A new series of radical-triplet pairs: Modulation of radical-triplet interaction by a counter ion

Luca Maretti, Islam S.M. Saiful, Takashi Kajiwara, Ryo Miyamoto, Yasunori Ohba, Seigo Yamauchi

Research output: Contribution to journalArticlepeer-review

Abstract

Bis-(quinoline-TEMPO)-yttrium-tetraphenylporphyrin complexes having potassium and silver counter cations have been studied by cw-EPR in their ground states and by time-resolved (TR) EPR and two-dimensional (2D) nutation spectroscopy in the excited states after laser excitation. Simulations of the TR-EPR spectra at 30K and at room temperature were made, yielding zero-field splitting parameters D and E, and g values. The parameters obtained together with the nutation frequencies clearly assigned the excited states of the bis-radical complexes having counter cations of potassium and silver as quartet and quintet states, respectively. This result is explained by modulation of radical-triplet interactions by the counter ion due to different sizes of metal ions.

Original languageEnglish
Pages (from-to)1619-1626
Number of pages8
JournalMolecular Physics
Volume104
Issue number10-11
DOIs
Publication statusPublished - 2006 May 20

ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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