Abstract
One new nickel(II)-based coordination polymer (CP), formulated as [Ni(HL)(bpe)1.5(H2O)] (compound 1; H3L = 5-(3,4-dicarboxylphenoxy) nicotic acid; bpe = 1,2-bis (4-pyridyl) ethylene) was successfully synthesized with a fluorescent semi-rigid tricarboxylate ligand H3L. 1 presents a unique 2D layer structure with (3, 4)-connected (4·7·8) (47·48) topology. Fluorescence measurements reveal that 1 exhibits great fluorescence properties and excellent water stability. Significantly, compound 1 could be served as a dual-responsive fluorescent sensor to trace ascorbic acid (AA) and acetylacetone (acac) through fluorescent turn-on and turn-off, respectively. Both proposed sensing systems show good selectivity, sensitivity and anti-interferential performance. The limits of detection (LOD) for AA and acac are found to be 1.23 μM and 3.54 μM, respectively. Furthermore, the possible fluorescence sensing mechanisms have been also discussed in detail by Powder X-ray diffraction (PXRD) pattern, UV–vis spectroscopy and fluorescence lifetime measurements and density functional theory (DFT) calculations.
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