The compound Hg4(AsF6)2 containing mercury in the oxidation state of +½ has been obtained from the reaction of mercury with arsenic pentafluoride in liquid SO2; the Hg42+ ion is shown by X-ray methods to be very nearly linear with Hg–Hg distances of 2·57 and 2·70 Å.
B. D. Cutforth, R. J. Gillespie and P. R. Ireland, J. Chem. Soc., Chem. Commun., 1973, 723a DOI: 10.1039/C3973000723A
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