SYNTHESIS AND STRUCTURAL STUDIES OF SOME LANTHANIDE COMPLEXES OF SALICYLALDEHYDE ANTHRANOYL HYDRAZONE

摘要

Lanthanide complexes of the types Ln(sah)(OAc) centre dot xH_2O and Ln'(Hsah)_2(X) centre dot H_2O [Ln = Y, La, Nd, Gd, Tb and Dy; Ln' = Pr and Sm, X = NO_3 and Cl; H_2sah = 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(ash)(OAc) centre dot 4H_2O 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.