Arsenic trisulfide
| Arsenic trisulfide | |
|---|---|
| Identifiers | |
| InChI | InChI=1/As4S6/c5-1-6-3-8-2(5)9-4(7-1)10-3 |
| InChIKey | OUFDYFBZNDIAPD-UHFFFAOYAM |
| Standard InChI | InChI=1S/As4S6/c5-1-6-3-8-2(5)9-4(7-1)10-3 |
| Standard InChIKey | OUFDYFBZNDIAPD-UHFFFAOYSA-N |
| CAS number | [] |
| EC number | |
| RTECS | CG2638000 |
| 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 (No. 11) |
| Lattice constant | a = 1147.5(5) pm, b = 957.7(4) pm, c = 425.6(2) pm, α = 90°, β = 90.68(8)°, γ = 90° |
| Coordination geometry | pyramidal (As) |
| Hazards[3][4] | |
| EU index number | 033-002-00-5 |
| GHS pictograms |  
|
| GHS signal word | DANGER |
| GHS hazard statements | H300, H331, H400, H411 |
| PEL (U.S.) | 0.01 mg m−3 TWA (as As) |
| 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][5] It readily sublimes, even below the melting point, and exists as As4S6 molecules in the gas phase.[5]
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.
- ↑ "Inorganic arsenic", 29 C.F.R. § 1910.1018, 58 FR 35310, June 30, 1993, as amended. Arsenic (inorganic compounds, as As). In Pocket Guide to Chemical Hazards; U.S. Department of Health and Human Services (NIOSH) Publication No. 2005-149; Government Printing Office: Washington, DC, 2005. ISBN 9780160727511, <http://www.cdc.gov/niosh/npg/npgd0038.html>.
- ↑ 5.0 5.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 674–77. ISBN 0-08-022057-6.
Further reading
- Arsenic and arsenic compounds. In Overall Evaluations of Carcinogenicity: An Updating of IARC Monographs Volumes 1 to 42; IARC Monographs on the Evaluation of Carcinogenic Risks to Humans Supplement 7; International Agency for Research on Cancer: Lyon, France, 1987; pp 100–6. ISBN 92-832-1411-0, <http://monographs.iarc.fr/ENG/Monographs/suppl7/Suppl7-19.pdf>. Arsenic in Drinking Water. In Some Drinking-water Disinfectants and Contaminants, including Arsenic; IARC Monographs on the Evaluation of Carcinogenic Risks to Humans 84; International Agency for Research on Cancer: Lyon, France, 2004; pp 39–267. ISBN 92-832-1284-3, <http://monographs.iarc.fr/ENG/Monographs/vol84/mono84-6.pdf>.
- Arsenic Compounds, Inorganic. In Report on Carcinogens, Eleventh Edition; U.S. Department of Health and Human Services, Public Health Service, National Toxicology Program, 2005, <http://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s015arse.pdf>.
External links
 |
See also the corresponding article on Wikipedia. |
- UK Poison Information Document
- IPCS Environmental Health Criteria 182: Arsenic
- IPCS Poisons Information Monograph G042: Arsenic
- WHO Food Additives Series 24
- JECFA Evaluation: Arsenic
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