Direct EPR detection of a hydrogen-bonded complex between a semiquinone radical anion and a protonated amino acid, and electron transfer driven by hydrogen bonding

Junpei Yuasa, Shunsuke Yamada, Shunichi Fukuzumi

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Strong hydrogen bonding in a complex of a semiquinone radical anion and protonated histidine (His·2 H+), detected for the first time by EPR spectroscopy during photoinduced electron transfer from 10,10′-dimethyl-9,9′-biacridine (D) to 1-(p-tolylsulfinyl)-2,5- benzoquinone in the presence of His·2 H+ (picture, top), was revealed by the presence in the EPR spectrum (picture, bottom) of superhyperfine splitting caused by the NH3+ group. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)3553-3555
Number of pages3
JournalAngewandte Chemie - International Edition
Volume46
Issue number19
DOIs
StatePublished - 2007

Keywords

  • Amino acids
  • EPR spectroscopy
  • Electron transfer
  • Hydrogen bonds
  • Quinones

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