Study on the Synthesis, Characterization of Structure and Fluorescence Properties of the Solid Complex of Europium Ion with 1,10-Phenanthroline and 2-Thiopheneglyoxylic Acid
YU Bin1, SUN Bo1*, ZHAO Ying2, YAN Xiao-qi1
1. Department of Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China 2. State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry，Chinese Academy of Sciences, Beijing 100080, China
Abstract：The complex of europium with 1, 10-phenanthroline and 2-thiopheneglyoxylic acid (HL) was synthesized. Its chemical formula was determined to be [EuL2·phen·(H2O)3]NO3 by elemental analysis, electrical conductivity, IR and 1H NMR. It was found that the europium ion coordinated to the O atoms of 2-thiopheneglyoxylic acid and H2O, and to the N atoms of 1,10-phenanthroline. Its fluorescence property was determined by the excitation and emission spectra at room temperature, the emission peaks at 592 and 618 nm were assigned to the 5D0-7F1 and 5D0-7F2, respectively. It was also observed that the title complex emits strong red fluorescence under ultraviolet light at room temperature. In the IR spectrum, the characteristic absorptionνCO(1 719cm-1)，νC—O(1 232 cm-1)，δO—H(909 cm-1) of 2-thiopheneglyoxylic acid disappeared in the complex, the νas and νs of —COO- appeared at 1 642 and 1 408 cm-1 in the complex respectively. In 1H NMR, the signals of 2-thiopheneglyoxylic acid were shifted upfield, and those of 1,10-phenanthroline downfield. It is proved by the TG curve that the complex is stable from ambient temperature to 250 ℃.
Key words：Complex of Europium;2-thiopheneglyoxylic acid;1;10-phenanthroline;Fluorescence spectra;FTIR spectra
于 斌1, 孙 波1*, 赵 莹2, 阎晓琦1 . 2-噻吩乙醛酸-邻菲罗啉-铕配合物的合成、结构表征及荧光性能的研究[J]. 光谱学与光谱分析, 2004, 24(12): 1571-1574.
YU Bin1, SUN Bo1*, ZHAO Ying2, YAN Xiao-qi1 . Study on the Synthesis, Characterization of Structure and Fluorescence Properties of the Solid Complex of Europium Ion with 1,10-Phenanthroline and 2-Thiopheneglyoxylic Acid . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(12): 1571-1574.
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