The Electron Paramagnetic Resonance Spectra of α-Substituted Nitrotoluene Anion Radicals. The Influence of Electron-Withdrawing Substituents on the Coupling Constants for β-Hydrogen Atoms

Leon M. Stock, Michael R. Wasielewski

Research output: Contribution to journalLetter

11 Scopus citations


We have obtained new experimental and theoretical information which indicates that electron-withdrawing substituents importantly diminish the magnitude of spin delocalization to β-hydrogen atoms in radicals. These substituent effects are so large that the EPR coupling constants for β-hydrogen atoms, aβ-H, cannot be used without correction to estimate conformational preferences, to detect structural changes such as bridging (distortion), or to guide the experimental assessment of β2 parameters for other β-atoms, such as fluorine.

Original languageEnglish (US)
Pages (from-to)5620-5622
Number of pages3
JournalJournal of the American Chemical Society
Issue number19
StatePublished - Sep 1 1975


ASJC Scopus subject areas

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

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