Accession Number:

AD0255803

Title:

CARBON-13 HYPERFINE SPLITTING IN THE ELECTRON SPIN RESONANCE SPECTRA OF SEMIQUINONES AND CYCLOOCTATETRAENE

Descriptive Note:

Corporate Author:

COLUMBIA UNIV NEW YORK DEPT OF CHEMISTRY

Report Date:

1961-04-15

Pagination or Media Count:

1.0

Abstract:

Measurements were performed on the C-13 hyperfine splitting in the electron spin resonance spectra of a series of methyl- and chloro-substituted semiquinones and of the cyclooctatetraene anion radical. The splittings were observed from C-13 nuclei present in natural abundance about 1 the C-13 satellites were distinguished from spurious low-intensity lines arising from sidereaction produced radical impurities by means of careful intensity measurements as well as other techniques. The largest observed C-13 splitting had a magnitude of 1.7 gauss. In the p-benzosemiquinone ion, a previously observed line of low intensity was identified as a splitting arising from C-13 nuclei, and was assigned, on the basis of intensity measurements, to the 4 CH carbon atoms. Splitting constants tentatively identified with the methyl C atoms of the methyl-substituted compounds were in the neighborhood of 1.5 gauss. The splitting in the cyclooctatetraene anion indicates that the 3 sigma bonds attached to a C atom lie in a single plane. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE