Dithionate

Dithionate
IUPAC name Dithionate
Systematic name Bis(trioxidosulfate)(S—S)(2-)[1] (additive)
Identifiers
CAS number	14781-81-8
PubChem	3082075
ChemSpider	2339557 Y
ChEBI	CHEBI:29209
Jmol-3D images	Image 1
SMILES [O-]s(:o)(:o)-s([O-])(:o):o
InChI InChI=1S/H2O6S2/c1-7(2,3)8(4,5)6/h(H,1,2,3)(H,4,5,6)/p-2 Key: RMGVZKRVHHSUIM-UHFFFAOYSA-L
Properties
Molecular formula	O6S22-
Molar mass	160.126 g mol-1
Exact mass	159.913629112 g mol-1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

The dithionate anion, S₂O₆²⁻, is a sulfur oxoanion ^[2]} derived from dithionic acid, H₂S₂O₆. Its chemical formula is sometimes written in a semistructural format, as [O₃SSO₃]²⁻.

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.^[3] Aqueous solutions of dithionates are quite stable and can be boiled without decomposition.^[4]

The γ irradiation of crystalline dithionates produces SO₃⁻ radical ions.^[5] The unpaired electron in the SO₃⁻ radical can be detected with electron paramagnetic resonance and barium dithionate has been proposed as the basis for a radiation dosimeter.^[6]

The dithionate ion can act as a bidentate ligand.^[7]

The structure of the dithionate ion in the solid state is staggered in Na₂S₂O₆.2H₂O, whereas in the anyhydrous potassium salt it is nearly eclipsed.^[3]

Compounds

Compounds containing the dithionate ion include:

• sodium dithionate, Na₂S₂O₆
• potassium dithionate, K₂S₂O₆
• barium dithionate, BaS₂O₆

References

1. ^ "Dithionate(2-) (CHEBI:29209)". Chemical Entities of Biological Interest (ChEBI). UK: European Bioinformatics Institute. https://www.ebi.ac.uk/chebi/searchId.do?chebiId=29209. 
2. ^ International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. p. 130. Electronic version.
3. ^ ^{a b} Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419. 
4. ^ Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5 
5. ^ Radiation Chemistry of Dithionates G.S. Murthy, R.L. Eager, and K.J. McCallum Can. J. Chem. 49(22),(1971), 3733
6. ^ 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; doi:10.1093/rpd/nci531
7. ^ Structures of Some Copper (II) Complexes Containing S₂O₆²⁻ Ion Ishii M. Bulletin of the Yamagata University 5, 1,(2001), 7

External links