Difference between revisions of "Arsenic trisulfide"
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| − | '''Arsenic trisulfide''',As<sub>2</sub>S<sub>3</sub>, is the commonest [[sulfide]] of [[arsenic]]. It occurs naturally as the mineral [[orpiment]], which was an important yellow-orange pigment. | + | '''Arsenic trisulfide''', As<sub>2</sub>S<sub>3</sub>, is the commonest [[sulfide]] of [[arsenic]]. It occurs naturally as the mineral [[orpiment]], which was an important yellow-orange pigment. |
In the solid state, arsenic trisulfide has a layer structure analogous to that of [[arsenic trioxide]], with the arsenic atoms having pyramidal coodination of three sulfur atoms at 224 pm with S–As–S = 99°.<ref name="struct"/><ref name="G&E">{{Greenwood&Earnshaw1st|pages=674–77}}.</ref> It readily sublimes, even below the melting point, and exists as As<sub>4</sub>S<sub>6</sub> molecules in the gas phase.<ref name="G&E"/> | In the solid state, arsenic trisulfide has a layer structure analogous to that of [[arsenic trioxide]], with the arsenic atoms having pyramidal coodination of three sulfur atoms at 224 pm with S–As–S = 99°.<ref name="struct"/><ref name="G&E">{{Greenwood&Earnshaw1st|pages=674–77}}.</ref> It readily sublimes, even below the melting point, and exists as As<sub>4</sub>S<sub>6</sub> molecules in the gas phase.<ref name="G&E"/> | ||
Revision as of 11:20, 23 December 2010
| Arsenic trisulfide | |
|---|---|
| Identifiers | |
| InChI | InChI=1/As2S3/c3-1-5-2-4 |
| Standard InChI | InChI=1S/As2S3/c3-1-5-2-4 |
| CAS number | [] |
| ChemSpider | |
| Properties[1] | |
| Chemical formula | As2S3 |
| Molar mass | 246.04 g mol−1 |
| Appearance | orange solid |
| Density | 3.43 g cm−3 |
| Melting point |
300 °C |
| Boiling point |
707 °C |
| Solubility in water | insoluble |
| Structure[2] | |
| Space group | P21/n |
| Hazards[3] | |
| EU index number | 033-002-00-5 |
| GHS pictograms |  
|
| GHS signal word | DANGER |
| GHS hazard statements | H300, H331, H400, H411 |
| Related compounds | |
| Other anions | Arsenic trioxide Arsenic triselenide |
| Other cations | Phosphorus trisulfide Antimony trisulfide Bismuth sulfide |
| Other compounds | Tetraarsenic tetrasulfide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Arsenic trisulfide, As2S3, is the commonest sulfide of arsenic. It occurs naturally as the mineral orpiment, which was an important yellow-orange pigment.
In the solid state, arsenic trisulfide has a layer structure analogous to that of arsenic trioxide, with the arsenic atoms having pyramidal coodination of three sulfur atoms at 224 pm with S–As–S = 99°.[2][4] It readily sublimes, even below the melting point, and exists as As4S6 molecules in the gas phase.[4]
References
- ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-80. ISBN 0-8493-0462-8.
- ↑ 2.0 2.1 Mullen, D. J. E.; Nowacki, W Refinement of the crystal structures of realgar, AsS and orpiment, As2S3. Z. Kristallogr. 1972, 136, 48–65, <http://rruff.geo.arizona.edu/doclib/zk/vol136/ZK136_48.pdf>.
- ↑ Index no. 033-002-00-5 of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 427.
- ↑ 4.0 4.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 674–77. ISBN 0-08-022057-6.
External links
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See also the corresponding article on Wikipedia. |
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