Spectroscopic investigations into solutions of alkali polysulphides in dimethylformamide showed that the formal oxidation state of the species giving rise to the intense blue colour of these solutions is –½. With the actual charge found to be one half of that of a polysulphide ion, the species is identified as the supersulphide ion, S2–.
W. F. Giggenbach, J. Chem. Soc., Dalton Trans., 1973, 729 DOI: 10.1039/DT9730000729
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