Photoinduced electron transfer processes in three component rotaxanes with porphyrins, [60]fullerene and triphenylamine

Hisahiro Sasabe, Yoshio Furusho, Atula S.D. Sandanayaka, Yasuyuki Araki, Nobuhiro Kihara, Kazuhiko Mizuno, Akiya Ogawa, Toshikazu Takata, Osamu Ito

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Electron transfer processes occurring through-space and through-bond were studied for novel mechanically linked triad [2]rotaxanes, which contain a porphyrin (MP) unit as a pendant and [60]fullerene (C60) and triphenylamine (TPA) moieties as stopper groups at the axle ends (abbreviated as (MP;C60-TPA)rot+ with MP = H2P or ZnP. The photophysical properties were investigated by means of time-resolved fluorescence and transient absorption measurements with changing solvent polarity. The charge separation took place mainly via (1MP*; C60-TPA)rol+ and (MP;1C60*- TPA)rot+ in polar solvents. Within the charge-separated states of triads (MP;C60-TPA)rol+, hole-shift and/or back electron transfer took place competitively. The lifetime of the charge separation state of (ZnP;C60-TPA)rol+ was similar to that of dyad (C 60-TPA)rol+ (140 ns in dimethylformamide), whereas that of (H2P;C60-TPA)rol+ was as long as 230 ns, suggesting two final charge separation states such as (MP;C60 •-TPA•+)rot+ and (MP •+;C60•--TPA)rot+ depending on the kind of porphyrin.

Original languageEnglish
Pages (from-to)1346-1359
Number of pages14
JournalJournal of Porphyrins and Phthalocyanines
Volume10
Issue number12
DOIs
Publication statusPublished - 2006 Jan 1

Keywords

  • Fullerene
  • Photoinduced electron transfer
  • Porphyrin
  • Rotaxane
  • Triphenylamine

ASJC Scopus subject areas

  • Chemistry(all)

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