Abstract
CONSIDERABLE controversy1–3 has centred around the effect of excess charge on the magnitude of proton coupling constants in such radicals as the cations and anions of aromatic hydrocarbons, benzene, naphthalene and anthracene. Simple theories predict that the coupling constants for cations and corresponding anions should be equal, whereas electron spin resonance results show that the cations always have larger values (Table 1).
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SYMONS, M. Proton Hyperfine Coupling Constants in Radicals and the Excess Charge-effect. Nature 224, 686 (1969). https://doi.org/10.1038/224686a0
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DOI: https://doi.org/10.1038/224686a0
