Mechanical Tunability via Hydrogen Bonding in Metal-Organic Frameworks with the Perovskite Architecture

作者：Li, Wei; Thirumurugan, A.; Barton, Phillip T.; Lin, Zheshuai^*; Henke, Sebastian; Yeung, Hamish H. -M.; Wharmby, Michael T.; Bithell, Erica G.; Howard, Christopher J.; Cheetham, Anthony K.

来源：Journal of the American Chemical Society, 2014, 136(22): 7801-7804.

DOI：10.1021/ja500618z

• PROMINENT DIELECTRIC ANOMALIES
• NEGATIVE THERMAL-EXPANSION
• PHASE-TRANSITIONS
• NANOINDENTATION
• ENERGY
• FERROELECTRICITY

Two analogous metal organic frameworks (MOFs) with the perovskite architecture, [C(NH2)(3)][Mn(HCOO)(3)] (1) and [(CH2)(3)NH2][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.

• 出版日期2014-6-4
• 单位中国科学院理化技术研究所