Effect of dual fullerenes on lifetimes of charge-separated states of subphthalocyanine - triphenylamine - fullerene molecular systems

Mohamed E. El-Khouly, Sun Hee Shim, Yasuyuki Araki, Osamu Ito, Kwang Yol Kay

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Photoinduced intramolecular electron-transfer events of the newly synthesized subphthalocyanine-tripheny-lamine-fullerene triad (SubPc-TPA-Co 60) and subphthalocyanine-triphenylamine-bisfullerene tetrad (SubPc-TPA-(C60)2) were studied. The geometric and electronic structures of the triad were probed by ab initio B3LYP/3-21G method, which predicts SubPc-TPA.+-C60.- as a stable charge-separated state. The photoinduced events via the excited singlet state of SubPc were monitored by time-resolved emission measurements as well as transient absorption techniques. Efficient charge-separations via the excited states of SubPc were observed with the rates of ∼1010 s _1. Compared with the SubPc - TPA dyad, a long-lived charge-separated state was observed for the SubPc - TPA - C60 triad with the lifetime of the radical ion pairs (τRIP) of 670 ns in benzonitrile. Interestingly, further charge stabilization was achieved in the charge-separated state of SubPc - TPA - (C60)2, in which the τRIP was found to be 1050 ns in benzonitrile.

Original languageEnglish
Pages (from-to)3910-3917
Number of pages8
JournalJournal of Physical Chemistry B
Volume112
Issue number13
DOIs
Publication statusPublished - 2008 Apr 3

ASJC Scopus subject areas

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

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