[Synthesis, characterization and fluorescence of Eu3+, Tb3+ complexes with 2-thiophencarboxylic acid and 2,2'-bipyridine].
Two binary complexes of Eu3+ and Tb3+ with 2-thiophene carboxylic acid and two ternary complexes of Eu3+ and Tb3+ with 2-thiophene carboxylic acid(L)-2, 2'-bipyridine were synthesized. By elemental analysis, rare earth coordination titration, and molar conductivities studies, the compositions of the complexes were suggested as REL3 x 2H2O and REL3L' x C2H5OH(RE=Eu, Tb, L = 2-thiophene carboxylic acid, L' = 2, 2'-bipyridine) respectively. The ligands and coordination compounds were studied by means of IR spectra, 1H NMR and fluorescence excitation and emission spectra. IR spectra and 1H NMR studies indicate that 2-thiophene carboxylic acid was bonded with RE(III) through oxygen atoms in the carboxyl group, and 2, 2'-bipyridine ligand was bonded to RE(III) through nitrogen atoms. The fluoresence spectra showed that the fluorescence emission intensity of ternary complexes was stronger than that of the binary complexes.
Bao
Jin-rong
JR
The College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China. nmbaojinrong@sina.com
Zhao
Yong-liang
YL
Zhu
Xiao-wei
XW
D015082:2,2'-Dipyridyl / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D005063:Europium / Q000032:analysis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D013725:Terbium / Q000032:analysis* / Q000737:chemistry; D013876:Thiophenes / Q000737:chemistry*
D002264:Carboxylic Acids; D002412:Cations; D013876:Thiophenes; D013725:Terbium; C550746:2-thiophene carboxylic acid; D005063:Europium; D015082:2,2'-Dipyridyl