Polyether-bridged sexithiophene as a complexation-gated molecular wire for intramolecular photoinduced electron transfer.
The porphyrin-sexithiophene-fullerene triad 2, where the two central thiophene units of the sexithiophene spacer are bridged with a crown-ether-like polyether chain, undergoes efficient intramolecular electron transfer from the photoexcited porphyrin moiety to the fullerene through the sexithiophene. However, complexation with a sodium cation in the crown ether ring causes complete suppression of electron transfer as a result of a drastic conformational change of the sexithiophene backbone. Furthermore, decomplexation resumes the photoinduced electron transfer. This on/off switching phenomenon indicates that the polyether-bridged sexithiophene can function as a complexation-gated molecular wire.
Oike
Takuro
T
Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
Kurata
Tomoyuki
T
Takimiya
Kazuo
K
Otsubo
Tetsuo
T
Aso
Yoshio
Y
Zhang
Huimin
H
Araki
Yasuyuki
Y
Ito
Osamu
O