A novel fluorescein-bridged perylene bisimide (PBI) dimer for liquid crystal (LC) with geometrically symmetric structure was developed. The mesomorphic results indicated that the energetically stable and unstable conformers of fluorescein fragments could lead to the transformation of mesophases from a hexagonal columnar mesophase to an uncertain phase at 136.9 °C in heating, whilst a stable hexagonal columnar mesophase maintained between 175.6 °C and 58.6 °C in cooling. The selectively excited fluorescence characters in THF solution demonstrated that the fluorescence resonance energy transfer (FRET) effect between fluorescein fragments and PBI unites could provide a means to effectively impose strong fluorescence of the dimeric PBIs modified with suitable chromophore at the N-imide position, which alternatively serves as a platform for the further study of multi-functional PBI-based LCs.

开发了一种新型荧光素桥连苝双酰亚胺 (PBI) 二聚体，用于具有几何对称结构的液晶 (LC)。介晶结果表明，荧光素片段的能量稳定和不稳定构象异构体可导致中间相在 136.9 °C 加热时从六方柱状中间相转变为不确定相，而稳定的六方柱状中间相则保持在 175.6 至 58.6 ℃之间。 °C 冷却。THF 溶液中选择性激发的荧光特性表明，荧光素片段和 PBI 单元之间的荧光共振能量转移 (FRET) 效应可以提供一种手段，有效地在 N-酰亚胺位置用合适的发色团修饰的二聚体 PBI 施加强荧光，