| 光谱学与光谱分析 |
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| 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 |
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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.
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Received: 2014-08-12
Accepted: 2014-11-16
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Corresponding Authors:
LI Xia
E-mail: xiali@cnu.edu.cn
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