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Shape-memory nanopores induced in coordination frameworks by crystal downsizing.

Yoko Sakata1, Shuhei Furukawa, Mio Kondo

  • 1World Premier International Research Initiative-Institute for Integrated Cell-Material Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.

Science (New York, N.Y.)
|January 12, 2013
PubMed
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Crystal downsizing of flexible porous coordination polymers induces a shape-memory effect. This process stabilizes unique empty phases, enabling switchable sorption properties and gate-opening behavior in advanced materials.

Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Flexible porous coordination polymers exhibit dynamic structural changes upon guest molecule interaction.
  • These materials typically recover their original structure after guest removal, a property crucial for recyclability.

Purpose of the Study:

  • To investigate the impact of crystal downsizing on the structural flexibility and sorption properties of twofold interpenetrated coordination frameworks.
  • To explore the induction of a shape-memory effect in these materials through controlled structural modification.

Main Methods:

  • Fabrication of [Cu(2)(dicarboxylate)(2)(amine)](n) coordination frameworks.
  • Controlled downsizing of crystals to the mesoscale.
  • Characterization of structural phases and sorption behaviors using thermal treatment and guest molecule interactions.

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Main Results:

  • Crystal downsizing regulated structural flexibility and induced a shape-memory effect.
  • An unusual, metastable open dried phase was isolated upon mesoscale downsizing.
  • Thermal treatment recovered the closed phase, demonstrating interconvertibility between empty phases.

Conclusions:

  • Downsizing suppressed structural mobility, stabilizing the open dried phase.
  • The isolation of two interconvertible empty phases (closed and open dried) enables switchable sorption properties.
  • These findings offer new strategies for designing coordination frameworks with tunable gate-opening behaviors.