Synthesis, Magnetic, Spectral and Thermal Studies of Some Lanthanide Nitrate and Isothiocyanate Complexes with 4[N-(4-Dimethylaminobenzylidine)amino] Antipyrine

Abstract A new series of complexes of lanthanide(III) nitrate and isothiocynates with 4[N-(4-dimethylaminobenzylidene)amino]-antipyrine (DABAAP) having the general formula [Ln(DABAAP)2(NO3)3] (where Ln = La, Pr, Nd, Sm, Gd, Tb or Dy) and [Ln (DABAAP)n(NCS)3] (n=2, Ln = La or Pr; n = 3, Ln = Nd, Sm, Gd, Tb, or Dy) have been synthesized and their i.r. and electronic spectra obtained. In these complexes DABAAP acts as a bidentate ligand coordinating through the carbonyl oxygen and azomethine nitrogen atoms. The nitrate ion acts as a bidentate ligand and the isothiocyanate ion is N-coordinating with the lanthanide ion. The probable coordination number of the Ln3+ ion varies among seven, nine and ten. The thermal stability of the complexes have also been studied through t.g. analyses. Referee I: J. L. Burmeister Referee II: G. R. Choppin