Spin control of the lifetime of an intramolecular charge-transfer excited state.
Triplet-sensitized generation of a long-lived intramolecular charge-separated excited state is described in an electron donor-acceptor molecule with a short distance between the donor and the acceptor. Time-resolved UV-Vis optical absorption spectroscopy shows that the lifetime of this triplet excited state is 1.4 micros in acetonitrile at 298 K, i.e. five orders of magnitude greater than that of the corresponding singlet charge-separated state. In slightly less polar alkane nitrile solvents, the local and CT triplet states coexist, which allows determination of their relative energies.
Hviid
Lene
L
Institute of Molecular Chemistry, University of Amsterdam, Nieuwe Achtergracht 129, 1018 WS Amsterdam, The Netherlands. fred@science.uva.nl
Bouwman
Wim G
WG
Paddon-Row
Michael N
MN
van Ramesdonk
Hendrik J
HJ
Verhoeven
Jan W
JW
Brouwer
Albert M
AM