Intramolecular photoinduced processes of newly synthesized dual zinc porphyrin-fullerene triad with flexible linkers

Mohamed E. El-Khouly, Jun Hasegawa, Atsuya Momotake, Mikio Sasaki, Yasuyuki Araki, Osamu Ito, Tatsuo Arai

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Zinc porphyrin-fullerene-zinc porphyrin triad, in which two zinc porphyrin (ZnP) moieties and a fullerene (C60) moiety are linked by flexible bonds and which is intended to be a working model of the photosynthetic antenna-reaction centre, has been newly synthesized. Its photophysical properties have been investigated by both time-resolved emission and transient absorption techniques. Excitation of the zinc porphyrin moiety of the triad induced charge separation, generating the radical ion pair, in which the electron localizes on the C60 moiety and the hole localizes on the zinc porphyrin moiety. In polar solvents, the charge-separated states decayed with lifetimes of 300-600 ns returning to the ground state. Compared with ZnP-C60 dyad, ZnP-C60-ZnP triad showed longer lifetimes for the radical ion pair due to the conformation of the two ZnP moieties. The effects of the coordinating reagents on the zinc atom have been studied, with the expectation of conformational change of the two ZnP moieties with respect to C60.

Original languageEnglish
Pages (from-to)1380-1391
Number of pages12
JournalJournal of Porphyrins and Phthalocyanines
Volume10
Issue number12
DOIs
Publication statusPublished - 2006 Jan 1

Keywords

  • Fullerene
  • Photoinduced electron transfer
  • Zinc porphyrin

ASJC Scopus subject areas

  • Chemistry(all)

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