A Photoluminescent Cd(II) Coordination Polymer with Highly Selective Detection for Nitrophenol

Abstract

A cadmium(II) coordination polymer (CP), namely [Cd(H₂L^2–)(2,2′-bipy)]_n (1) based on 3‑(3′,5′-dicarboxyphenyl)pyridine-2,6-dicarboxylic acid, has been synthesized under hydrothermal conditions. Compound 1 crystallizes in the orthorhombic system Pbca space group and features a 1D infinite Zigzag chain structure, further extending into a 3D supramolecular network through O–H\( \cdots \)O hydrogen bond interactions. CP 1 exhibits highly selective and sensitive luminescent detection for nitrophenol in ethanol solution with quenching efficiency up to 2.84 × 10⁴ M^–1 and a low detection limit of 4.4 μM. Remarkably, CP 1 might be a potential luminescent sensor material for nitrophenol.