the complexes were determined through physico-chemical and spectroscopic methods. These studies revealed tetrahedral geometries for M n(II), Fe(II), Co(II) complexes and square planar geometry about Cu(II) complex of general formulae [M 2(HL)](Cl)(H2O). M olecular structure of the for Mn(II), Fe(II), Co(II) complexes has been optimised by CS Chem 3D Ultra Molecular Modeling and Analysis Program and sup ported four coordinate geometry