Construction of soft porous crystal with silole derivative: strategy of framework design, multiple structural transformability and mechanofluorochromism
作者:J. Mei、J. Wang、A. Qin、H. Zhao、W. Yuan、Z. Zhao、H. H. Y. Sung、C. Deng、S. Zhang、I. D. Williams、J. Z. Sun、B. Z. Tang
DOI:10.1039/c1jm12673c
日期:——
Novel fluorescent organic soft porous crystals have been designed and prepared based on a multi-substituted silole bearing 1-phenyl-2,2-dicyanoethene moieties (molecule 8). 8 exhibited a series of emission colors, ranging from yellow to dark red with an over 70 nm shift of emission maximum. Molecule 8 also showed the ability to reversibly switch between different solid states, and a typical mechanofluorochromism was observed by cyclic operation of the grinding–heating–cooling processes. In addition, two single crystals (O and R) were successfully obtained in proper conditions, and the crystallographic data indicated that crystal O and R had reasonable hollow structures, inside which different solvent molecules were selectively encapsulated. More importantly, we have presented a proof-of-concept example of the strategy for the designation of organic soft porous crystals with a conjugated fluorophore and demonstrated the successful achievement of softness, porosity and crystallization ability. This design strategy is instructive to design and construct organic soft porous crystals with other conjugated building blocks and develop novel smart and stimuli-responsive photo/electronic materials.
以含有 1-苯基-2,2-二氰基乙烯分子的多取代硅烯(分子 8)为基础,设计并制备了新型荧光有机软多孔晶体。分子 8 显示出一系列从黄色到暗红色的发射颜色,发射最大值偏移超过 70 纳米。分子 8 还显示出在不同固态之间可逆切换的能力,通过研磨-加热-冷却过程的循环操作,观察到了典型的机械氟变色现象。此外,我们还在适当的条件下成功获得了两种单晶体(O 和 R),晶体学数据表明,晶体 O 和 R 具有合理的中空结构,不同的溶剂分子被选择性地封装在其中。更重要的是,我们提出了一个概念验证实例,说明了设计带有共轭荧光团的有机软多孔晶体的策略,并证明成功实现了软性、多孔性和结晶能力。这一设计策略对于设计和构建具有其他共轭结构单元的有机软多孔晶体以及开发新型智能和刺激响应型光/电子材料具有指导意义。