E.S.R. spectra of substituted pyridine and pyrimidine anion radicals
- 1 January 1967
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 12 (2) , 149-158
- https://doi.org/10.1080/00268976700100201
Abstract
Electron spin resonance spectra were obtained of the 3-nitropyridine, 3,5-dinitropyridine, 2-chloro-5-nitropyridine, 5-nitropyrimidine, 3-acetyl pyridine anion radicals produced electrolytically in dimethyl-sulphoxide solutions. Hyperfine splitting constants were assigned in some cases with the help of molecular orbital calculations. The 3-acetylpyridine anion exists in two isomeric forms, the spectra of which were observed. Ionization of chloride from 2-chloro-5-nitropyridine, 2-chloro-3-nitropyridine, and 2-chloro-5-nitropyrimidine occurred on reduction, yielding the 3-nitropyridine anion from the first two compounds, and the 5-nitropyrimidine anion from the third. Analysis of the data suggests that, for this series of radicals, the σ-π parameter Q cn n is in the range 0 ⩾ Q cn n ⩾ -2·5 gauss.Keywords
This publication has 37 references indexed in Scilit:
- An Electron Spin Resonance Study of the Reduction of Polynitromesitylenes and -durenes1,2Journal of the American Chemical Society, 1966
- Electrolytic Reduction of Cyclooctatetraene1Journal of the American Chemical Society, 1965
- Linewidth Studies in Electron Spin Resonance Spectra : The Para and Ortho Dinitrobenzene AnionsThe Journal of Chemical Physics, 1964
- Analysis of the Electron Spin Resonance Spectra of Aromatic Nitrosubstituted Anion RadicalsThe Journal of Chemical Physics, 1963
- Electron Spin Resonance of Electrolytically Generated Nitrile RadicalsJournal of the American Chemical Society, 1963
- An Electron Spin Resonance Study of the Reaction of Pyridine with Potassium: The Formation of Bipyridyl Negative Ion1Journal of the American Chemical Society, 1961
- Electron Spin Resonance and Polarographic Investigation of Substituted Nitrobenzene Negative IonsJournal of the American Chemical Society, 1961
- Electrochemical Generation of Free Radicals and Their Study by Electron Spin Resonance Spectroscopy; the Nitrobenzene Anion RadicalJournal of the American Chemical Society, 1960
- Studies in Chemotherapy. IV. Sulfanilamidopyrimidines1Journal of the American Chemical Society, 1942
- 3. The condensation of halogeno-pyridines, -quinolines, and -isoquinolines with sulphanilamideJournal of the Chemical Society, 1941