Synthesis And Luminescent Properties Of The Solid Ternary Complexes Of Rare Earths With L-Tyrosine And Glycine

The solid ternary complexes with the formula of RE(Tyr)1.5(Gly)4(ClO4)3 have been synthesized by reacting RE(C1O4)3 (RE=Pr, Eu, Tb, Tm) with L-Tyrosine and Glycine in alcohol solution as well as two series of solid ternary mixed complexes of Eu3+ mixed Tm3+ and Tb3+ mixed Tm3+ with L-Tyrosine and Glycine in various molar ratios of rare earths. The complexes have also been characterized by molar conductance, IR spectra, thermal analysis and fluorescence spectra.The molar conductance and IR spectra imply that one anions ClO4-are coordinated and the other two are not. Thermal analysis indicates that the complexes have high stability which decomposed above 239癈. IR spectra show that in the title complexes the carboxylic group of Glycine is probably coordinated with rare earth ion in monodentate pattern, and the carboxylic group of L-Tyrosine is probably coordinated with rare earth ion in bidentate bridged pattern and bidentate chelated pattern. From fluorescence spectra, it is found that the fluorescence intensities of the Tb3+ complexes (Tb: 5D4-7F6, 7F5, 7F4 ) have enhanced one order as strong as that of the corresponding perchlorate hydrate. In the complexes mixed Tm+, Tm3+ performs sensitization on the fluorescence of Eu3+ and Tb3+. When ratio of Eu3+ and Tb3+ to Tm3+ is 0.999:0.001, the fluorescence intensities of the mixed complexes reach highest and increase 175.8% and 145.9% as against those of corresponding ternary complexes of Eu + and Tb3+.