College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, P. R. China.
Soft Matter. 2018 Aug 15;14(32):6737-6744. doi: 10.1039/c8sm01183d.
A novel perylene bisimide (PBI) derivative with an AIE-active diphenylacrylonitrile unit positioned at the terminal N-imide position through a flexible spacer has been synthesized and characterized. The DSC, POM and XRD studies confirmed that it could self-assemble into a stable hexagonal columnar liquid-crystalline phase between 56 °C and 160 °C. This PBI derivative also exhibited strong fluorescence in solution, thin film and mesophase based on the cooperative mechanism of AIE and FRET between the diphenylacrylonitrile group and perylene moiety. The pseudo Stokes shift was as large as 283 nm, and the fluorescence quantum yields were as high as 0.62-0.79 in solution and 0.68-0.86 in solid state. This study provides a good strategy for converting the columnar liquid crystal with ACQ effect to one with the AIE effect, successfully filling the gap between the excellent columnar mesomorphic properties and strong fluorescence in solid state.
一种新型的苝二酰亚胺（PBI）衍生物，通过柔性间隔基将具有聚集诱导发光（AIE）活性的二苯基丙烯腈单元定位在末端 N-酰亚胺位置，已被合成并进行了表征。DSC、POM 和 XRD 研究证实，它可以在 56°C 和 160°C 之间自组装成稳定的六方柱状液晶相。该 PBI 衍生物在溶液、薄膜和介相状态下也表现出很强的荧光，这是基于二苯基丙烯腈基团和苝部分之间的 AIE 和 FRET 协同机制。假斯托克斯位移高达 283nm，荧光量子产率在溶液中高达 0.62-0.79，在固态中高达 0.68-0.86。这项研究为将具有 ACQ 效应的柱状液晶转化为具有 AIE 效应的柱状液晶提供了一个很好的策略，成功填补了优异的柱状介晶性质和固态强荧光之间的空白。
