Photophysical study of photoinduced electron transfer in a bis-thiophene substituted peryleneimide.
Based on femtosecond time-resolved spectroscopy and single photon timing experiments, intramolecular photoinduced charge transfer has been investigated in two systems containing a peryleneimide chromophore (P) and thiophene (T) groups. The first compound bearing a single thiophene ring (PT1) is used as model and shows a behavior similar to P, studied previously, while in the compound with two thiophene rings attached (PT2) electron transfer from the thiophene donor to the peryleneimide acceptor is observed in benzonitrile. Femtosecond fluorescence upconversion and femtosecond transient absorption experiments in benzonitrile indicate that this ion-pair state formation occurs in 19 ps. This ion-pair state then decays with two time constants of 1400 and 820 ps, probably corresponding to different conformations of the thiophene rings.
Fron
Eduard
E
Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001, Heverlee, Belgium.
Lor
Marc
M
Pilot
Roberto
R
Schweitzer
Gerd
G
Dincalp
Haluk
H
De Feyter
Steven
S
Cremer
Jens
J
Bauerle
Peter
P
Mullen
Klaus
K
Van der Auweraer
Mark
M
De Schryver
Frans C
FC
D004563:Electrochemistry; D004583:Electrons; D007094:Imides / Q000737:chemistry*; D008027:Light; D015394:Molecular Structure; D010084:Oxidation-Reduction / Q000528:radiation effects; D010569:Perylene / Q000031:analogs & derivatives / Q000737:chemistry*; D013876:Thiophenes / Q000737:chemistry*
D007094:Imides; D013876:Thiophenes; D010569:Perylene