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The Synthesis,Characterization and Spectroscopic Properties for Binary Rare Earth Complexes with 2-Hydroxy-6-Methylnicotinic Acid

ZHANG Yong1,LIAO Li-ling2,LIU Yu-bo1,LI Cun-xiong1,3*(1.Key Laboratory Information System of Mountains Area and Protection of Ecological Environment of Guizhou Province,Guizhou Normal University,Guiyang Guizhou 550001,China;2.College of Chemistry and Materials Sciences,Guizhou Normal University, Guiyang Guizhou 550001,China;3.College of Chemistry and Life Sciences,Guizhou Normal College,Guiyang Guizhou 5500183,China)  
Four new binary complexes of rare earths with 2-hydroxy-6-methylnicotinic acid(HA) were synthesized and characterized by FTIR spectra and elemental analysis,and carboxyl of the ligand chelated with rare earth ions in chelating bidentate mode.The composition of the complexes was confirmed to be LnA3·3H2O(Ln=La,Eu,Gd,Tb).The fluorescence properties of Eu3+ and Tb3+ complexes were specially studied,two complexes both had good fluorescence propertie:η(5D0→7F2/5D0→7F1) of EuA3·3H2O is 5.9,η(5D0→7F2/5D0→7F1) of TbA3·3H2O is 1.9;2-Hydroxy-6-methyl nicotine acid has a strong antenna effect on Eu3+ and Tb3+;The measured fluorescence lifetime of EuA3·3H2O is 0.84 ms and TbA3·3H2O is 0.58 ms.
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