Lanthanum Coordination Polymer Based on Benzimidazole-Dicarboxylic Acid and Phenanthroline: Crystal Structure, Fluorescence and Fluorescent Sensing for Organic Small Molecules
DONG Gao-yun, MA Xue, LI Jia-jia, LI Xia*
Department of Chemistry, Capital Normal University, Beijing 100048, China
Abstract：Two new complexes, {[Eu3(bidc)4(phen)2(NO3)]·2H2O}n(1) and [Tb2(bidc)3(H2O)2](2)(bidc=benzimidazole-dicarboxylate, phen=1, 10-phenanthrolIne) were synthesized. Complex 1 shows 1D chain structure. The asymmetric unit of 1 contains three crystallographically different Eu3+, Eu (1)O6N2, Eu(2)O8 and Eu(3)O6N2. Complex 2 reveals 2D structure. It contains two crystallographically similar Tb3+, Tb(1)O8 and Tb(2)O8. Complex 1 displays the emission peaks at 581, 593，615，654 and 702 nm, corresponding to the 5D0→7FJ (J=0-4) transitions of Eu3+. The most intense emission at 615 nm is attributed to the 5D0→7F2 transition, implies a red emission light of 1. The intensity rations I(5D0/7F2)/I(5D0/7F1) is about 2.5, indicating the chemical environment around Eu3+ does not have an inversion center. Complex 2 exhibits four emission peaks at 492, 545, 584 and 622 nm, corresponding to the 5D4→7FJ(J=6-3) transitions of Tb3+. The emission band at 545 nm corresponds to the 5D4→7F5 transition of the Tb3+, which gives an intense green luminescence output for the solid sample. Notably, the solvent-dependent luminescence behavior of complexes 1 and 2 was discussed. They show highly selective for nitrobenzene via a fluorescence quenching mechanism. The highly selective and sensitive sensing nitrobenzene leads to its application in environmental system.
董高云，马 雪, 李佳佳, 李 夏* . 稀土离子与苯并咪唑二羧酸和邻菲啰啉配合物：晶体结构、荧光及对有机小分子的荧光传感 [J]. 光谱学与光谱分析, 2015, 35(08): 2208-2211.
DONG Gao-yun, MA Xue, LI Jia-jia, LI Xia* . Lanthanum Coordination Polymer Based on Benzimidazole-Dicarboxylic Acid and Phenanthroline: Crystal Structure, Fluorescence and Fluorescent Sensing for Organic Small Molecules. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(08): 2208-2211.
[1] Uemura K, Kitagawa S, Fukui K, et al. J. Am. Chem. Soc., 2004 126：3817. [2] Yaghi O M, Li H, Davis C, et al. Chem. Res., 1998, 31: 474. [3] Eddaoudi M, Kim J, Rosi N, et al. Science, 2002, 295: 469. [4] Kitagawa S, Kitaura R, Noro S I. Angew. Chem., Int. Ed., 2004, 43: 2334. [5] Lu Ye, Yan Bing. Chem. Commun., 2014, 50: 15443. [6] Reineke T M, Eddaoudi M, Fehr M，et al. J. Am. Chem. Soc., 1999, 121: 1651. [7] Reinhard C, Gudel H U. Inorg. Chem., 2002, 41: 1048. [8] Xu Xiaoyu, Yan Bing. ACS Appl. Mater. Interfaces, 2015, 7: 721. [9] Lu Ye, Yan Bing, Liu Kinliang. Chem. Commun., 2014, 50: 9969. [10] LI Yilei，Liu Qingyang, Chen Ling. J. Chem., 2015, 68: 488. [11] Yan Zhiyuan, Yan Bing. Inorg. Chem. Commun., 2014, 47: 96. [12] WUREN QI Mu-ge, ZHAO Yong-liang, MA Rui-jun(乌仁其木格，赵永亮，马瑞军). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2011, 31(8): 2144. [13] Sheldrick G M. SHELXS-97, Program for Crystal Structure Solution. University of Gottingen, Germany, 1997. [14] Sheldrick G M. SHELXL-97, Program for Crystal Structure Refinement. University of Gottingen, Germany, 1997.
