Synthesis,Characterzation And Fluorescence Properties Of Rare Earth Perchlorate With Phenyl-Naphthoylmethyl Sulfoxide

Four solid binary complexes of rare earth perchlorate with Phenyl-naphthoylmethyl Sulfoxide and fourteen solid trinary complexes of rare earth perchlorate with Phenylnaphthoylmethyl Sulfoxide (L) as the first ligand and O-Phenanthroline(L'), Benzoic Acid(L'), Salicylic Acid(L'),2.2'-Dipyridyl(L'), Sulfosulicylic acid(L'),4-Chlorobenzoic acid (L'),Phenoxyacetic acid(L') as the second ligands have been synthesized and characterized. By elemental analysis, coordination titration and TGA-DSC studies, the composition of the complexes were suggested as REL4·L'(C104)3·2H20 (RE=Sm, Eu; L'= Dipy, phen; L C10H7COCH2SOC6H5); REL4·L'(ClO4)2·2H2O (RE=Sm, Eu; L'-=C6H5COO-; C6H4OHCOO-; ClC6H4COO-; HSO3C6H3(OH)COO-; L= C10H7COCH2SOC6H5); REL3·L'(C104)2-2H20(RE=Sm, Eu, L'=C6H5OCOO-; L=C10H7COCH2SOC6H5). IR spectra and 1HNMR spectra studies indicated that Phenyl-naphthoylmethyl Sulfoxide (L) bonded with RE3+ ions by the oxygen atom in sulfinyl group and the oxygen atom in carbonyl group. The second ligands O-Phenanthroline and 2.2'-Dipyridyl bonded with RE3+ ions by the nitrogen atom respectively. The second ligand Benzoic Acid bonded with RE3+ ions by one oxygen atom in carbonyl group which coordinated as an unidentate group. But the second ligand Salicylic Acid, Sulfosulicylic acid,4-Chlorobenzoic acid, Phenoxyacetic acid bonded with RE3+ by double teeth chelating slots. The molar conductivities in acetone solution indicated that all the inorganic anions ClO4- are not coordinated with RE3+. The fluorescence spectra illustrate that both of the Sm3+, Eu3+, complexes display characteristic metal-centered fluorescence in solid state. Compared with the binary complexes, some trinary complexes exhibited stronger fluorescence. These Sm3+, Eu3+ complexes with L and O-Phenanthroline,2.2'-Dipyridyl,4-Chlorobenzoic acid and Phenoxyacetic acid exhibited stronger fluorescence. In Eu3+ trinary complexes, all of the second ligands could sensitize the fluorescence of Eu3+ complexes except Benzoic Acid. When the second ligand is Phenoxyacetic acid, the strongest characteristic emission intensity of the ternary Eu(III) complexes was 89410 (a.u.), which was 9.48 times as great as that of the binary Eu(III) complexes. Phosphorescent spectra of ligands showed that the triplet state energy levels of second ligands were different. So the efficiency of the energy transfer was different. The fluorescent decay curves illustrated that all the rare earth complexes had long fluorescent lifetime.