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

摘要

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 TAG and DTA measurements. FAB mass, infrared, proton NMR, electronic absortion and emission spectra. The terbium complex is found to be monomer from the FAB mass spectrum. The Ir and NMR spectra suggest neutral triidentate behaviour of the Schiff base. A coordiantion 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.