A 3D supramolecular network as highly selective and sensitive luminescent sensor for PO43− and Cu2+ ions in aqueous media

Publication date: March 2018
Source:Dyes and Pigments, Volume 150
Author(s): Yuan Xie, Shigang Ning, Yong Zhang, Zilong Tang, Shaowei Zhang, Ruiren Tang
A 2D coordination polymer, {[Zn(btca)(py)2]}n (1), (H2btca = benzotriazole-5-carboxylic acid, py = pyridine), has been prepared with high yield by the hydrothermal reaction of H2btca and Zn(NO3)2·6H2O in the presence of py, which has been further characterized by kinds of methods combining elemental analysis, thermogravimetric (TG) analysis, infrared (IR) spectrum, powder X-ray diffraction (PXRD), and X-ray single-crystal diffraction. In 1, each Zn²⁺ adopts a five-coordinated pentagonal bipyramid geometry with one O atom from one carboxylate group of btca²⁻ ligand and four N atoms from two btca²⁻ ligands and two py molecules. Adjacent Zn²⁺ are connected by btca²⁻ ligands to generate a 2D layer with the 'fes'-type topology, which could further form a 3D supramolecular network through hydrogen bonds interactions. Furthermore, the luminescent results reveal that the detection limit of 1 as a luminescent sensor to probe Cu²⁺ and PO4³⁻ could reach 3 and 45 ppm, respectively, suggesting that 1 can sensitively and selectively detect Cu²⁺ and PO4³⁻ in aqueous solution.

Graphical abstract

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