In 2021, our group published a water oxidation catalyst Ru(4'-X-terpy)(phenanthroline-SO<sub>3</sub>) OTf (X = H) with active-site sulfonate that is very active both using sacrificial oxidant as well as under electrocatalytic conditions. Being able to perform water oxidation with high TON and TOF at both acidic and basic pH is a desirable characteristic that allows the catalyst to be studied in a range of conditions. Acidic conditions are of particular interest, because proton reduction is easier in acid. In this presentation, we demonstrate the effects electron-donating and -withdrawing groups X have on oxidation potentials under both acidic (pH = 1) and basic (pH = 7) conditions. We have previously reported an increase in electrocatalytic activity for X = OEt at pH 7, whereas we now discuss how the catalysts perform under acidic conditions compared to the unsubstituted terpyridine analog with X = H. Studies directed toward identifying intermediates will also be presented.

Further studies on the effects of electron-donating and -withdrawing groups on water oxidation catalysts with phenathrolinesulfonate and terpyridine ligands on ruthenium

Fall 2022 abstracts, posters, and presentations will launch in mid-September.

ACS Fall 2022

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