Issue 10, 2016

Compositional dependence of anomalous thermal expansion in perovskite-like ABX3 formates

Abstract

The compositional dependence of thermal expansion behaviour in 19 different perovskite-like metal–organic frameworks (MOFs) of composition [AI][MII(HCOO)3] (A = alkylammonium cation; M = octahedrally-coordinated divalent metal) is studied using variable-temperature X-ray powder diffraction measurements. While all systems show essentially the same type of thermomechanical response—irrespective of their particular structural details—the magnitude of this response is shown to be a function of AI and MII cation radii, as well as the molecular anisotropy of AI. Flexibility is maximised for large MII and small AI, while the shape of AI has implications for the direction of framework hingeing.

Graphical abstract: Compositional dependence of anomalous thermal expansion in perovskite-like ABX3 formates

Supplementary files

Article information

Article type
Paper
Submitted
24 Sext 2015
Accepted
07 Oct 2015
First published
08 Oct 2015

Dalton Trans., 2016,45, 4169-4178

Author version available

Compositional dependence of anomalous thermal expansion in perovskite-like ABX3 formates

I. E. Collings, J. A. Hill, A. B. Cairns, R. I. Cooper, A. L. Thompson, J. E. Parker, C. C. Tang and A. L. Goodwin, Dalton Trans., 2016, 45, 4169 DOI: 10.1039/C5DT03263F

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