Dihydroxydisulfane
Chemical compound
From Wikipedia, the free encyclopedia
Dihydroxydisulfane or hypodithionous acid is a reduced sulfur oxyacid with sulfur in a formal oxidation state of +1, but the valence of sulfur is 2. The structural formula is HO−S−S−OH, with all atoms arranged in a chain. It is an isomer of thiosulfurous acid but is lower in energy. Other isomers include HOS(=O)SH, HOS(=S)OH, and HS(=O)2SH. Disulfur monoxide, S2O, can be considered as the anhydride.[1] Unlike many of these other reduced sulfur acids, dihydroxydisulfane can be formed in a pure state by reacting hydrogen sulfide with sulfur dioxide at −70 °C in dichlorodifluoromethane.[2]
- H2S + SO2 → H2S2O2
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| Names | |
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| Other names
Hydrogen disulfanediolate; Dihydroxidodisulfur; Disulfanediol | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| 164020 | |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| H2O2S2 | |
| Molar mass | 98.13 g·mol−1 |
| Conjugate base | Disulfanediolate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Dihyroxydisulfane may exist in an equilibrium with thiosulfurous acid.[3]
Organic derivatives such as dimethoxydisulfane,[4] diaceto disulfide,[5] and bis(trifluoroaceto) disulfide[6] also exist.
The conjugate bases are called disulfanediolate HS
2O−
2 and hypodithionite S
2O2−
2.
Properties
Calculations predict that the S−S bond length is 2.013 Å, O−S bond length is 1.645 Å, H−O bond length is 0.943 Å.[7]
Related compounds
Related compounds include the isoelectronic substances hydrogen tetroxide HOOOOH, hydroxotrisulfane HOSSSH, HSOSSH, and tetrasulfane HSSSSH.
