Synthesis and Characterization of 1-Naphthoic Acid Rare Earth Complexes at Low Temperature Solid State Reaction

Three solid complexes of rare earth with 1-naphthoic acid(L)have been synthesized by method of solid state reaction at low temperature.Elemental analysis,rare earth coordination titration and TGA studies suggest that the composition of the complexes is RE(L)3·nH2O(n=0～1;RE=La,Nd,Eu;L=C10H7COO-).IR spectra and 1 HNMR studies indicated that the ligand(L)is bonded with RE(Ⅲ)ions by two oxygen atoms in carboxyl group which coordinate as an asymmetrical bridging bidentate group.The molar conductivity in DMSO solvent indicates that all complexes are non-electrolyte.Fluorescence spectra of Eu3+ complexe and phosphorescence spectra of ligand show that the ligand has sensitized Eu3+ ion in fluorescence intensity.