Tuning the Electrochemical and Photophysical Properties of Osmium-Based Photoredox Catalysts

Abstract

The use of low-energy deep-red (DR) and near-infrared (NIR) light to excite chromophores enables catalysis to ensue across barriers such as materials and tissues. Herein, we report the detailed photophysical characterization of a library of Os^II polypyridyl photosensitizers that absorb low-energy light. By tuning ligand scaffold and electron density, we access a range of synthetically useful excited state energies and redox potentials.

1 Introduction

1.1 Scope

1.2 Measuring Ground-State Redox Potentials

1.3 Measuring Photophysical Properties

1.4 Synthesis of Osmium Complexes

2 Properties of Osmium Complexes

2.1 Redox Potentials of Os(L)₂-Type Complexes

2.2 Redox Potentials of Os(L)₃-Type Complexes

2.3 UV/Vis Absorption and Emission Spectroscopy

3 Conclusions

Key words

photoredox catalysis - near-infrared - ligand design

Publication History

Received: 16 November 2021

Accepted after revision: 29 December 2021

Article published online:
14 January 2022

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