Design and syntheses of two luminescent metal-organic frameworks for detecting nitro-antibiotic, Fe3+ and Cr2O72-

Two zinc(II)-coordination polymers, namely [Zn-2(L-1)(2)(bpa)(H2O)(2)].2(H2O) (1) and [Zn(L-1)(bpp)] (2) (where L-1 = 5-(2-cyanophenoxy) isophthalic acid; bpa = 1,2bis(4-pyridine)-ethane; and bpp = 1,3-bis(1)pyridyl propane) have been synthesized under hydrothermal conditions. Both as-synthesized samples were characterized by element analysis, powder X-ray diffraction, infrared spectrum, thermogravimetric analysis and single-crystal X-ray diffraction. Compound 1 crystallizes in the triclinic crystal system with P-1 space group, and compound 2 belongs to the P2(1)/(n) space group of monoclinic system. Both Zn-MOFs have good luminescent properties for rapidly detecting nitro-antibiotics, Cr(2)O(7)(2- )and Fe3+ in water with high selectivity and sensitivity. Therefore, both Zn-MOFs materials are promising luminescent sensors in the detection of target analytes in water.