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Synlett 2022; 33(03): 247-258
DOI: 10.1055/s-0041-1737792
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Tuning the Electrochemical and Photophysical Properties of Osmium-Based Photoredox Catalysts

Samantha L. Goldschmid
a   Department of Chemistry, Columbia University, New York, New York 10027, USA
,
Eva Bednářová‡
a   Department of Chemistry, Columbia University, New York, New York 10027, USA
,
Logan R. Beck‡
a   Department of Chemistry, Columbia University, New York, New York 10027, USA
,
Katherine Xie
a   Department of Chemistry, Columbia University, New York, New York 10027, USA
,
Nicholas E. S. Tay
a   Department of Chemistry, Columbia University, New York, New York 10027, USA
,
Benjamin D. Ravetz
a   Department of Chemistry, Columbia University, New York, New York 10027, USA
,
Jun Li
b   Chemical Process Development, Bristol Myers Squibb, New Brunswick, New Jersey 08903, USA
,
Candice L. Joe
b   Chemical Process Development, Bristol Myers Squibb, New Brunswick, New Jersey 08903, USA
,
Tomislav Rovis  ∗
a   Department of Chemistry, Columbia University, New York, New York 10027, USA
› Author AffiliationsE.B. acknowledges the Experientia Foundation for a postdoctoral fellowship. We are grateful to Bristol-Myers Squibb for support.
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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 OsII 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

Supporting Information

    Supporting information for this article is available online at https://doi.org/10.1055/s-0041-1737792.
  • Supporting Information


Publication History

Received: 16 November 2021

Accepted after revision: 29 December 2021

Article published online:
14 January 2022

© 2022. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 

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