Study on Synthesis and Matching Degree of Energy Level of Terbium Complexes Using o-Fluoro-Benzoic Acid as Ligand
TAO Dong-liang1, 3, ZHANG Kun1, ZHANG Hong1, CUI Yu-min1, 3, XU Yi-zhuang2*, LIU Yu-hai2
1. College of Chemistry and Chemical Engineering, Fuyang Normal College, Fuyang 236041, China 2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China 3. Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang 236041, China
Abstract：Tb(2-FBA)3·2H2O and Tb(2-FBA)3phen were synthesized using o-fluoro-benzoic acid (2-FBA) as the first ligand, and 1,10-phenanthroline (phen) as the second ligand. Elemental analysis and IR spectra were employed to characterize the molecular composition of the two kinds of lanthanide complexes. The UV absorption spectra with same concentration show that the second ligand phen of Tb(2-FBA)3phen absorbs the portion of the UV light instead of the first ligand 2-FBA. Liquid fluorescence spectra with same concentration show that the fluorescence intensity of Tb(2-FBA)3·2H2O is higher than that of Tb(2-FBA)3phen. The analytical results show that the energy level of 2-FBA matches the lowest excited state energy level of Tb3+ (5D4) better than that of phen. The O—H oscillation of the crystal water in Tb(2-FBA)3·2H2O will greatly consume the absorbed energy by ligands, and cause the fluorescence intensity of Tb(2-FBA)3·2H2O significantly decline. The energy level of triplet state of the first ligand 2-FBA corresponding to the absorption peak 273 nm has poor matching degree with the 5D4 energy level of Tb3+. In this case, the emission intensity of Tb(2-FBA)3·2H2O is still stronger than that of Tb(2-FBA)3phen. It illustrates that the energy level of the triplet state of the first ligand 2-FBA corresponding to 252 nm has much better matching degree with the lowest excited state of 5D4 energy level of Tb3+ than that of phen. It is the only way to compensate for energy loss by thermal vibration of water molecules and low energy transfer efficiency for poor matching degree between the energy level of corresponding to 273 nm of the first ligand 2-FBA and 5D4 energy level of Tb3+. By combining UV absorption spectra with fluorescence spectra of lanthanide complexes to qualitatively analyze energy level of ligands, the contribution of different types of ligands to the fluorescence properties can be preliminarily understood.
Key words：o-fluoro-benzoic acid;Terbium complexes;Fluorescence property;UV absorption spectra;Matching degree of energy level
陶栋梁1, 3，张 坤1，张 宏1，崔玉民1, 3，徐怡庄2*，刘毓海2 . 邻氟苯甲酸铽配合物的制备及其能级匹配程度研究 [J]. 光谱学与光谱分析, 2014, 34(04): 994-998.
TAO Dong-liang1, 3, ZHANG Kun1, ZHANG Hong1, CUI Yu-min1, 3, XU Yi-zhuang2*, LIU Yu-hai2 . Study on Synthesis and Matching Degree of Energy Level of Terbium Complexes Using o-Fluoro-Benzoic Acid as Ligand . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 994-998.
[1] WANG Man-li, ZHANG Xiao-hui, YIN Hong-zong, et al(王曼丽，张肖会，尹洪宗，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2013, 33(4): 1009. [2] LI Hui-zhen, JIA Ya-li, QIAO Xue-ling, et al(李慧珍，贾亚丽，乔雪玲，等). Chinese Journal of Luminescence (发光学报), 2013, 34(1): 54. [3] Kong K H. Zhang X, Ma R J, et al. Journal of Rare Earths, 2013, 31(1): 32. [4] Murase M, Yamauchi S, Sakamoto S, et al. Polyhedron, 2013, 59(1): 76. [5] Yuan Wei, Cui Yumin, Shi Ruijuan, et al. Journal of Rare Earths, 2011, 29 (11): 1013. [6] TAO Dong-liang, CUI Yu-min, YIN Rong-can, et al(陶栋梁，崔玉民，殷榕灿，等). Journal of the Chinese Rare Earth Society(中国稀土学报), 2010, 28 (6): 693. [7] Liu M J, Ye Z Q, Xin C L. Analytica Chimica Acta, 2013, 761: 149. [8] ZENG Hai-yan, YANG Yan-sheng, HUANG Shi-hua(曾海燕，杨艳生，黄世华). Chinese Journal of Luminescence(发光学报), 1995, 16(4): 354. [9] ZHOU He-feng, WANG Hua, ZHANG Ting, et al(周禾丰，王 华，张 婷，等). Journal of Functional Materials(功能材料), 2011, 42(6): 1054. [10] Frank J Steemers, Willem Verboom, David N Reinhoudt, et al. Journal of the American Chemical Society, 1995, 117(37): 9408.
