Nature of Anti‐Dissipative High‐Energy Excited States in Quaterpyridine‐Bridged Ruthenium Complexes

Chantry, Noémie;Cotic, Agustina;De Kreijger, Simon;Di Forti, Riccardo;Cadranel, Alejandro;et.al.
(2025) Angewandte Chemie — Vol. 1, n° 1, p. e202507738 (2025)

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Abstract
High-energy excited states with slow rates for internal conversion to the lowest-energy excited state are prone to be intercepted before they dissipate energy to the medium. In a previous report, oligomeric Ru(II) photosensitizers bearing a bridging 2,2’:5’,3’’:6’’,2’’’-quaterpyridine scaffold showed promising anti-dissipative behavior in photoinduced electron transfer reactivity. In here, a range of electron accepting and electron donating substituents were incorporated on the ancillary 2,2’-bipyridine ligands to modulate the excited-state dynamics. This allowed to unambiguously identify the precise nature of high-energy excited states, and derive design guidelines for the achievement of anti-dissipative behavior in oligomeric Ru(II) polypyridines relevant for solar fuels production and photoredox catalysis.
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Chantry, N., Cotic, A., De Kreijger, S., Di Forti, R., Elias, B., Troian-Gautier, L., & Cadranel, A. (2025). Nature of Anti‐Dissipative High‐Energy Excited States in Quaterpyridine‐Bridged Ruthenium Complexes. Angewandte Chemie, 1(1), e202507738. https://doi.org/10.1002/ange.202507738 (Original work published 2025)