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• W2097453850 endingPage "2718" @default.
• W2097453850 startingPage "2709" @default.
• W2097453850 abstract "Abstract A star‐shaped Ru/Os tetranuclear complex, in which a central Os unit is linked to three peripheral Ru units by 4,4′′‐azobis(2,2′‐bipyridine) (azobpy) bridging ligands, was prepared to examine the unique photodynamics regulated by its redox state. The Ru/Os tetranuclear complex exhibits Ru‐based luminescence at 77 K, whereas the three‐electron reduction (one for each azobpy) of the Ru/Os complex results in luminescence from the Os unit. The photoexcited state of the Ru/Os complex rapidly decays into low energy metal‐to‐ligand charge‐transfer states, in which the excited electron is localized in the azobpy ligand in the form of azobpy .− . Upon the one‐electron reduction of the azobpy ligands, the above‐mentioned low‐energy states become unavailable to the photoexcited complex. As a result, an energy transfer from the Ru‐based excited state to the Os‐based excited state becomes possible. Ultrafast transient absorption measurements revealed that the energy transfer process consists of two steps; intramolecular electron transfer from the terminal bipyridine ligand (bpy .− ) to form azobpy 2− followed by a metal‐to‐metal electron transfer. Thus, the Ru/Os tetranuclear complex collects light energy into the central Os unit depending on the redox state of the bridging ligands, qualifying as a switchable antenna." @default.
• W2097453850 created "2016-06-24" @default.
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• W2097453850 date "2008-03-07" @default.
• W2097453850 modified "2023-10-17" @default.
• W2097453850 title "Switchable Antenna: A Star-Shaped Ruthenium/Osmium Tetranuclear Complex with Azobis(bipyridine) Bridging Ligands" @default.
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• W2097453850 doi "https://doi.org/10.1002/chem.200701691" @default.
• W2097453850 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18205158" @default.

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