Switchable gate-opening effect in metal–organic polyhedra assemblies through solution processing

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  • 日下, 心平
    Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University
  • 松田, 亮太郎
    Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University
  • 北川, 進
    Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University
  • 古川, 修平
    Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University
  • Kitagawa, Susumu
    Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University
  • Furukawa, Shuhei
    Institute for Integrated Cell-Material Science (WPI-iCeMS), Kyoto University･Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University

抄録

Gate-opening gas sorption is known for metal–organic frameworks, and is associated with structural flexibility and advantageous properties for sensing and gas uptake. Here, we show that gate-opening is also possible for metal–organic polyhedra (MOPs), and depends on the molecular organisation in the lattice. Thanks to the solubility of MOPs, several interchangeable solvatomorphs of a lantern-type MOP were synthesised via treatment with different solvents. One phase obtained through use of methanol induced a gate-opening effect in the lattice in response to carbon dioxide uptake. The sorption process was thoroughly investigated with in situ powder X-ray diffraction and simultaneous adsorption experiments. Meanwhile, solution processing of this flexible phase using THF led to a permanently porous phase without a gate-opening effect. Furthermore, we find that we can change the metallic composition of the MOP, and yet retain flexibility. By showing that gate-opening can be switched on and off depending on the solvent of crystallisation, these findings have implications for the solution-based processing of MOPs.

収録刊行物

  • Chemical Science

    Chemical Science 9 (31), 6463-6469, 2018-08-31

    Royal Society of Chemistry (RSC)

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