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Switching molecular recognition selectivities by temperature in a diffusion-regulatory porous material

Author

Listed:
  • Yan Su

    (South China University of Technology)

  • Ken-ichi Otake

    (Kyoto University)

  • Jia-Jia Zheng

    (Chinese Academy of Sciences)

  • Hong Xu

    (Tsinghua University)

  • Qing Wang

    (ShanghaiTech University)

  • Haiming Liu

    (ShanghaiTech University)

  • Fei Huang

    (ReadCrystal Biotech Co., Ltd.)

  • Ping Wang

    (Sichuan University)

  • Susumu Kitagawa

    (Kyoto University)

  • Cheng Gu

    (South China University of Technology
    Sichuan University)

Abstract

Over the long history of evolution, nature has developed a variety of biological systems with switchable recognition functions, such as the ion transmissibility of biological membranes, which can switch their ion selectivities in response to diverse stimuli. However, developing a method in an artificial host-guest system for switchable recognition of specific guests upon the change of external stimuli is a fundamental challenge in chemistry because the order in the host-guest affinity of a given system hardly varies along with environmental conditions. Herein, we report temperature-responsive recognition of two similar gaseous guests, CO2 and C2H2, with selectivities switched by temperature change by a diffusion-regulatory mechanism, which is realized by a dynamic porous crystal featuring ultrasmall pore apertures with flip-flop locally-motive organic moiety. The dynamic local motion regulates the diffusion process of CO2 and C2H2 and amplifies their rate differences, allowing the crystal to selectively adsorb CO2 at low temperatures and C2H2 at high temperatures with separation factors of 498 (CO2/C2H2) and 181 (C2H2/CO2), respectively.

Suggested Citation

  • Yan Su & Ken-ichi Otake & Jia-Jia Zheng & Hong Xu & Qing Wang & Haiming Liu & Fei Huang & Ping Wang & Susumu Kitagawa & Cheng Gu, 2024. "Switching molecular recognition selectivities by temperature in a diffusion-regulatory porous material," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44424-3
    DOI: 10.1038/s41467-023-44424-3
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