Department of Materials Science and Metallurgy, University of Cambridge , Cambridge CB3 0FS, U.K.
J Am Chem Soc. 2014 Jun 4;136(22):7801-4. doi: 10.1021/ja500618z. Epub 2014 May 20.
Two analogous metal-organic frameworks (MOFs) with the perovskite architecture, [C(NH2)3][Mn(HCOO)3] (1) and [(CH2)3NH2][Mn(HCOO)3] (2), 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 1 gives rise to Young's moduli and hardnesses that are up to twice those in 2, 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.
两种具有钙钛矿结构的类似金属有机骨架（MOFs），[C(NH2)3][Mn(HCOO)3]（1）和[(CH2)3NH2][Mn(HCOO)3]（2），表现出显著不同的力学性能。这种显著的差异归因于它们的 A 位胺阳离子和阴离子骨架之间氢键的不同模式。1 中的交联氢键更强，导致杨氏模量和硬度高达 2 的两倍，而热膨胀则显著较小。这项研究清楚地表明，MOF 材料的力学性能可以通过氢键相互作用进行大幅度调节。
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