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

摘要

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 Mg_2H)6(H)3O)(TTFTB))3 (MIT-2S), 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.