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.

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.