Selective fluorescent sensing properties of two Cd-CPs based on 4,4 '-bis (2-methylimidazol-1-yl)diphenyl ether

Two Cd-CPs [Cd(MIP)(BMIOPE)]n (1) and [Cd(NO2-BDC)(BMIOPE)]n (2) were constructed (H2MIP, NO2-H2BDC and BMIOPE are 5-methylisophthalic acid, nitroterephthalic acid and 4,4 '-bis(2-methylimidazol-1-yl)diphenyl ether). Complex 1 shows two-fold 2D-)2D interpenetrating structures with 4-c sql topological net and complex 2 is five-fold 3D-)3D interpenetrated structures with 4-c unc topological net. The luminescence sensing experi-ments revealed that complexes 1 and 2 could simultaneously detect UO22+, Cr2O72-and CrO42-, and NFT (nitro-furantoin) in aqueous solution with excellent selectivity and sensitivity. The limit of detection (LOD) values for complex 1 are 6.78 x 10-5 M for UO22+, 2.22 x 10-6 M for Cr2O72-, 1.83 x 10-5 M for CrO42-and 1.15 x 10- 5 M for NFT. The above values of complex 2 are 1.11 x 10-4, 1.17 x 10-4, 2.81 x 10-5, 6.32 x 10-5. Finally, the luminescent quenching mechanism is investigated in detail.