Mechanism of Breathing Transitions in Metal–Organic Frameworks

Abstract : We present a multiscale physical mechanism and a stochastic model of breathing transitions, which represent adsorption-induced structural transformations between large-pore and narrow-pore conformations in bistable metal–organic frameworks, such as MIL-53. We show that due to interplay between host framework elasticity and guest molecule adsorption, these transformations on the level of the crystal occur via layer-by-layer shear. We construct a simple Hamiltonian that describes the physics of host–host and host–guest interactions and show that a respective Monte Carlo simulation model qualitatively reproduces the experimentally observed features of breathing transitions.
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Carles Triguero, François-Xavier Coudert, Anne Boutin, Alain Fuchs, Alexander Neimark. Mechanism of Breathing Transitions in Metal–Organic Frameworks. Journal of Physical Chemistry Letters, American Chemical Society, 2011, 2 (16), pp.2033-2037. ⟨10.1021/jz2008769⟩. ⟨hal-02113294⟩

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