Ultrafast Energy Transfer between the 3MLCT State of [RuII(dmb)2(bpy-an)]2+ and the Covalently Appended Anthracene
The Journal of Physical Chemistry A2005Vol. 109(11), pp. 2472–2475
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Jon R. Schoonover, Dana M. Dattelbaum, Anton V. Malko, Victor I. Klimov, Thomas J. Meyer, David J. Styers-Barnett, Erika Z. Gannon, Jeremy C. Granger, W. Steven Aldridge, John M. Papanikolas
Abstract
The time scale for triplet-triplet energy transfer (EnT) between a Ru(II) chromophore and a ligand bound anthracene acceptor in [Ru(II)(dmb)2(bpy-an)]2+ (dmb = 4,4'-dimethyl-2,2-bipyridine; bpy-an = 4-(9-anthrylethylene), 4-methyl-2,2-bipyridine) has been measured using femtosecond transient absorption spectroscopy. The appearance of the anthracene excited state is monitored following photoexcitation to a metal-to-ligand charge transfer (MLCT) state via the pi pi* absorption of the triplet excited state of anthracene. Our time-resolved experiments show the presence of fast, sub-100 ps energy transfer to the anthracene occurring on two characteristic time scales of 23 and 72 ps.
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