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.