Mechanical Tunability via Hydrogen Bonding in Metal–Organic Frameworks with the Perovskite Architecture
dataset
posted on 2014-06-04, 00:00 authored by Wei Li, A. Thirumurugan, Phillip T. Barton, Zheshuai Lin, Sebastian Henke, Hamish H.-M. Yeung, Michael T. Wharmby, Erica
G. Bithell, Christopher J. Howard, Anthony K. CheethamTwo analogous metal–organic
frameworks (MOFs) with the perovskite
architecture, [C(NH<sub>2</sub>)<sub>3</sub>][Mn(HCOO)<sub>3</sub>] (<b>1</b>) and [(CH<sub>2</sub>)<sub>3</sub>NH<sub>2</sub>][Mn(HCOO)<sub>3</sub>] (<b>2</b>), exhibit significantly different
mechanical properties. The marked difference is attributed to their
distinct modes of hydrogen bonding between the A-site amine cation
and the anionic framework. The stronger cross-linking hydrogen bonding
in <b>1</b> gives rise to Young’s moduli and hardnesses
that are up to twice those in <b>2</b>, while the thermal expansion
is substantially smaller. This study presents clear evidence that
the mechanical properties of MOF materials can be substantially tuned
via hydrogen-bonding interactions.
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