Carbon subsulfide
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| 1,2-Propanediene-1,3-dithione | |
|---|---|
| Other names | Carbon Subsulfide, Tricarbon Disulfide |
| Identifiers | |
| CAS number | [627-34-9] |
| Properties | |
| Molecular formula | C3S2 |
| Molar mass | 100.162 g/mol |
| Appearance | red liquid |
| Density | 1.27 |
| Melting point |
-1°C |
| Boiling point |
90°C |
| Solubility in water | insoluble in water |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Carbon Subsulfide is the chemical compound with the formula C3S2. This deep red liquid is immiscible with water but soluble in organic solvents. It readily polymerizes at room temperature to form a hard black solid.
[edit] Synthesis and structure
C3S2 was discovered by Béla Lengyel,[1] who assigned it an unsymmetrical structure. Later, infrared and Raman spectroscopy showed that the structure is symmetrical with a D∞h point group symmetry,[2] i.e. S=C=C=C=S. This compound is analogous to carbon suboxide whose structure is O=C=C=C=O.
Lengyel first synthesized this compound by passing CS2 vapor through an electric arc with carbon electrodes. This treatment produced a black solution that after filtration and evaporation gave a cherry-red liquid. He determined the molecular mass by cryoscopy. Later preparations of C3S2 include thermolysis of a stream of CS2 in a quartz tube heated to 900 to 1100 ℃ as well as flash vacuum pyrolysis (FVP) of 1,2-dithiole-3-thiones.[3]
[edit] Reactions and occurrence
Among its few known reactions, C3S2 can reacts with bromine to form the cyclic disulfide.[4]:
C3S2 polymerizes under applied pressure to give a black semi-conducting solid. A similar pressure-induced polymerization of CS2 also gives a black semiconducting polymer.
In addition, reactions of C3S2 can yield highly condensed sulfur-containing compound, e.g. the reaction of C3S2 with 2-aminopyridine:
Using microwave spectroscopy, small CnS2 clusters have been detected in interstellar medium.[5] The rotational transitions of these small carbon sulfides molecules matched with the corresponding molecules.
[edit] References
- ^ B. von Lengyel (1893). "Ueber ein neues Kohlenstoffsulfid". Berichte der deutschen chemischen Gesellschaft 26: 2960-2968. doi:.
- ^ Smith, W. H., Leroi, G. E. (1966). "Infrared and Raman Spectra of Carbon Subsulfide". Journal of Chemical Physics 45: 1788-1793. doi:.
- ^ Pedersen, C. T. (1996). "The formation of 1,2-propadiene-1,3-dithione from flash vacuum of 1,2-dithiole-3-thiones". Tetrahedron Letters 27: 4805-4808. doi:.
- ^ Stadlbauer, W., Kappe, T. (1999). "The chemistry of carbon subsulfide". Sulfur Reports 21: 423-445.
- ^ Cernicharo, J., Guelin, M., Hein, H., Kahane, C. (1987). "Sulfur in IRC+10216". Astronomy and Astrophysics 181: L9-L12.
