Synthesis And Characterization Of Complexes Of Rare Earth Perchlorita With Dinaphthyl Disulfoxide,Diphenyl Disulfoxide And Studies On Fluorescence Of Complexes

Solid complexes of rare earth perchlorate with naphthyl- naphthalinesulphinylpropyl sulfoxide (dinaphthyl disulfoxide, L) and phenyl- benzenesulphinylpropyl sulfoxide (diphenyl disulfoxide, L') have been synthesized and characterized. By elemental analysis, coordination titration and TGA-DTA studies, the composition of the complexes were suggested as RE₂(ClO₄)₆.(L)₅.nH₂O(RE= La, Pr, Nd, Eu, Tb, Dy, Ho,Tm, Yb, Y) (n = 0-8) and RE₂(ClO₄)₆.(L')₇(RE= La, Eu, Tb).IR spectra, ¹HNMR studies indicated that four dinaphthyl disulfoxides(L) bonded with RE³⁺ ions by the two oxygen atoms in each disulfinyl group which coordinate as a chelate bidentate group, while another one bonded with two RE³⁺ ions by the two oxygen atoms in disulfinyl group which coordinate as a bridging group. The Molar conductivities in DMSO solution indicate that four inorganic anions ClO₄^- are coordinated with RE³⁺and other is not. Phosphorescent spectra of ligand(L) show that triplet state of ligand(L) is matching with ⁵D₀ energy of Eu³⁺ and ligand(L) can transfer energy to Eu³⁺ but is not matching with ⁵D₄ energy of Tb³⁺ . Fluorescence spectrum of Tb³⁺ complex show that ligand and ClO₄^- have sensitized the fluorescence of Tb³⁺ by descending the symmetry of Tb³⁺ in complex.In the complexes of rare earth perchlorate with diphenyl disulfoxide, six diphenyl...