Synthesis and Characterization of Some lanthanide (III) Chloro Complexes with 4-[N-(4´-nitrobenzylidene) amino] antipyrine Thiosemicarbazone and Pyridine as Ligands

A novel series of some lanthanide (III) chloro complexes with 4-[N-(4´-nitrobenzalidene) amino] antipyrine thiosemicarbazone (4´-NO2BAAPTS) as primary ligand and pyridine (Py) as secondary ligand with the general composition [LnCl3•2(4´-NO2BAAPTS) Py] (Ln= La, Pr, Nd, Sm, Gd, Tb, Dy or Ho) are reported. All the complexes are non-electrolytic in nitrobenzene. The infrared spectral studies revealed that thiosemicarbazone (4´-NO2BAAPTS) is tridentate (N, N, S), while pyridine is coordinated to the central metal ion through its hetro-N atom. Magnetic, spectral (infrared and electronic) and thermal properties of the complexes have also been investigated. A coordination number of ten is suggested in these complexes.