A van der Waals porous crystal featuring conformational flexibility and permanent porosity for ultrafast water release

IF 5.9 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Kentaro Maejima, Heishun Zen, Hiroyasu Sato, Eiji Nishibori, Tomoya Enjou, Youhei Takeda, Satoshi Minakata, Eri Hisamura, Ken Albrecht, Yuka Ikemoto, Irene Badía-Domínguez, Juan Sánchez-Rincón, M. Carmen Ruiz Delgado, Yohei Yamamoto, Hiroshi Yamagishi
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Abstract

Flexibility has been pursued enthusiastically in the field of porous crystals for enhancing their adsorption and separation performances. However, flexibility has never been observed among porous crystals sustained thoroughly by van der Waals interactions since flexible motions readily lead to the collapse of the porous architecture. Here we report a van der Waals crystal featuring conformational flexibility as well as permanent microporosity. The single-crystal structure and its structural transition in response to the adsorption of water molecules were unambiguously disclosed by means of electron and X-ray crystal structure analyses. The peripheral aromatic rings of the constituent molecule rotated as increasing the ambient humidity, while the connectivity of the pores was maintained throughout the structural transition. The transformative pores allowed the guest water molecules to move exceedingly quickly through the pores with a time constant of 490 μs. We demonstrated that the quick release of water induced by photothermal heating induced a significant upward bending of a film set above the crystalline powder compared to conventional porous materials. This finding contributes to the future crystal engineering based on van der Waals interactions rather than cohesive bonds. Flexibility in porous crystals can enhance their adsorption and separation performances, however, achieving flexibility in porous crystals sustained solely through van der Waals interactions is challenging given that flexible motions typically lead to framework collapse. Here, the authors present a van der Waals crystal that features both conformational flexibility and permanent microporosity

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来源期刊
Communications Chemistry
Communications Chemistry Chemistry-General Chemistry
CiteScore
7.70
自引率
1.70%
发文量
146
审稿时长
13 weeks
期刊介绍: Communications Chemistry is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the chemical sciences. Research papers published by the journal represent significant advances bringing new chemical insight to a specialized area of research. We also aim to provide a community forum for issues of importance to all chemists, regardless of sub-discipline.
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