Abstract
RECENTLY Symons1 has considered the influence of the excess charge effect on proton hyperfine coupling constants. He observed that cations always seem to have larger proton hyperfine coupling constants than the analogous anions. This was rationalized as the systematic changing of the effective nuclear charge on the proton with the excess charge on the radical. The series of iso-electronic radicals BH3−, CH3 and NH3+ was used to demonstrate the principle very convincingly.
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References
Symons, M. C. R., Nature, 224, 686 (1969).
Beveridge, D. L., Dobosh, P. A., and Pople, J. A., J. Chem. Phys., 47, 2026 (1967).
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Claxton, T. A., and Smith, N. A., J. Chem. Phys., 52, 4317 (1970).
Claxton, T. A., and McWilliams, D., Trans. Faraday Soc., 66, 513 (1970).
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CLAXTON, T. Proton Hyperfine Coupling Constants in Radicals and the Effect of Orbital Overlap. Nature 226, 1242–1243 (1970). https://doi.org/10.1038/2261242b0
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DOI: https://doi.org/10.1038/2261242b0
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