Design and development of benzofuran derived pH-responsive AIEgens: applications in monitoring the urea content in soil and food quality evaluation Satyajit Saha, Gauravi Yashwantrao Department of Speciality Chemicals Technology,Institute of Chemical Technology, Mumbai, India The stimuli-responsive luminescent materials have received particular attention because of the modulable physicalor chemical properties under the influence of external stimuli such as pH, temperature, light, heat, pressure, etc. Therefore, such materials have potential applications in mechano-sensing devices, security inks, memory devices, data storage, deformation detectors, etc. We present here the design and synthesis of three pH-responsive luminogens L1-L3 with aggregation-induced emissive properties built over the benzofuran scaffold. The AIE active luminogens L1-L3 demonstrated reversible fluorescence switching when exposed to Trifluoroacetic acid (TFA) fumes followed by Triethylamine (TEA) or NH3 fumes. The pH-sensitive fluorescence behavior of L2 has been successfully used in developing fluorescent inks for anti-counterfeit applications, as well as to construct paper strip-based detecting tools for qualitatively detecting the urea content in the soil and evaluating the ripeness/maturity of the packed fruits (grapes) in a non-destructive manner. Furthermore, both L1 and L2were found to be highly biocompatible and well internalized within the cytoplasm of MDA-MB-231 cancer cells,with very high fluorescence intensity. References 1. Dyes and Pigments 2023, 220, 111646
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