Metal-organic frameworks (MOFs) are hybrid inorganic/organic crystalline materials with large pores for guest molecule encapsulation that enable myriad applications including drug delivery, energy storage, and gas capture. MOFs can be modified by capping via the attachment of bulky molecules that sterically hinder transfer of guests in and out of the pores to enable trapping and eventual controlled release of guests. Successful capping requires knowledge of chemical species and reactivities at MOF surfaces, and a knowledge gap exists for the UiO family of zirconium-based MOFs. Herein, we hypothesized that the large-pore UiO-67 should be hydroxyl terminated and share similar surface reactivity to silane molecules as the better-studied UiO-66. We tested this hypothesis with silane reactivity and surface science analyses.

Surface modification of zirconium metal-organic framework UiO-67

ACS Spring 2022

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