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Compositional inhomogeneity and tuneable thermal expansion in mixed-metal ZIF-8 analogues

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Abstract

We study the structural and thermomechanical effects of cation substitution in the compositional family of metal–organic frameworks Zn1−xCdx(mIm)2 (HmIm = 2-methylimidazole). We find complete miscibility for all compositions x, with evidence of inhomogeneous distributions of Cd and Zn that in turn affect framework aperture characteristics. Using variable-temperature X-ray powder diffraction measurements, we show that Cd substitution drives a threefold reduction in the magnitude of thermal expansion behaviour. We interpret this effect in terms of an increased density of negative thermal expansion modes in the more flexible Cd-rich frameworks.

Graphical abstract: Compositional inhomogeneity and tuneable thermal expansion in mixed-metal ZIF-8 analogues

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Publication details

The article was received on 25 May 2018, accepted on 01 Aug 2018 and first published on 01 Aug 2018


Article type: Communication
DOI: 10.1039/C8CC04172E
Citation: Chem. Commun., 2018, Advance Article
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    Compositional inhomogeneity and tuneable thermal expansion in mixed-metal ZIF-8 analogues

    A. F. Sapnik, H. S. Geddes, E. M. Reynolds, H. H.-M. Yeung and A. L. Goodwin, Chem. Commun., 2018, Advance Article , DOI: 10.1039/C8CC04172E

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