3 years ago

Rapid Guest Exchange and Ultra-Low Surface Tension Solvents Optimize Metal–Organic Framework Activation

Rapid Guest Exchange and Ultra-Low Surface Tension Solvents Optimize Metal–Organic Framework Activation
Jialiu Ma, Adam J. Matzger, Antek G. Wong-Foy, Andre P. Kalenak
Exploratory research into the critical steps in metal–organic framework (MOF) activation involving solvent exchange and solvent evacuation are reported. It is discovered that solvent exchange kinetics are extremely fast, and minutes rather days are appropriate for solvent exchange in many MOFs. It is also demonstrated that choice of a very low surface tension solvent is critical in successfully activating challenging MOFs. MOFs that have failed to be activated previously can achieve predicted surface areas provided that lower surface tension solvents, such as n-hexane and perfluoropentane, are applied. The insights herein aid in the efficient activation of MOFs in both laboratory and industrial settings and provide best practices for avoiding structural collapse. An exchange for the better: Activation involving solvent exchange and evacuation is crucial to achieve maximum surface area and gas-storage properties in metal–organic frameworks (MOFs). Porosity is preserved when fast solvent exchange kinetics and ultra-low surface tension solvents are exploited yielding MOFs without structural collapse.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201709187

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