A Concept for Controlling Singlet Oxygen (1δg) Yields Using Nitroxide Radicals: Phthalocyaninatosilicon Covalently Linked to Nitroxide Radicals

Kazuyuki Ishii, Shoji Takeuchi, Shinsuke Shimizu, Nagao Kobayashi

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

In this study, we have investigated the singlet oxygen ( 1Δg) generation mechanism using phthalocyaninatosilicon (SiPc) covalently linked to nitroxide radicals (NRs), and we succeeded in increasing the singlet oxygen quantum yield (Ψ Δ) by linking the NRs. This originates from both an increase in the triplet quantum yield and excited-state lifetimes long enough to utilize photochemical reactions. Because the electron exchange interactions with paramagnetic species were known to result only in very fast excited-state relaxation, leading to a decrease in photochemical reaction yields, this increase in ΨΔ is an unusual and precious example for increasing photochemical reaction yields by electron exchange interactions with paramagnetic species, In addition, our experiments and theoretical analyses show that the spin-selective energy transfer rate constant is not influenced by linking the NRs and can be evaluated by the product of spin-statistical factors and matrix elements between the initial and final states.

Original languageEnglish
Pages (from-to)2082-2088
Number of pages7
JournalJournal of the American Chemical Society
Volume126
Issue number7
DOIs
Publication statusPublished - 2004 Feb 25

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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