Carbon sequestration is gaining popularity as a method to reduce the harmful effects of climate change. A strategy being pursued is the reduction of CO2 to a renewable source of fuel, methanol, via homogeneous catalysts. Although examples of noble and earth-abundant catalysts are known there are limitations in the ability to reduce CO2 to methanol. Our approach is to utilize proton responsive moieties to facilitate hydrogen transfer, a key step in the catalysis. Specifically, our group is exploring the use of proton responsive sulfonamide groups as a means to improve CO2 hydrogenation using iron catalysts. Previously, the O’Connor group demonstrated that sulfonamide groups assisted in transfer hydrogenation of aldehydes and ketones using iridium catalysts. We report here the synthesis and characterization of new [PNP] pincer ligands which possess sulfonamides that are based upon the bis(diisopropylphosphino)-2,6-diaminopyridine core (Figure 1). N,N′-Sulfonamido-2,6-diaminopyridines that contain sterically and electronically diverse substituents along with the corresponding phosphine ligands were synthesized and characterized via multinuclear NMR spectroscopy and X-ray crystallography. Progress towards the synthesis of the requisite iron complexes and reactivity studies are also described.

Progress towards the preparation of iron complexes that possess new PNP pincer ligands with proton responsive sulfonamides moieties

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.