The blue colour and the two-line e.s.r. absorption at 90°K of solutions of sulphur in oleum are ascribed to a planar S4+ ion which is in equilibrium with a yellow S82+ ion and another radical exhibiting a double-headed optical absorption band at 10,600/13,900 cm–1 and a three-line e.s.r. spectrum at 90°K.
W. F. Giggenbach, J. Chem. Soc. D, 1970, 852 DOI: 10.1039/C29700000852
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