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Ultrafast energy transfer between the 3MLCT state of [Ru(II)(dmb)2(bpy-an)]2+ and the covalently appended anthracene.

Research paper by Jon R JR Schoonover, Dana M DM Dattelbaum, Anton A Malko, Victor I VI Klimov, Thomas J TJ Meyer, David J DJ Styers-Barnett, Erika Z EZ Gannon, Jeremy C JC Granger, W Steven WS Aldridge, John M JM Papanikolas

Indexed on: 13 Jul '06Published on: 13 Jul '06Published in: Journal of Physical Chemistry A



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.