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Multiple Detection Characteristics of Two Zinc Phosphonates: Syntheses, Crystal Structures, and Luminescent Properties

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journal contribution
posted on 18.08.2019, 18:03 by Hao-Hao Liu, Jie Pan, Zhen-Zhen Xue, Song-De Han, Jin-Hua Li, Guo-Ming Wang
A pair of metal phosphonates, {[(CH3)2NH2]­[Zn2(HEDP)­(BPDC)0.5(H2O)2]·H2O} (1) and {[CH3NH3]­[Zn2(HEDP)­(BPDC)0.5(H2O)2]·3.5H2O} (2) (HEDP = 1-hydroxyethylidene diphosphonate, H2BPDC = biphenyl-4,4′-dicarboxylic acid), have been successfully synthesized by virtue of a dual-ligand strategy. The Zn­(II) centers in both 1 and 2 are bridged by the −PO3 units of HEDP to form 2D inorganic–organic hybrid layers. Adjacent Zn–HEDP layers are further pillared and connected by linear O-containing linkers to furnish 3D pillared-layer architectures showing a (3,4)-connected network. Solid-state photoluminescence studies of compounds 1 and 2 have been performed, displaying intense emissions at 335 and 340 nm under UV light irradiation, respectively. Moreover, luminescence sensing experiments suggest that compound 1 exhibits a great selectivity and sensitivity for detection of Cu2+/Fe3+, IO4/Cr2O72– and nitrobenzene, which could be considered as a promising multiple sensor in an aqueous system.