TY - JOUR
T1 - Photoinduced charge separation and charge recombination in [60]fullerene-(benzothiadiazole-triphenylamine) based dyad in polar solvents
AU - Sandanayaka, Atula S.D.
AU - Matsukawa, Kyohei
AU - Ishi-I, Tsutomu
AU - Mataka, Shuntaro
AU - Araki, Yasuyuki
AU - Ito, Osamu
PY - 2004/12/30
Y1 - 2004/12/30
N2 - The molecular dyad C60-(BTD-TPA) consisting of an electron donor triphenylamine-appended 2,1,3-benzothiadiazole chromophore (BTD-TPA) unit covalently linked to an electron acceptor [60]fullerene has been synthesized. The photoinduced electron transfer in C60-(BTD-TPA) has been studied in polar and nonpolar solvents using time-resolved transient absorption and fluorescence measurements. By fluorescence lifetime measurements in picosecond time regions, the excitation of the C60 moiety leads to the formation of C60•--(BTD-TPA)•+ efficiently via the singlet excited state of the C60 moiety. Excitation of the BTD-TPA moiety leads to initial energy transfer to 1C* 60- (BTD-TPA), from which electron transfer occurs to form C 60•--(BTD-TPA)•+. In the nanosecond time region, C60•--(BTD-TPA)•+ in which the radical cation (hole) delocalizes in the BTD-TPA moiety is persistent for 690 ns in DMF at room temperature. From the temperature dependence of the charge-recombination rate constants, which gave the Marcus parameters, we attempted to reveal the origins of long persistent C60 •--(BTD-TPA)•+ in DMF.
AB - The molecular dyad C60-(BTD-TPA) consisting of an electron donor triphenylamine-appended 2,1,3-benzothiadiazole chromophore (BTD-TPA) unit covalently linked to an electron acceptor [60]fullerene has been synthesized. The photoinduced electron transfer in C60-(BTD-TPA) has been studied in polar and nonpolar solvents using time-resolved transient absorption and fluorescence measurements. By fluorescence lifetime measurements in picosecond time regions, the excitation of the C60 moiety leads to the formation of C60•--(BTD-TPA)•+ efficiently via the singlet excited state of the C60 moiety. Excitation of the BTD-TPA moiety leads to initial energy transfer to 1C* 60- (BTD-TPA), from which electron transfer occurs to form C 60•--(BTD-TPA)•+. In the nanosecond time region, C60•--(BTD-TPA)•+ in which the radical cation (hole) delocalizes in the BTD-TPA moiety is persistent for 690 ns in DMF at room temperature. From the temperature dependence of the charge-recombination rate constants, which gave the Marcus parameters, we attempted to reveal the origins of long persistent C60 •--(BTD-TPA)•+ in DMF.
UR - http://www.scopus.com/inward/record.url?scp=11344294878&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=11344294878&partnerID=8YFLogxK
U2 - 10.1021/jp045534r
DO - 10.1021/jp045534r
M3 - Article
AN - SCOPUS:11344294878
VL - 108
SP - 19995
EP - 20004
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 52
ER -