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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

Lanthanum Coordination Polymer Based on Benzimidazole-Dicarboxylic Acid and Phenanthroline:Crystal Structure,Fluorescence and Fluorescent Sensing for Organic Small Molecules

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摘要

合成了两种新的配合物{[Eu3(bidc)4(phen)2(NO3)]·2H2O}n (1)和[Tb2(bidc)3(H2O)2] (2)(bidc =苯并咪唑二羧酸根,phen=1,10-邻菲啰啉).配合物1是链状结构,含有三种不同的金属离子配位环境:Eu(1)O6N2,Eu(2)O8和Eu(3)O6N2.配合物2是二维网状结构,含有两种配位环境相似的金属离子:Tb(1)O8和Tb(2)O8.配合物1在581,593,615,654和702 nm处出现发射峰,为Eu3+的5D0→7FJ(J=0-4)跃迁产生的特征荧光.最强发射峰位于615 nm,对应于5D0→7F2跃迁,为红光.跃迁强度I(5D0→7F2)∶I(5D0→7F1)约为2.5,说明Eu3+不处于反演中心.配合物2在490,545,584和622 nm出现发射峰,归属为中心Tb3+的5D4→7FJ(J=6-3)跃迁产生的特征荧光.在545 nm的发射最强,对应于5D4→7F5跃迁,为绿光.探讨了不同溶剂对配合物1和2荧光的影响.实验结果表明硝基苯对配合物1和2具有显著的荧光猝灭作用,因此配合物1和2可用于环境污染物硝基苯的检测.

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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中图分类号:O76

基金项目:国家自然科学基金项目(21471104)资助

收稿日期:2014-08-12

修改稿日期:2014-11-16

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董高云:首都师范大学化学系, 北京 100048
马雪:首都师范大学化学系, 北京 100048
李佳佳:首都师范大学化学系, 北京 100048
李夏:首都师范大学化学系, 北京 100048

联系人作者:董高云(861832926@qq.com)

备注:董高云,1991年生,首都师范大学化学系硕士研究生.

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引用该论文

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[J]. Spectroscopy and Spectral Analysis, 2015, 35(8): 2208-2211

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(8): 2208-2211

被引情况

【1】李佳佳,李 睿,马 雪,樊婷婷,林一青,宋宇婷,韩婧祺,李 夏. 2-磺酸对苯二甲酸铕配合物的发光性质及对苯甲醛的检测. 光谱学与光谱分析, 2016, 36(2): 345-348

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