Institute of Molecular Aggregation Science, Tianjin University, Tianjin 300072, China.
Department of Chemistry, Wuhan University, Wuhan 430072, China.
Mater Horiz. 2022 Feb 7;9(2):731-739. doi: 10.1039/d1mh01360b.
Organic porous crystals constructed by only a single kind of weak molecular interaction are invaluable to understanding the nature of the formation of organic porous materials and developing new types of porous materials. Here, we designed and synthesized two pure organic compounds of PBO and PBS through integrating planar dibenzothiophene/dibenzofuran and two phenothiazine groups together with twisted C-N bonds, which form organic microporous crystals with very good stability against strong acids and bases pure C-H⋯π interactions. Accordingly, the effective absorption of toluene has been successfully realized with an adsorbing capacity of 6.20 mmol g, regardless of the interference of water vapor. Excitingly, these microporous materials exhibit interesting crystal-to-crystal transformation (CCT) properties accompanied by changed pore size on being exposed to different organic vapors. Therefore, the desorption process of toluene could be completed through a simple exposure to dichloromethane (DCM) vapor and the second transformation of the crystal occurred in this process.
仅由单一弱分子相互作用构建的有机多孔晶体对于理解有机多孔材料的形成性质和开发新型多孔材料具有重要意义。在这里，我们通过将平面二苯并噻吩/二苯并呋喃和两个吩噻嗪基团与扭曲的 C-N 键整合在一起，设计并合成了两种纯有机化合物 PBO 和 PBS，形成了具有非常好的酸碱稳定性和纯 C-H··π相互作用的有机微孔晶体。因此，成功地实现了对甲苯的有效吸附，吸附容量为 6.20mmol g，即使水蒸气存在也不受干扰。令人兴奋的是，这些微孔材料在暴露于不同有机蒸气时表现出有趣的晶体-晶体转变（CCT）性质，同时伴随着孔径的变化。因此，通过简单地暴露于二氯甲烷（DCM）蒸气即可完成甲苯的脱附过程，并且在这个过程中发生了第二次晶体转变。
