Photoinduced intramolecular electron-transfer processes in [60]fullerene-(spacer)-N,N-bis(biphenylyl)aniline dyad in solutions

G. Abraham Rajkumar, Atula S.D. Sandanayaka, Kei Ichiro Ikeshita, Mitsunari Itou, Yasuyuki Araki, Yoshio Furusho, Nobuhiro Kihara, Osamu Ito, Toshikazu Takata

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Intramolecular photoinduced charge-separation and charge-recombination processes in a covalently connected C60-(spacer)-N,N-bis(biphenylyl) aniline (C60-spacer-BBA) dyad, in which the center-to-center distance of the electron acceptor and electron donor is 15 Å, have been studied by time-resolved fluorescence and transient absorption methods. The observed low fluorescence intensity and the short fluorescence lifetime of the C60 moiety of the dyad in PhCN and THF indicate that charge separation takes place via the excited singlet state of the C60 moiety at a quite fast rate and a high efficiency. The nanosecond transient absorption spectra in PhCN and THF showed the broad absorption bands at 880 and 1100 nm, which were attributed to C60-spacer-BBA•+. The charge-separated state decays with a lifetime of 330-360 ns in PhCN and THF at room temperature. From temperature dependence of the charge-recombination rate constants, the reorganization energy was evaluated to be 0.77-0.87 eV, which indicates that the charge-recombination process is in the inverted region of the Marcus parabola. With lowering temperature, the contribution of charge separation via the excited triplet state of the C60 moiety increases due to an increase in solvation of C60•--spacer-BBA•+.

本文言語English
ページ(範囲)2428-2435
ページ数8
ジャーナルJournal of Physical Chemistry A
109
11
DOI
出版ステータスPublished - 2005 3 24

ASJC Scopus subject areas

  • 物理化学および理論化学

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