A luminescent zinc(II) coordination polymer as a highly selective and sensitive chemosensor for Fe(III) cation and Cr(VI) anions detection in aqueous solution

Abstract

A double-bent-mixed-ligand supported 2-periodic coordination polymer (CP) {[Zn2(FDA)2(4-abpt)2(H2O)2]}n (1) has been synthesized from the unique combination of a bent furan-2,5-dicarboxylic acid (H2FDA) ligand and a bent 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole (4-abpt) coligand. The CP 1 demonstrates readily dispersible two-dimensional (2D) 2-periodic layer structure and considerable chemostability in aqueous media. Luminescence titration experiments indicate that CP 1 can serve as chemosensors for sensitively and selectively detecting Fe3+ cation, CrO42− and Cr2O72− anions in water solution via an environmentally friendly manner. Besides, the luminescent selective quenching mechanism of CP 1 toward Fe3+ cation, CrO42− and Cr2O72− anions is comprehensively investigated in the light of absorption of the excitation energy of the host framework by individual analytes.