Two-photon-absorbing ruthenium complexes enable near infrared light-driven photocatalysis

Guanqun Han, Guodong Li, Jie Huang, Chuang Han, Claudia Turro () and Yujie Sun ()
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Guanqun Han: University of Cincinnati
Guodong Li: University of Cincinnati
Jie Huang: The Ohio State University
Chuang Han: University of Cincinnati
Claudia Turro: The Ohio State University
Yujie Sun: University of Cincinnati

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract One-photon-absorbing photosensitizers are commonly used in homogeneous photocatalysis which require the absorption of ultraviolet (UV) /visible light to populate the desired excited states with adequate energy and lifetime. Nevertheless, the limited penetration depth and competing absorption by organic substrates of UV/visible light calls upon exploring the utilization of longer-wavelength irradiation, such as near-infrared light (λirr > 700 nm). Despite being found applications in photodynamic therapy and bioimaging, two-photon absorption (TPA), the simultaneous absorption of two photons by one molecule, has been rarely explored in homogeneous photocatalysis. Herein, we report a group of ruthenium polypyridyl complexes possessing TPA capability that can drive a variety of organic transformations upon irradiation with 740 nm light. We demonstrate that these TPA ruthenium complexes can operate in an analogous manner as one-photon-absorbing photosensitizers for both energy-transfer and photoredox reactions, as well as function in concert with a transition metal co-catalyst for metallaphotoredox C–C coupling reactions.

Date: 2022
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DOI: 10.1038/s41467-022-29981-3

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