Iron-sulfur clusters are a class of biological cofactors found in all clades of life and are capable of a variety of functions including catalysis, sensing, sulfur donation, and electron transport. In biological systems Fe-S clusters are encapsulated by proteins, which house and protect them. Outside of biological systems they retain many of these functions and are an appealing class of earth abundant catalysts. In particular, Fe4S4 cubanes offer desirable features such as the ability to conduct the hydrogen evolution reaction (HER) and CO2 and CO reduction reactions, along with having a reasonably facile synthesis. In order to better study their use as heterogenous catalysts, we report a one-pot method of installing [Fe4S4(SR)4]2- cubanes into thiol-functionalized covalent organic frameworks (COFs). To prove the presence of FeS clusters within the COF material, we conducted Mössbauer spectroscopy, XPS, SEM-EDS, and pXRD.

One-pot installation of Fe4S4 cubanes into covalent organic frameworks

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ACS Fall 2022

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