Positive exchange interaction in the radical ion pair of benzophenone anion and 1,4-diazabicyclo[2,2,2]octane cation radicals studied by FT-EPR spectroscopy

Shinji Sekiguchi, Kimio Akiyama, Shozo Tero-Kubota

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Electron spin polarization generated from the photoreduction of benzophenone (BP) and its derivatives in the presence of l,4-diazabicyclo[2,2,2]octane (DABCO) was studied in various solvents. The DABCO cation radical obtained showed a CIDEP spectrum with A/E (absorption/emission) polarization by RPM, while other neutral radicals gave an E/A pattern. Using triplet quenchers, it was confirmed that these RPM signals were generated through the triplet reaction process. The present results revealed that the radical ion pair including the BP anion and DABCO + cation radicals has a positive J, while the neutral radical pairs generated under the same condition have a negative J. The sign of J is independent of the polarity of the organic solvents used.

Original languageEnglish
Pages (from-to)161-166
Number of pages6
JournalChemical Physics Letters
Volume263
Issue number1-2
DOIs
Publication statusPublished - 1996 Dec 6

ASJC Scopus subject areas

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

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