Syntheses, Crystal Structures and Exceptionally Selective Detection of Picric Acid of Two Luminescent d10 Metal-Organic Frameworks

Two coordination polymers, namely [Zn(BIDPT)(aba)](n) (1) and [Cd(BIDPT)(HOABDC)](n) (2) (BIDPT=4,4'-bis(imidazol-l-yl)diphenyl thioether, H(2)aba=4,4'-azanediyldibenzoic acid, H(3)OABDC=5-oxyacetate isophthalic acid) have been solvothermally synthesized and characterized by infrared spectroscopy, elemental analysis, and powder X-ray diffraction. In 1, the Zn(II) ions are linked by BIDPT and aba(2-) ligands to give a 2-fold interpenetrating 3D frameworks with {6(6)} dia topology. Compound 2 can be viewed as a 3-connected hcb net with the point symbol of {6(3)} and extended into a three-dimensional supramolecule through hydrogen bonds. Complexes 1 and 2 show strong luminescence and their luminescence could be quenched by a series of nitroaromatic explosives. Importantly, they exhibit very highly sensitive and selective detection of picric acid compared to other nitroaromative explosives. The quenching mechanisms are also deeply studied. CCDC: 1538448, 1; 1416600, 2.