Spin-spin coupling between the two unpaired electrons in cross-conjugated tetrathiafulvalene dication radicals

Jun Yamauchi, Takuo Aoyama, Katsuichi Kanemoto, Shigeru Sasaki, Masahiko Iyoda

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Spin-spin interactions were examined for bis(tetrathiafulvalenyl) (TTF) derivatives bridged with a 1,1-vinyl group (2,2-diphenyl, 1: 2,2-fluorenylidene, 2; and 2,2-dimethyl, 3). The chemical oxidation of these cross-conjugated TTFs using AgClO4 yielded characteristic seven-line ESR spectra, indicating the exchange interactions between the unpaired electrons on each TTF moiety. Compounds 2 and 3, in addition, exhibited fine structures and half-field resonances in the frozen solutions, which evidence the triplet interaction in the solid state, even with a twisted geometry of the molecular configuration. These findings substantiate the possibility of spin-spin interactions or triplet ground states predicted for some TTF oligomers.

Original languageEnglish
Pages (from-to)197-202
Number of pages6
JournalJournal of Physical Organic Chemistry
Volume13
Issue number4
DOIs
Publication statusPublished - 2000 Apr
Externally publishedYes

Keywords

  • Cation radical
  • Cyclic voltammetry
  • Dimeric TTF
  • ESR
  • Spin-spin interaction
  • X-ray structure analysis

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry

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