Dithionate
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| Names | |||
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| IUPAC name
Dithionate
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| Systematic IUPAC name
Bis(trioxidosulfate)(S—S)(2−)[1] | |||
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3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |||
| S 2O2− 6 | |||
| Molar mass | 160.126 g mol−1 | ||
| Acidity (pKa) | 0.5[2] | ||
| Conjugate acid | Dithionic acid | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The dithionate (or metabisulfate) anion, S
2O2−
6, is a sulfur oxoanion[3] derived from dithionic acid, H2S2O6. Its chemical formula is sometimes written in a semistructural format, as [O3SSO3]2−. It is the first member of the polythionates.
The sulfur atoms of the dithionate ion are in the +5 oxidation state due to the presence of the S–S bond. Generally, dithionates form stable compounds that are not readily oxidised or reduced. Strong oxidants oxidise them to sulfates and strong reducing agents reduce them to sulfites and dithionites.[4] Aqueous solutions of dithionates are quite stable and can be boiled without decomposition.[5]
The γ-irradiation of crystalline dithionates produces SO•−
3 radical ions.[6] The unpaired electron in the SO•−
3 radical can be detected with electron paramagnetic resonance and barium dithionate has been proposed as the basis for a radiation dosimeter.[7]
The dithionate ion can act as a bidentate ligand.[8]
The structure of the dithionate ion in the solid state is staggered in Na2S2O6·2H2O, whereas in the anhydrous potassium salt it is nearly eclipsed.[4]
Compounds
[edit | edit source]Compounds containing the dithionate ion include:
- sodium dithionate, Na2S2O6
- potassium dithionate, K2S2O6
- barium dithionate, BaS2O6
References
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- ^ International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).. p. 130. Electronic version.
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Radiation Chemistry of Dithionates G.S. Murthy, R.L. Eager, and K.J. McCallum Can. J. Chem. 49(22),(1971), 3733
- ^ Barium dithionate as an EPR dosemeter Baran M.P., Bugay O.A., Kolesnik S. P., Maksimenko V. M., Teslenko V. V., Petrenko T. L. Desrosiers M. F. Radiation Protection Dosimetry 2006 120, 202; Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Structures of Some Copper (II) Complexes Containing S
2O2−
6 Ion Ishii M. Bulletin of the Yamagata University 5, 1,(2001), 7
External links
[edit | edit source]Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
