Ethenedithione
Chemical compound
From Wikipedia, the free encyclopedia
Ethenedithione or ethylenedithone is an unstable chemical substance with formula S=C=C=S made from carbon and sulfur.
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| Names | |
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| IUPAC name
Ethenedithione | |
| Identifiers | |
3D model (JSmol) |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| C2S2 | |
| Molar mass | 88.14 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ethenedithione can exist as a gas at low pressure and high temperature, but is unstable when condensed or under higher pressure.[1]
It can be stabilized as a ligand binding two cobalt atoms.[2]
Other occurrences as a ligand are in TpW(CO)2(C2S2)– and [TpW(CO)2]2Ni(C2S2)2, where Tp is trispyrazolylborate.[3]
Formation
Ethenedithione can be made by the flash vacuum pyrolysis of 2,5-Dithiacyclopentylideneketene.[1]
Also it has been made by dissociative ionization of tetrathiapentalenedione, and then neutralisation of ions produced.[4]
C2S2 is made along with carbon subsulfide and carbon monosulfide, in an electric discharge in carbon disulfide vapour.[5]
Properties
In its ground state it is a triplet state (3Σg−).[6] Ethenedithione can be trapped in a matrix of solid argon without decomposition.[1]
The infrared spectrum contains a prominent line at 1179.3 cm−1 due to asymmetric C=S stretch of the most common isotopes.[1]
Over 60 K, ethenedithione polymerises.[7] Possible polymerisation products include polythiene.[8]