Some trivalent lanthanide complexes of I-tyrosine hydrazide

Abstract

Tyrosine hydrazide (TH) has been found to form complexes of the types [M(TH)3Cl2]Cl [M=La(III), Pr(III), Nd(III)] and [M′(TH)2Cl2]Cl [M′=Sm(III), Eu(III), Gd(III) and Dy(III)]. The complexes have been characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared, electronic and PMR spectral studies. The nephelauxetic ratio (β), covalency (δ) and bonding parameter, (b 1/2) of [Nd(TH)3Cl2]Cl have been calculated. Infrared spectral studies reveal that TH acts as a neutral bidentate ligand. Coordination numbers of eight around La(III), Pr(III) and Nd(III) and six around Sm(III), Eu(III), Gd(III) and Dy(III) have been proposed in the complexes.