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Stable Zinc(II) Coordination Polymer as a Rapid and Highly Sensitive Fluorescence Sensor for the Discriminative
Yue Wang1, Na Xu1, Jianxin Ma1
1College of Chemistry and Materials Engineering, Professional Technology Innovation Center of Liaoning Province for Conversion Materials of Solar Cell, Bohai University, Jinzhou 121013, P. R. China.
Abstract:
A novel two-dimensional bilayer Zn-based luminescent coordination polymer (LCP) [Zn2(μ2-OH)(4-dptp)(3,4',5-bpt)] (LCP 1) [4-dptp = N3,N4-bis(pyridin-4-ylmethyl)thiophene-3,4-dicarboxamide and 3,4',5-H3bpt = biphenyl-3,4',5-tricarboxylic acid] was successfully prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, IR spectroscopy, powder X-ray diffraction, and luminescence spectroscopy. LCP 1 displayed excellent fluorescence-quenching efficiency toward a biomarker 2-(2-methoxyethoxy) acetic acid (MEAA) with a high Ksv (5.153 × 104 M-1), a low limit of detection (0.244 μM), and a rapid response time (28 s). Additionally, LCP 1 can repeatedly detect MEAA at least eight times with excellent stability. The sensing mechanism was also carefully investigated through UV-vis absorption spectroscopy, density functional theory calculations, and fluorescence lifetime analysis.
