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Chromium(III)-based metal-organic frameworks (Cr-MOFs) are very attractive in a wide range of investigations because of their robustness and high porosity. However, reports on Cr-MOFs are scarce owing to the difficulties in their direct synthesis. Recently developed postsynthetic routes to obtain Cr-MOFs suffered from complicated procedures and a lack of general applicability. Herein, we report a highly efficient and versatile strategy, namely solvent-assisted metal metathesis, to obtain Cr-MOFs from a variety of FeIII-MOFs, including several well-known MOFs and a newly synthesized one, through judicious selection of a coordinating solvent. The versatility of this strategy was demonstrated by producing Cr-MIL-100, Cr-MIL-142A/C, Cr-PCN-333, and Cr-PCN-600 from their FeIII analogues and Cr-SXU-1 from a newly synthesized MOF precursor, Fe-SXU-1, in acetone as the solvent under very mild conditions. We have thus developed a general approach for the preparation of robust Cr-MOFs, which are difficult to synthesize by direct methods. [ABSTRACT FROM AUTHOR]

Robustheit und Porosität machen Chrom(III)‐basierte Metall‐organische Gerüste (Cr‐MOFs) zu verheißungsvollen Materialien, jedoch ist ihre Synthese relativ schwierig. In der Zuschrift auf S. 6578 ff. beschreiben J. H. Wang, X. M. Zhang et al. die Synthese verschiedener Cr‐MOFs aus den entsprechenden Fe‐MOFs durch solvensvermittelten Metallaustausch unter milden Bedindungen. Die effiziente und flexible Methode bietet einen exzellenten Ansatz für die Synthese stabiler MOFs. [ABSTRACT FROM AUTHOR]