Synthesis and Spectral Studies of Some Lanthanide Complexes of Nicotinic Acid Hydrazide

Abstract

Trivalent lanthanide complexes of nicotinic acid hydrazide (NicHz) of the type Ln(NicHz)₃Cl₃.n EtOH [Ln = La, Pr, Nd, Sm for n = 2; Ln = Eu, Gd, Tb, Dy and Y for n = l] have been synthesised. The hypersensitive band profile of the electronic spectrum indicates an eight-coordination around neodymium and the molar absorptivity has been found to increase with increasing pH and to decrease with increasing temperature (30–80°C). FT-far IR spectra indicate a transconfiguration of the two chloro groups within the coordination sphere. A square antiprismatic structure has been proposed for the complexes.