Dual Functional Copper(II) Isophthalate Coordination Polymer for Selective Sensing of Fe3+ Ions and Methanol

Abstract

Fluorescent chemosensors are becoming attractive due to their unique features of sensitivity and selective detection of analytes in the aqueous and vapour phases. Inorganic and organic pollutants are of major concern because of their adverse health effects. In this work, a coordination compound [Cu(ISO)2(H2O)2]·DMF 1 (where H2ISO = 2,4-benzenedicarboxylic acid) was synthesized by oven-heating at 100 °C. Compound 1 was characterized using elemental analysis, UV/Visible and Fourier transform infrared (FTIR) spectroscopies, Thermogravimetric analysis (TGA), and Scanning Electron Microscopy (SEM). The compound is thermally stable up to 356 °C. Compound 1 showed excellent fluorescent properties with emission centred at 435 nm. This is attributed to ligand to metal charge transfer (LMCT) arising from the π-electron rich backbone of the free ligand. The compound was further studied for detection of metal cation and volatile organic compounds (VOCs). Results show selective recognition of Fe3+ ions and methanol by drastic quenching of fluorescent intensity. High Stern Volmer constants and low limits of detection makes the compound a viable material for ion and vapour detection.