Switchable antenna: a star-shaped ruthenium/osmium tetranuclear complex with azobis(bipyridine) bridging ligands

Chemistry : a European Journal
Joe OtsukiShunichi Fukuzumi

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...Continue Reading

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Citations

Sep 5, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·J Pérez-MiqueoZ Freixa
Jun 4, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Baptiste Laramée-MiletteGarry S Hanan
Aug 9, 2017·Chemical Communications : Chem Comm·Baptiste Laramée-Milette, Garry S Hanan
Nov 6, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Mathieu E Walther, Oliver S Wenger
Apr 15, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul MurrayLesley J Yellowlees
Jul 3, 2010·Chemical Communications : Chem Comm·Noriko FujimotoHisako Sato
Oct 22, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul R MurrayLesley J Yellowlees
Mar 21, 2012·Chemical Communications : Chem Comm·Masafumi YanoHiroshi Tsukube
Jan 29, 2010·Journal of the American Chemical Society·Troy E Knight, James K McCusker

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