Preparation, Spectroscopic Characterisation and Thermal Analyses Studies of the Cu(Ii), Pd(Ii) and Vo(Iv) Complexes of Some Schiff Base Ligands

Abstract

New Schiff base ligands, N-(3-methoxysalicylidene)-3,5-di(tert-butyl)-4-hydroxy aniline (HL1), N-(3-hydroxysalicylidene)-3,5-di(tert-butyl)-4-hydroxyaniline (HL2) and N-(4-hydroxysalicylidene)-3,5-di((tert-butyl)-4-hydroxyaniline (HL3) with their Cu(II), Pd(II) and VO(IV) complexes were synthesized and characterized by elemental analyses, IR, electronic absorption spectral data, magnetic moment and molar conductance. For the ligands and their Pd(II) complexes, 1H and 13C NMR spectra were obtained. 1H and 13C NMR spectra suggest that the ligands in the Pd(II) complexes coordinate through the nitrogen atom of the azomethine group and the oxygen atom of the phenolic (C-OH) group. All the compounds were found to be non-electrolytes in DMSO However, the Pd(II) complexes exhibit low conductance in DMF due to solvolysis. Thermal studies show that the complexes decompose with the loss of water, followed by the organic ligand to give the corresponding metal oxides.