Abstract
Pure organic luminogens with stimuli-responsive room temperature phosphorescence (RTP) have drawn much attention due to their promising applications in dynamic anti-counterfeiting. In this work, we designed a simple organic molecule with rigid chemical structure (m-FBCM), and all-atom molecular dynamics simulation indicated that it was a potential organogelator. Moreover, the molecule comprises multiple carbonyl units and aromatic rings, which could promote the intersystem crossing process. Our experiments revealed that m-FBCM could form stable gel in DMSO, promoted by balanced intermolecular π-π interactions. Green afterglow was observed at room temperature in the gel state with lifetime 41.6 ms, ascribed to its RTP. The afterglow became invisible at 45 °C and could recover upon cooling to room temperature. Moreover, the N-acylation reaction between m-FBCM xerogel and vapor of volatile primary amine could occur in a few minutes without additional catalyst, providing an orange afterglow. The thermal-responsive and chemical-reponsive properties impart the RTP gel promising application in dynamic anti-counterfeiting.
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