Arsine

Title: Arsine
CAS Registry Number: 7784-42-1
Additional Names: Arsenic trihydride; hydrogen arsenide
Molecular Formula: AsH3
Molecular Weight: 77.95
Percent Composition: As 96.11%, H 3.88%
Literature References: Prepn: Wendt, Landauer, J. Am. Chem. Soc. 42, 930 (1920); Jolly, Drake, Inorg. Synth. 7, 41 (1963); Schenk in Handbook of Preparative Inorganic Chemistry vol 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 593-595. Toxicity: Doig, Lancet 2, 88 (1958); Vallee et al., Arch. Ind. Health 21, 132 (1960).
Properties: Colorless, neutral gas. Disagreeable garlic odor. Very poisonous! mp -117°. bp -62.5°. Dissociation pressure at 0° = 0.806 atm. Decomposes when heated at 300°, depositing arsenic which volatilizes at 400°. On exposure to light, moist arsine decomposes quickly depositing shiny black arsenic. Slightly sol in water. Aq solns are neutral. Traces are best removed by absorption in potassium permanganate soln or in bromine water.
Melting point: mp -117°
Boiling point: bp -62.5°
CAUTION: Potential symptoms of overexposure are headache, malaise, weakness and dizziness; dyspnea; abdominal and back pain; nausea, vomiting; bronze skin; hematuria; jaundice; peripheral neuropathy; direct contact with liquid may cause frostbite. Potential occupational carcinogen. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 20.
Arsonoacetic Acid Arsphenamine Arsthinol Arteether Arteflene

Arsine
Arsine
Arsine-3D-balls.png Arsine-3D-vdW.png
Identifiers
CAS number 7784-42-1 YesY
PubChem 23969
ChemSpider 22408 YesY
EC number 232-066-3
ChEBI CHEBI:47217 YesY
Jmol-3D images Image 1
Properties
Molecular formula AsH3
Molar mass 77.9454 g/mol
Appearance colourless gas
Density 4.93 g/l, gas; 1.640 g/mL (−64 °C)
Melting point −111.2 °C; −168.2 °F; 162.0 K
Boiling point −62.5 °C; −80.5 °F; 210.7 K
Solubility in water 0.07 g/100 ml (25 °C)
Structure
Molecular shape trigonal pyramidal
Dipole moment 0.20 D
Thermochemistry
Std molar
entropy So298
223 J.K−1.mol−1
Std enthalpy of
formation ΔfHo298
+66.4 kJ/mol
Hazards
MSDS External MSDS
EU classification Very flammable (F+)
Highly toxic (T+)
Harmful (Xn)
Dangerous for the environment (N)
R-phrases R12, R26, R48/20, R50/53
S-phrases (S1/2), S9, S16, S28, S33, S36/37, S45, S60, S61
NFPA 704
NFPA 704.svg
4
4
2
Flash point −62 °C; −80 °F; 211 K
Related compounds
Related hydrides Ammonia; Phosphine; Stibine; Bismuthine
Supplementary data page
Structure and
properties
n, εr, etc.
Thermodynamic
data
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Arsine is the inorganic compound with the formula AsH3. This flammable, pyrophoric, and highly toxic gas is one of the simplest compounds of arsenic.[1] Despite its lethality, it finds some applications in the semiconductor industry and for the synthesis of organoarsenic compounds. The term arsine is commonly used to describe a class of organoarsenic compounds of the formula AsH3−xRx, where R = aryl or alkyl. For example, As(C6H5)3, called triphenylarsine, is referred to as "an arsine."