Abstract
A novel Zn(II)-coordination polymer [Zn(HL)(bpe)0.5]·H2O] (CP 1) (H3L = 4-(2′,3′-dicarboxylphenoxy) benzoic acid, bpe = 1,2-bis(4-pyridyl) ethylene) has been successfully prepared. In CP 1, a dinuclear Zn2(C2OO)4 secondary building unit (SBU) is found, which is further connected by HL2− ligand to induce a two-dimensional (2-D) layer cage structure with (4•52) (4•53•72) topology. CP 1 exhibits excellent fluorescence property. Interestingly, it can also act as a highly efficient fluorescence based sensor for simultaneously detecting acetylacetone (Hacac) and oxoanion Cr(VI) ions with high sensitivity and selectivity in aqueous solution through fluorescence quenching. The detection limits of CP 1 toward Hacac and Cr2O72−, CrO42− are as low as 1.92 ppm, 2.23 μM and 2.57 μM, respectively. Furthermore, the possible sensing mechanism in both proposed sensing systems has also been discussed in more detail.
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