FORMATION OF MN-2+, CO-2+, NI-2+ AND CU-2+ COMPLEXES OF PARA-SUBSTITUTED BENZYLIDENE NICOTINYL HYDRAZONES

Two new series of [M(L)2(H2O)2] and [Mn(L)2(H2O)2]Cl2 complexes (M = Mn2+, Co2+, Ni2+ and Cu2+, L = monoaniomic bidentate ligands) have been prepared and characterised by DTA and TGA analysis. IR spectra indicated that the enolate oxygen and the C = N group are participating in complex formation in presence of metal(II) acetate, whereas the C = O group as well as the azomethine nitrogen are contributing to complex formation in presence of metal(II) chloride. Measurements of magnetic moments, ligand field and electron paramagnetic resonance spectra showed that Mn(II), Co(II) and Ni(II) exhibit octahedral geometry whereas Cu(II) ions display an axial elongated symmetry D 4b.