Superior thermoelasticity and shape-memory nanopores in a porous supramolecular organic framework

You-Gui Huang, Yoshihito Shiota, Ming-Yan Wu, Sheng-Qun Su, Zi-Shuo Yao, Soonchul Kang, Shinji Kanegawa, Guo-Ling Li, Shu-Qi Wu, Takashi Kamachi, Kazunari Yoshizawa, Katsuhiko Ariga, Mao-Chun Hong () and Osamu Sato ()
Additional contact information
You-Gui Huang: Institute for Materials Chemistry and Engineering, Kyushu University
Yoshihito Shiota: Institute for Materials Chemistry and Engineering, Kyushu University
Ming-Yan Wu: State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science
Sheng-Qun Su: Institute for Materials Chemistry and Engineering, Kyushu University
Zi-Shuo Yao: Institute for Materials Chemistry and Engineering, Kyushu University
Soonchul Kang: Institute for Materials Chemistry and Engineering, Kyushu University
Shinji Kanegawa: Institute for Materials Chemistry and Engineering, Kyushu University
Guo-Ling Li: Institute for Materials Chemistry and Engineering, Kyushu University
Shu-Qi Wu: Institute for Materials Chemistry and Engineering, Kyushu University
Takashi Kamachi: Institute for Materials Chemistry and Engineering, Kyushu University
Kazunari Yoshizawa: Institute for Materials Chemistry and Engineering, Kyushu University
Katsuhiko Ariga: World Premier International (WPI) Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS)
Mao-Chun Hong: State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science
Osamu Sato: Institute for Materials Chemistry and Engineering, Kyushu University

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Flexible porous materials generally switch their structures in response to guest removal or incorporation. However, the design of porous materials with empty shape-switchable pores remains a formidable challenge. Here, we demonstrate that the structural transition between an empty orthorhombic phase and an empty tetragonal phase in a flexible porous dodecatuple intercatenated supramolecular organic framework can be controlled cooperatively through guest incorporation and thermal treatment, thus inducing empty shape-memory nanopores. Moreover, the empty orthorhombic phase was observed to exhibit superior thermoelasticity, and the molecular-scale structural mobility could be transmitted to a macroscopic crystal shape change. The driving force of the shape-memory behaviour was elucidated in terms of potential energy. These two interconvertible empty phases with different pore shapes, that is, the orthorhombic phase with rectangular pores and the tetragonal phase with square pores, completely reject or weakly adsorb N2 at 77 K, respectively.

Date: 2016
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DOI: 10.1038/ncomms11564

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