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Issue 1, 2012
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Postsynthetic ligand exchange as a route to functionalization of ‘inert’ metal–organic frameworks

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Abstract

Herein, we report that the exchange of ligands from an intact metal–organic framework (MOF) can be exploited as a means to introduce functionalized ligands into MOFs under mild conditions. It is shown that ligand exchange can occur with ‘inert’ Zr(IV)-based UiO-66 MOFs in a solvent dependent manner. We call this process postsynthetic exchange (PSE) and show that it provides access to MOFs that are not readily prepared in high quality by solvothermal methods. It was found that ligand exchange can occur between UiO-66 MOFs as monitored by aerosol time-of-flight mass spectrometry (ATOFMS). ATOFMS was used to analyze the chemical composition of microcrystalline MOFs on the single particle level, providing information not available through bulk analysis. PSE is an important postsynthetic approach to the modification of MOFs, and the ligand exchange revealed by ATOFMS requires a re-evaluation of the assumed ‘stability’ of even the most robust MOFs.

Graphical abstract: Postsynthetic ligand exchange as a route to functionalization of ‘inert’ metal–organic frameworks

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Publication details

The article was received on 25 Jun 2011, accepted on 30 Aug 2011 and first published on 13 Sep 2011


Article type: Edge Article
DOI: 10.1039/C1SC00394A
Citation: Chem. Sci., 2012,3, 126-130
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    Postsynthetic ligand exchange as a route to functionalization of ‘inert’ metal–organic frameworks

    M. Kim, J. F. Cahill, Y. Su, K. A. Prather and S. M. Cohen, Chem. Sci., 2012, 3, 126
    DOI: 10.1039/C1SC00394A

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