Three Zn(II) coordination polymers as dual‐responsive luminescent probes for highly selective detection of Fe³⁺ cation and MnO₄⁻ anion

Abstract

Effective detection of Fe 3 + cation and MnO 4À anion from water are desirable. As another way to solve this problem, three Znbased luminescent coordination polymers (LCPs), and [Zn(3bpat)(5-mip)](3) (3-bpat = N,N'-bis(3-pyridylamide)-3,4thiophene, 1,3-H 2 bdc = isophthalic acid, 5-H 2 hip = 5-hydroxyisophthalic acid, 5-H 2 mip = 5-methylisophthalic acid), were successfully prepared as optical sensors to detect target analytes. Three LCPs were characterized by single crystal X-ray diffraction, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). Prominently, three LCPs showed good fluorescence quenching response to Fe 3 + cation and MnO 4À anion with high selectivity and sensitivity. The detection limits on Fe 3 + are 1.45 × 10 À 6 M for LCP 1, 2.04 × 10 À 6 M for LCP 2, and 4.25 × 10 À 6 M for LCP 3, respectively. The detection limits on MnO 4 À are 3.93 × 10 À 6 M for LCP 1, 6.62 × 10 À 5 M for LCP 2, and 3.64 × 10 À 6 M for LCP 3, respectively. Furthermore, the quick and accurate probing capability of LCPs 1-3 also have been proved even under nine anions or cations. The possible fluorescence quenching mechanisms were studied, the energy resonance transfer theory were regarded as the primary cause for high efficiency fluorescence quenching.

Zinc(II) Carboxylate Coordination Polymers with Versatile Applications

“…All species showed a good fluorescence quenching response to Fe(III) and MnO 4 − with high selectivity and sensitivity, the DLs for both analytes being in the nanomolar range. Moreover, cation and anion competition experiments indicated that the luminescence quenching response of both analytes were almost unaffected by interfering ions [ 57 ].…”