Abstract
CHANGES in the electron spin resonance spectra of various carbon1,2 and nitrogen3,4 centred π-radicals on cooling to low temperatures prompted us to re-examine the spectra of the radical NH+2SO−3 trapped in irradiated sulphamic acid5. From the earlier work of Rowlands and Whiffen5 it appears that at 300° K there is rapid re-orientation of the NH+2 group between two equivalent positions, so that the two protons are equivalent for all orientations of the radical in the magnetic field of the spectrometer. At 77° K a marked increase in the magnitude of the hyperfine interaction of the unpaired electron with the 14N nucleus was noted for the orientation H0 parallel to the crystallographic b-axis. It was suggested that this might be due to changes in the radical geometry.
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References
Heller, C., J. Chem. Phys., 36, 175 (1962).
Morton, J. R., J. Chem. Phys., 41, 2956 (1964).
Rowlands, J. R., Mol. Phys., 5, 565 (1962).
Fujimoto, M., and Morton, J. R., Can. J. Chem., 43, 1012 (1965).
Rowlands, J. R., and Whiffen, D. H., Nature, 193, 61 (1962).
Kanda, F. A., and King, A. J., J. Amer. Chem. Soc., 73, 2315 (1951).
Chantry, G. W., Horsfield, A., Morton, J. R., Rowlands, J. R., and Whiffen, D. H., Mol. Phys., 5, 233 (1962).
Roberts, G., and Derbyshire, W., J. Sci. Instr., 38, 511 (1961).
Hornig, A. W., and Hyde, J. S., Mol. Phys., 6, 33 (1963).
Cole, T., J. Chem. Phys., 35, 1169 (1961).
Morton, J. R., Chem. Revs., 64, 453 (1964).
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ATHERTON, N., MORTON, J. Electron Spin Resonance Spectrum of NH+2SO−3. Nature 209, 294–295 (1966). https://doi.org/10.1038/209294a0
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DOI: https://doi.org/10.1038/209294a0
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