Cooperative light-induced breathing of soft porous crystals via azobenzene buckling

Simon Krause (), Jack D. Evans, Volodymyr Bon, Stefano Crespi, Wojciech Danowski, Wesley R. Browne, Sebastian Ehrling, Francesco Walenszus, Dirk Wallacher, Nico Grimm, Daniel M. Többens, Manfred S. Weiss, Stefan Kaskel () and Ben L. Feringa ()
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Simon Krause: University of Groningen
Jack D. Evans: Technische Universität Dresden
Volodymyr Bon: Technische Universität Dresden
Stefano Crespi: University of Groningen
Wojciech Danowski: University of Groningen
Wesley R. Browne: University of Groningen
Sebastian Ehrling: Technische Universität Dresden
Francesco Walenszus: Technische Universität Dresden
Dirk Wallacher: Helmholtz-Zentrum Berlin für Materialien und Energie
Nico Grimm: Helmholtz-Zentrum Berlin für Materialien und Energie
Daniel M. Többens: Helmholtz-Zentrum Berlin für Materialien und Energie
Manfred S. Weiss: Helmholtz-Zentrum Berlin für Materialien und Energie
Stefan Kaskel: Technische Universität Dresden
Ben L. Feringa: University of Groningen

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Although light is a prominent stimulus for smart materials, the application of photoswitches as light-responsive triggers for phase transitions of porous materials remains poorly explored. Here we incorporate an azobenzene photoswitch in the backbone of a metal-organic framework producing light-induced structural contraction of the porous network in parallel to gas adsorption. Light-stimulation enables non-invasive spatiotemporal control over the mechanical properties of the framework, which ultimately leads to pore contraction and subsequent guest release via negative gas adsorption. The complex mechanism of light-gated breathing is established by a series of in situ diffraction and spectroscopic experiments, supported by quantum mechanical and molecular dynamic simulations. Unexpectedly, this study identifies a novel light-induced deformation mechanism of constrained azobenzene photoswitches relevant to the future design of light-responsive materials.

Date: 2022
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DOI: 10.1038/s41467-022-29149-z

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