Two dumbbell cyanostyrene derivatives PBCAN and PBTAN have been designed and prepared. Quantum chemical calculations and optical spectra confirm that two compounds are D-π-A-π-D structures. Both of them show aggregation-induced emission (AIE) characteristic, giving high emission efficiency in solid state. Interestingly, two molecules exhibit distinct fluorescent response to external pressure stimuli. Upon the treatment of grinding, PBCAN exhibits unusual hypsochromic shift of the emission wavelength of 10 nm, while PBTAN shows bathochromic shift of 18 nm. We think that the former might be due to close molecular packing in the initial state, while the latter might be derived from the transformation of π-packing mode from H-aggregate to J-aggregate. The current result is valuable for exploiting structurally similar molecules with distinct MFC characteristics.

设计并制备了两种哑铃型氰基苯乙烯衍生物PBCAN和PBTAN。量子化学计算和光谱证实，两种化合物是D-π-A-π-D结构。它们都显示出聚集诱导发射（AIE）特性，在固态下具有很高的发射效率。有趣的是，两个分子对外部压力刺激表现出不同的荧光反应。经过研磨处理后，PBCAN表现出异常的10nm发射波长的变色位移，而PBTAN表现出18nm的红移。我们认为前者可能是由于在初始状态下分子的紧密堆积，而后者可能是由于H-聚合到J-聚合。目前的结果对于开发具有独特MFC特性的结构相似的分子非常有价值。