3 years ago

Core–Shell Structures Arise Naturally During Ligand Exchange in Metal–Organic Frameworks

Core–Shell Structures Arise Naturally During Ligand Exchange in Metal–Organic Frameworks
Adam J. Matzger, Jake A. Boissonnault, Antek G. Wong-Foy
Examination of the microstructure of metal–organic frameworks (MOFs) after postsynthetic exchange (PSE) reveals that the exchanged ligand is concentrated at the edges of the crystal and decreases in concentration with crystal depth, resulting in a core–shell arrangement. Diffusion studies of the carboxylate ligand into MOF-5 indicate that diffusion is limiting to the exchange process and may ultimately be responsible for the observed core–shell structure. Examination of PSE in UMCM-8 and single crystals of UiO-66 shows a similar trend, illustrating the applicability of PSE as a method for the creation of core–shell MOFs.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b08349

DOI: 10.1021/jacs.7b08349

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