31P Hyperfine interaction in a new type of phosphorus-containing iminoxy free radicals. An ESR study
✍ Scribed by Zdzislaw Siatecki; Piotr J. Chmielewski; Adam Jezierski
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 397 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Iminoxy radicals of a new type, having the general formula RC(NO^˙^)P(O)(OEt)~2~, were synthesized and characterized by means of ESR spectroscopy. The presence of two isomers due to the different position of the CNO˙ fragment with respect to the R substituent and the P atom, and the relative stability of the isomers, was established. The influence of the R substituent on the relative population of the isomers was found. The nitrogen hyperfine constants for the isomers differ by about 10%, while the phosphorus hyperfine constant for the less populated isomer is about six time greater, reaching a value of 60 G. A linear correlation was found between the values of this hyperfine constant and Dimroth–Reichardt E~T~(30)solvent parameters. The solvent dependence of the ^31^P hyperfine constant was shown to be stronger than the dependence found for the ^14^N hyperfine constant of nitroxides and iminoxyls.