The hexafluoroarsenate salt of ˙+[graphic omitted]+˙1, prepared by the reaction of S8(AsF6)2, S4(AsF6)2 and (CN)2in SO2, is the only known sterically unhindered non-metal diradical, other than dioxygen, that contains two unpaired electrons in the solid state (µ= 2.81 µB at room temp.).
P. D. Boyle, S. Parsons, J. Passmore and D. J. Wood, J. Chem. Soc., Chem. Commun., 1993, 199 DOI: 10.1039/C39930000199
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