Electron spin resonance spectrometric study of free radicals in coals
β Scribed by Petrakis, Leon.; Grandy, D. W.
- Book ID
- 121858709
- Publisher
- American Chemical Society
- Year
- 1978
- Tongue
- English
- Weight
- 773 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0003-2700
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The asphaltene of the Athabasca bitumen exhibits a single, structureless e.s.r. signal at a g-value of 2.0032 with an intensity corresponding to approximately one free spin per ninety molecules. From the temperature dependence of the absorption it is concluded that absorption is due to stable polycy
## Abstract Solution and powder ESR spectra of the 4βtrifluoromethylβ1,2,3,5βdithiadiazolyl and 4βpentafluorophenylβ1,2,3,5βdithiadiazolyl free radicals were analysed. Comparison of the ESR parameters with those obtained for the protonated equivalents shows that fluorination produces a drift of unp