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The Organic Secondary Building Unit: Strong Intermolecular π Interactions Define Topology in MIT-25, a Mesoporous MOF with Proton-Replete Channels

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posted on 2017-02-27, 00:00 authored by Sarah S. Park, Christopher H. Hendon, Alistair J. Fielding, Aron Walsh, Michael O’Keeffe, Mircea Dincă
The structure-directing role of the inorganic secondary building unit (SBU) is key for determining the topology of metal–organic frameworks (MOFs). Here we show that organic building units relying on strong π interactions that are energetically competitive with the formation of common inorganic SBUs can also play a role in defining the topology. We demonstrate the importance of the organic SBU in the formation of Mg2H6(H3O)­(TTFTB)3 (MIT-25), a mesoporous MOF with the new ssp topology. A delocalized electronic hole is critical in the stabilization of the TTF triad organic SBUs and exemplifies a design principle for future MOF synthesis.

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