In the first part, we employ a two-step strategy for accessing crystalline porous covalent networks of highly conjugated π-electron systems. For this, we first assembled a crystalline metal-organic framework (MOF) precursor based on Zr(IV) ions and linear dicarboxyl linker molecule featuring either crosslinkable aromatic pendants or backfolded, highly unsaturated alkyne side arms (e.g., <b>L1</b>); crosslinking or massive thermocyclization of the organic linkers was then triggered to install highly conjugated, fused-aromatic bridges throughout the MOF scaffold while preserving the crystalline order. The resultant conjugated aromatic network exhibits greatly enhanced stability, electroactivity and charge transport. In the second part, we report breakthrough in the modular synthesis of MOF solids extensively equipped with the mercaptan function, in order to fully exploit the unique metal-uptake, catalytic and electronic properties afforded by the thiol function. The widened access of thiol-equipped MOFs facilitates in-depth exploration of open framework sulfur chemistry, achieving, for instance, fast removal of Hg below the drinking limit of 2 ppb.

Highly conductive and stable metal–organic frameworks from sulfur chemistry for electrocatalysis applications

2019 Fall National Meeting

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