Supramolecular porphyrin assemblies through amidinium-carboxylate salt bridges and fast intra-ensemble excited energy transfer

Joe Otsuki, Kosyo Iwasaki, Yosuke Nakano, Mitsunari Itou, Yasuyuki Araki, Osamu Ito

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Well-defined supramolecular assemblies of Zn and free-base porphyrins are constructed through the formation of amidinium-carboxylate salt bridges. A one-to-one donor-acceptor pair and a four-to-one antenna-type assembly are investigated. The steady-state and time-resolved fluorescence measurements unequivocally showed that efficient singlet-singlet excited energy transfer from the Zn-porphyrin complex to the free-base porphyrin takes place in these assemblies. Indeed, the observed energy-transfer rates in both types of assemblies are much faster than those the Förster mechanism would suggest, implying the involvement of an intermolecular through-bond mechanism.

Original languageEnglish
Pages (from-to)3461-3466
Number of pages6
JournalChemistry - A European Journal
Volume10
Issue number14
DOIs
Publication statusPublished - 2004 Jul 19

Keywords

  • Energy transfer
  • Porphyrinoids
  • Salt bridges
  • Supramolecular chemistry
  • Through-bond mechanism

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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