Pore Shape Modification of a Microporous Metal–Organic Framework Using High Pressure: Accessing a New Phase with Oversized Guest Molecules

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• 作者：Scott C. McKellar ; Jorge Sotelo ; Alex Greenaway ; John P. S. Mowat ; Odin Kvam ; Carole A. Morrison ; Paul A. Wright ; Stephen A. Moggach
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：January 26, 2016
• 年：2016
• 卷：28
• 期：2
• 页码：466-473
• 全文大小：465K
• ISSN：1520-5002

文摘

Pressures up to 0.8 GPa have been used to squeeze a range of sterically “oversized” C5–C8 alkane guest molecules into the cavities of a small-pore Sc-based metal–organic framework. Guest inclusion causes a pronounced reorientation of the aromatic rings of one-third of the terephthalate linkers, which act as “torsion springs”, resulting in a fully reversible change in the local pore structure. The study demonstrates how pressure-induced guest uptake can be used to investigate framework flexibility relevant to “breathing” behavior and to understand the uptake of guest molecules in MOFs relevant to hydrocarbon separation.