Dithionitronium hexafloroarsenate is the inorganic compound with the formula [SN2]AsF6.

The cation is of interest as the sulfur analogue of nitronium (NO+2).

Hexafloroarsenate is a weakly coordinating anion.

According to X-ray crystallography, S=N=S+ is linear with S-N distances of 146 picometers.

[2] The hexachloroantimonate salt can be prepared by treating thiazyl chloride with sulfur in the presence of antimony pentachloride according to this idealized equation: The dithionitronium cation reacts with nitriles to give dithiadiazolium salts:[3] Addition to alkynes gives dithiazolium salts: