The synthesis of triazine‐based conjugated microporous polymers via nucleophilic substitution reactions for fluorescence sensing to o‐nitrophenol

Abstract

AbstractO‐nitrophenol (o‐NP) is a toxic substance that pollutes the environment and harms human health. Therefore, the development of materials for the efficient detection of o‐NP has attracted the attention of researchers in recent years. Triazine‐based porous organic materials are a kind of porous polymer materials with broad application prospects because of their physical and chemical stability. In this paper, two triazine‐based conjugated microporous polymers (CMPs) containing π‐π conjugated structures, TDAPT and HDAPT, are prepared by nucleophilic substitution reactions with the yields of 89.9% and 67.7%, respectively. Through a series of characterization, it is found that both triazine‐based CMPs have good chemical and thermal stabilities, and high pore properties, and their Brunauer–Emmett–Teller (BET) surface areas are as high as 1314 and 1315 m2 g−1, respectively. At the same time, the fluorescence sensing abilities of TDAPT and HDAPT are studied. The results show that both TDAPT and HDAPT have high sensitivities to o‐NP, their KSV values are 9.8 × 103 and 9.7 × 103 L mol−1 and limits of detection (LODs) are 7.42 × 10−11 and 8.17 × 10−11 mol L−1, respectively. The fluorescence quenching of TDAPT by o‐NP is only caused by the electron transfer mechanism, while the fluorescence quenching of HDAPT by o‐NP has both the electron transfer mechanism and the energy transfer mechanism.