Synthesis and characterization of La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III) & Dy(III) complexes of 2- acetylfuran-2-thenoylhydrazone

Abstract

The reaction of 2-acetylfuran-2-thenoylhydrazone(afth) with Ln(III) trichlorides yields complexes of the type [Ln(afth)Cl 2(H 2O)(EtOH)]Cl. [Ln(III) = La, Pr, Nd, Sm, Eu, Gd. Tb and Dy]. The complexes have been characterized by molar conductance, magnetic susceptibility and TGA and DTA measurements. FAB mass, infrared, proton NMR. electronic absorption and emission spectra. The terbium complex is found to be monomer from the FAB mass spectrum. The IR and NMR spectra suggest neutral tridentate behaviour of the Schiff base. A coordination number seven is proposed around the metal ions. Emission spectra suggests C 3v, symmetry around the metal ion with capped octahedron geometry for the europium complex.