Tuning the Electrochemical and Photophysical Properties of Osmium Complexes for Application in Photoredox Catalysis

Photocatalysis driven by visible and ultraviolet irradiation is a fundamental tool for synthetic chemists. Recently, expansion of this tool to near-infrared (NIR) light has gained in popularity. Herein, we report the detailed photophysical characterization of a library of OsII polypyridyl photosensitizers that absorb NIR irradiation. By tuning ligand scaffold and electron density, we access a range of synthetically useful excited state energies and redox potentials.