title: [Synthesis, characterization and fluorescence of Eu3+, Tb3+ complexes with 2-thiophencarboxylic acid and 2,2'-bipyridine].
abstract: 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.
authors.affiliation: The College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China. nmbaojinrong@sina.com
authors.forename: Jin-rong
authors.initials: JR
authors.lastname: Bao
authors.forename: Yong-liang
authors.initials: YL
authors.lastname: Zhao
authors.forename: Xiao-wei
authors.initials: XW
authors.lastname: Zhu
mesh_terms: 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*
chemical_list: D002264:Carboxylic Acids; D002412:Cations; D013876:Thiophenes; D013725:Terbium; C550746:2-thiophene carboxylic acid; D005063:Europium; D015082:2,2'-Dipyridyl