材料科学
多孔介质
吸附
溶剂
结晶度
化学工程
分子
多孔性
无机化学
有机化学
化学
复合材料
工程类
作者
Yi Chen,Xiaojuan Song,Aisen Li,Z. Song,Shiyao Fu,Yujun Xie,Ben Zhong Tang,Zhen Li
标识
DOI:10.1002/adma.202402885
摘要
Abstract Nonporous adaptive crystals (NACs) are crystalline nonporous materials that can undergo a structural adaptive phase transformation to accommodate specific guest via porous cavity or lattice voids. Most of the NACs are based on pillararenes because of their flexible backbone and intrinsic porous structure. Here a readily prepared organic hydrochloride of 4‐(4‐(diphenylamino)phenyl)pyridin‐1‐ium chloride (TPAPyH), exhibiting the solvent dimension‐dependent adaptive crystallinity is reported. Wherein it forms a nonporous α crystal in a solvent with larger dimensions, while forming two porous β and γ crystals capable of accommodating solvent molecules in solvent with small size. Furthermore, the thermal‐induced single‐crystal‐to‐single‐crystal (SCSC) transition from the β to α phase can be initiated. Upon exposure to iodine vapor or immersion in aqueous solution, the nonporous α phase transforms to porous β phase by adsorbing iodine molecules. Owing to the formation of trihalide anion I 2 Clˉ within the crystal cavity, TPAPyH exhibits remarkable performance in iodine storage, with a high uptaking capacity of 1.27 g g −1 and elevated iodine desorption temperature of up to 110 and 82 °C following the first and second adsorption stage. The unexpected adaptivity of TPAPyH inspires the design of NACs for selective adsorption and separation of volatile compound from organic small molecules.
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