Ultrafast energy transfer between the 3MLCT state of [Ru(II)(dmb)2(bpy-an)]2+ and the covalently appended anthracene.
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.
Schoonover
Jon R
JR
Los Alamos National Laboratories, Los Alamos, New Mexico 87545, USA.
Dattelbaum
Dana M
DM
Malko
Anton
A
Klimov
Victor I
VI
Meyer
Thomas J
TJ
Styers-Barnett
David J
DJ
Gannon
Erika Z
EZ
Granger
Jeremy C
JC
Aldridge
W Steven
WS
Papanikolas
John M
JM