Linker Exchange via Migration along the Backbone in Metal–Organic FrameworksClick to copy article linkArticle link copied!
- Nader Al DanafNader Al DanafDepartment of Chemistry and Center for NanoScience, University of Munich, Butenandtstraße 5-13, 81377 Munich, GermanyMore by Nader Al Danaf
- Waldemar SchrimpfWaldemar SchrimpfDepartment of Chemistry and Center for NanoScience, University of Munich, Butenandtstraße 5-13, 81377 Munich, GermanyMore by Waldemar Schrimpf
- Patrick HirschlePatrick HirschleDepartment of Chemistry and Center for NanoScience, University of Munich, Butenandtstraße 5-13, 81377 Munich, GermanyMore by Patrick Hirschle
- Don C. LambDon C. LambDepartment of Chemistry and Center for NanoScience, University of Munich, Butenandtstraße 5-13, 81377 Munich, GermanyMore by Don C. Lamb
- Zhe Ji*Zhe Ji*[email protected]Department of Chemistry, University of California-Berkeley, Berkeley, California 94720, United StatesMore by Zhe Ji
- Stefan Wuttke*Stefan Wuttke*[email protected]Department of Chemistry and Center for NanoScience, University of Munich, Butenandtstraße 5-13, 81377 Munich, GermanyBCMaterials (Basque Center for Materials, Applications & Nanostructures), Building Martina Casiano, 3rd Floor, Barrio Sarriena s/n, 48940 Leioa, SpainIKERBASQUE, Basque Foundation for Science, 48009 Bilbao, SpainMore by Stefan Wuttke
Abstract
In metal–organic frameworks (MOFs), organic linkers are subject to postsynthetic exchange (PSE) when new linkers reach sites of PSE by diffusion. Here, we show that during PSE, a bulky organic linker is able to penetrate narrow-window MOF crystals. The bulky linker migrates by continuously replacing the linkers gating the otherwise impassable windows and serially occupying an array of backbone sites, a mechanism we term through-backbone diffusion. A necessary consequence of this process is the accumulation of missing-linker defects along the diffusion trajectories. Using fluorescence intensity and lifetime imaging microscopy, we found a gradient of missing-linker defects from the crystal surface to the interior, consistent with the spatial progression of PSE. Our success in incorporating bulky functional groups via PSE extends the scope of MOFs that can be used to host sizable, sophisticated guest species, including large catalysts or biomolecules, which were previously deemed only incorporable into MOFs of very large windows.
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