Fluorene‐Based Conjugated Microporous Polymers: Preparation and Chemical Sensing Application

摘要

Abstract Conjugated microporous polymers (CMPs) with strong fluorescence are great candidates for optoelectronic applications such as photocatalysis and chemical sensing. A series of novel fluorene‐based conjugated microporous polymers (FCMPs) with different electronic structures are prepared by Yamamoto coupling reactions using rationally designed monomers. The FCMPs show a high degree of microporosity, decent specific surface areas, and variable fluorescence. FCMP3, which possesses a triazine knot in the network, exhibits the highest specific surface area of 489 m 2 g ?1 , the largest pore volume of 0.30 cm 3 g ?1 , and the highest solid‐state photoluminescence quantum yield of 11.46. Chemical sensing performance of FCMPs is studied using a range of nitroaromatic compounds as the analytes. Among the FCMPs, FCMP3 exhibits the highest Stern–Volmer constants of 2541, 4708, and 5241 m ?1 for the detection of nitrobenzene, 4‐nitrotoluene, 2,4‐dinitrotoluene, respectively, which are comparable to the detecting efficiency of the state‐of‐the‐art CMP‐based sensing agents.