Multiple decay pathways and electron transfer in excited ion-paired zinc-copper porphyrins: laser photolysis and time-resolved EPR spectroscopy

Muhamad Hugerat, Haim Levanon, Emmanuel Ojadi, Laszlo Biczok, Henry Linschitz

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Oppositely charged zinc and copper porphyrins form ion-paired dimers which show biphasic decay of flash transients in fluid solution. In a glass at low temperature, two photoexcited components are also seen by time-resolved EPR. On the basis of lifetime, absorption spectrum, oxygen sensitivity and EPR spectrum, the long-lived transient is assigned to the zinc porphyrin triplet. The short-lived species is attributed to an ion radical-pair formed by electron transfer from an excited singlet precursor.

Original languageEnglish
Pages (from-to)400-406
Number of pages7
JournalChemical Physics Letters
Issue number5
Publication statusPublished - Jul 5 1991


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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