Synthesis and luminescence properties of two novel lanthanide (III) perchlorate complexes with bis(benzoylmethyl) sulfoxide and benzoic acid.
Two novel ternary rare earth complexes of Tb(III) and Dy(III) perchlorates with bis(benzoylmethyl) sulfoxide (L) and benzoic acid (L') had been synthesized and characterized by elemental analysis, coordination titration analysis, molar conductivity, IR, TG-DSC, (1)HNMR and UV spectra. The results indicated that the composition of these complexes was REL(5)L'(ClO(4))(2) x nH(2)O (RE = Tb(III), Dy(III); L = C(6)H(5)COCH(2)SOCH(2)COC(6)H(5), L' = C(6)H(5)COO; n = 6,8). The fluorescence spectra illustrated that the ternary rare earth complexes presented stronger fluorescence intensities, longer lifetimes and higher fluorescence quantum efficiencies than the binary rare earth complexes REL(5) x (ClO(4))(3) x 2 H(2)O. After the introduction of the second ligand benzoic acid group, the relative fluorescence emission intensities and fluorescence lifetimes of the ternary complexes REL(5)L'(ClO(4))(2) x nH(2)O (RE = Tb(III), Dy(III)) enhanced more obviously than the binary complexes. This indicated that the presence of both organic ligands bis(benzoylmethyl) sulfoxide and the second ligand benzoic acid could sensitize fluorescence intensities of rare earth ions, and the introduction of benzoic acid group was resulted in the enhancement of the fluorescence properties of the ternary rare earth complexes. The phosphorescence spectra were also discussed.
Li
Wen-Xian
WX
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, People's Republic of China. nmglwx@163.com
Chai
Wen-Juan
WJ
Sun
Xiao-Jun
XJ
Ren
Tie
T
Shi
Xiao-Yan
XY
D019817:Benzoic Acid / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008163:Luminescent Measurements; D010472:Perchlorates / Q000138:chemical synthesis* / Q000737:chemistry*; D012451:Safrole / Q000031:analogs & derivatives* / Q000737:chemistry; D013057:Spectrum Analysis; D013454:Sulfoxides / Q000737:chemistry*
D028581:Lanthanoid Series Elements; D010472:Perchlorates; D013454:Sulfoxides; D019817:Benzoic Acid; D012451:Safrole; C494474:perchlorate; C005746:sulfoxide