Excited State Mixed-Valence Complexes: From the Special Pair to the Creutz–Taube Ion and Beyond

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Abstract

Compounds and complexes with mixed-valence electronic ground states, such as the Creutz–Taube ion, have proven to be excellent vehicles through which to study intramolecular electron-transfer processes. In a recent contribution by Cadranel and co-workers, time-resolved pump-probe spectroscopy reveals photo-induced metal-to-bridge charge transfer within the homovalent analogue of the Creutz–Taube ion, [{(NH3)5Ru}(μ-pz){Ru(NH3)5}]4+, giving rise to two closely lying excited states with mixed-valence character, one with a shorter lifetime (τ=136 ps) and weakly-coupled (Robin-Day Class II) character, the other a longer-lived (τ=2.8 ns) configurational isomer with more delocalized electronic structure. Electron transfer reactions from the longer-lived species demonstrate analogies with the photo-induced reactions of the photosynthetic special pair, suggesting this state as a reference system for excited state mixed-valency, and a framework from which to explore photocatalytic reactions.
Original languageEnglish
Article numbere202217082
JournalAngewandte Chemie - International Edition
Volume62
Issue number15
DOIs
Publication statusPublished - Apr 2023

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