Aggregation-Induced Emission of Acyl Hydrazone Derivatives via Control of Single Bond Rotation
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초록
내용
Aggregation-induced emission (AIE) is an abnormal phenomenon observed in certain organic luminophores, including tetraphenylethylene (TPE) derivatives. Such molecules may exhibit AIE through a mechanism of a restriction of intramolecular rotation (RIR), in which the free rotation of a group in molecules is restricted, and at the same time non-radiative intermolecular interactions (e.g., π-π stacking) are inhibited. In this study, acyl hydrazone derivatives with AIE properties were synthesized. The fluorescence of these acyl hydrazone derivatives were varied with the substitution pattern and the number of substituents. The AIE mechanism was revealed to be the RIR mechanism, which was investigated using various ways – aggregation, amine substitution, and metal ion binding.