Selective and Sensitive Detection of Fe 3+ Ions Using a Red-Emissive Fluorescent Probe Based on Triphenylamine and Perylene-Linked Conjugated Microporous Polymer.

The rapid expansion of modern industry underscores the urgent need to address heavy metal pollution, which is a threat to human health and the environment. Efforts are underway to develop precise and cost-effective technologies for detecting heavy metal ions (M + -ion). One promising approach involves the use of conjugated microporous polymers (CMPs) modified with triphenylamine (TPA) and perylene (Peryl), known as TPA-Peryl-CMP, which emits strong red fluorescence. Various analytical techniques, such as BET analysis, Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and thermogravimetric analysis (TGA), were utilized to characterize the synthesized TPA-Peryl-CMP and understand its functional properties. In addition to its remarkable fluorescence behavior, TPA-Peryl-CMP shows promise as a sensor for Fe 3+ ions using a turn-off strategy. Due to its exceptional stability and robust π-electron system, this platform demonstrates remarkable sensitivity and selectivity, significantly improving detection capabilities for specific analytes. Detailed procedures related to the mechanism for detecting Fe 3+ ions were outlined for sensing Fe 3+ ions, revealing a notably strong linear correlation within the concentration range of 0 to 3 µM, with a correlation coefficient of 0.9936 and an LOD of 20 nM. It is anticipated that the development of such a kind of TPA-Peryl-CMP will observe broader applications in the detection of various analytes related to environmental and biological systems, either directly or through further modifications. This article is protected by copyright. All rights reserved.