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Date: 19-12-2015
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Date: 27-4-2019
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Date: 27-4-2019
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Dithionic acid, H2S2O6
Dithionic acid is another sulfur oxoacid that is only known in aqueous solution (in which it behaves as a strong acid) or in the form of salts containing the dithionate, [S2O6]2-, ion. Such salts can be isolated as crystalline solids and Figure 15.17a shows the presence of a long S_S bond; the anion possesses a staggered conformation in the solid state. The dithionate ion can be prepared by controlled oxidation of [SO3]2- (equations 1.1 and 1.2), but not by the reduction of [SO4]2- (equation 1.3).
The [S2O6]2- can be isolated as the soluble salt BaS2O6, which is easily converted into salts of other cations.
(1.1)
(1.2)
Fig. 1.1(a) The structure of [S2O6]2- showing the staggered conformation; from the salt [Zn{H2NNHC)O(Me}3][S2O6]. 2.5H2O [I.A. Krol et al. (1981) Koord. Khim., vol. 7, p. 800]; (b) the C2 structure of gas-phase H2SO4. Colour code: S, yellow; O, red; H, white.
(1.3)
The [S2O6]2_ ion is not easily oxidized or reduced, but in acidic solution it slowly decomposes according to equation 1.4, consistent with there being a weak S_S bond.
(1.4)
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