Photoinduced charge separation and charge recombination in [60]fullerene-(benzothiadiazole-triphenylamine) based dyad in polar solvents

Atula S.D. Sandanayaka, Kyohei Matsukawa, Tsutomu Ishi-I, Shuntaro Mataka, Yasuyuki Araki, Osamu Ito

研究成果: Article査読

42 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)19995-20004
ページ数10
ジャーナルJournal of Physical Chemistry B
108
52
DOI
出版ステータスPublished - 2004 12 30

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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