1 H N.m.r spectra of dithizone, its 15N-labelled analogue and its alkyl-substituted homologues, as well as the 13C n.m.r spectrum, suggest that dithizone should be regarded as a single species in solution rateher than as the tautomeric equilibrium of thiol and thione forms which has been widely accepted.
A. T. Hutton and H. M. N. H. Irving, J. Chem. Soc., Chem. Commun., 1981, 735 DOI: 10.1039/C39810000735
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