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.