Abstract
Fast and effective volatile acid trifluoroacetic acid (TFA) sensing is urgently demanded environmental safety. Herein, a novel “turn-on” fluorescent chemosensor of tetraphenylethylene (TPE)-planarized bis-Schiff-base was designed and facilely synthesized. The bi-Schiff-based TPE derivative contains two symmetrical terminal naphthalene rings making it nonluminescence. While it exhibited obvious “turn on” fluorescent emission and a real-time visual color changes upon TFA both in solution and vapor phases, respectively. The test paper color change was reversible by the fuming of NH3. Photoluminescence (PL), ultraviolet-visible (UV–vis) absorption spectra and density functional theory (DFT) calculations were employed to investigate the acidichromism mechanism. The fluorescent sensor shows high selectivity and sensitivity for TFA detection. The design of TPE-planarized provide a new strategy for AIE-active “turn-on/off” fluorescence sensors.
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