Electron-Donating para-Substituent (X) Enhances the Water Oxidation Activity of the Catalyst Ru(4'-X-terpyridine)(phenanthroline-SO₃).

ABSTRACT: Recently, our group has developed a Ru-based water oxidation catalyst (WOC) with pendant sulfonate (1, Ru(4'-X-terpyridine)(phenanthroline-SO₃)OTf (X = H, 1a) that shows high activity under both sacrificial oxidant (CAN, Ce(NH₄)₂(NO₃)₆, Ce^IV) and electrocatalytic conditions, in both acidic and neutral media. Here, we demonstrate that the functionalization of the 4'-X-terpyridine ligand with an electron-donating substituent X = OEt (1b) makes potentials of Ru^II/Ru^III redox catalysis more negative, whereas when X = NO₂ (1c) and CF₃ (1d), potentials are more positive. For 1b, full conversion of the sacrificial oxidant Ce^IV occurred

SUBMITTER: Ibanez MA 

PROVIDER: S-EPMC11863372 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature