acetophenone-based sulfoxide binary and ternary rare earth perchlorate Synthesis, Characterization and Fluorescence Properties
This article was first synthesized and characterized four acetophenone-based sulfoxide (L = C6H5COCH2SOCH2COOH) and Sm3 +, Eu3 +, Tb3 +, Dy3 + rare earth perchlorate complexes and solid twelve to acetophenone carboxylase baseSulfoxide as the first ligand, respectively, benzoic acid, 2,2 '- bipyridine, phenanthroline as the second ligand (L') of rare earth perchlorate ternary solid complexes.By elemental analysis, molar conductivity, rare earth complex titration and thermogravimetric - differential scanning calorimetry, shows that the composition of binary rare earth complexes as: RE L3 · L-· (ClO4) 2.3 H2O (RE = Sm,Eu, Tb, Dy; L = C6H5COCH2SOCH2COOH, L-= C6H5COCH2SOCH2COO-); ternary rare earth complexes composed of: REL2 · L-· L '(ClO4) 2.3 H2O (RE = Sm, Eu, Tb, Dy;L '= C6H5COOH, Dipy, phen; L = C6H5COCH2SOCH2COOH, L-= C6H5COCH2SOCH2COO-).IR and NMR spectra showed that the sulfoxide ligand through carboxylic oxygen atoms and rare earth ions with the carbonyl not involved in coordination, through the neutral carboxylic acid form and rare earth ions, while the bipyridine and o-phenanthroline through their two nitrogen atoms and the rare earth ions.Complexes in DMF solution molar conductivity measurement showed that the complex is 1:2, two ClO4-inorganic counter anions in the outside world did not participate in all coordination.Fluorescence spectra show that, Sm, Eu, Tb, Dy the binary and ternary rare earth complexes are produced characteristic fluorescence emission spectra, ternary complexes of rare earth fluorescence intensity compared with the binary complexes, and some increase, butof it is weakened.This is mainly because in these types of ternary rare earth complexes, the second ligand acid, 2,2 '- bipyridine and phenanthroline triplet state energy level of coverage is different, making the sulfoxide ligand and the secondligand in the UV absorption of energy, the energy transfer efficiency and ease of energy transfer caused by significantly different.Complex fluorescence decay and fitted curve shows that, Sm, Eu, Tb, Dy the binary and ternary rare earth complexes showed strong fluorescence lifetime.
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