Synthesis and structural studies of some lanthanide complexes of salicylaldehyde anthranoyl hydrazone

Abstract

Lanthanide complexes of the types Ln(sah)(OAc)·xH2O and Ln′(Hsah)2(X)·xH2O [Ln=Y, La, Nd, Gd, Tb and Dy; Ln′=Pr and Sm, X=NO3 and Cl; H2sah=salicylaldehyde anthranoyl hydrazone were synthesized and characterized by various physico-chemical techniques. The complexes are coloured and highly soluble in methanol, DMSO and DMF. Dehydration studies indicate the presence of both lattice-held and coordinated water molecules. IR, electronic and 1H NMR spectra have been recorded to establish the bonding sites of the ligand. Solution-state conductance measurements indicate the non-electrolytic nature of all of the complexes while solid-state electrical conductivity studies show Nd(sah)(OAc)·4H2O to be a semiconductor. Optical band gap measurements show the Pr, Sm and Dy complexes are direct band gap materials. X-ray diffraction patterns of selected complexes indicate orthorhombic structures.