Structural Control of Metal-Centered Excited States in Cobalt(III) Complexes via Bite Angle and π-π Interactions.

ABSTRACT: Co^III complexes have recently become an important focus in photophysics and photoredox catalysis due to metal-centered excited states with strong oxidizing properties. Optimizing chelate ligand bite angles is a widely used strategy to strengthen metal-ligand interactions in coordination complexes, with the resulting enhanced ligand fields often contributing to extended excited-state lifetimes that are advantageous for photochemical applications. We demonstrate that bite-angle optimization exerts the opposite effect on Co^III polypyridines compared to previously studied transition metal complexes, as polypyridine ligands function as π-donors to Co^III rather than π-acceptors. Our findings reveal two counterintuitive paradigms: while bite-angle optimization wea

SUBMITTER: Yaltseva P 

PROVIDER: S-EPMC12356593 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature