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Stibine

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Stibine
Stibine
Stibine
Stibine
Stibine
Names
IUPAC name
Stibane
Other names
Antimony trihydride
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.149.507 Edit this at Wikidata
  • InChI=1S/Sb.3H checkY
    Key: OUULRIDHGPHMNQ-UHFFFAOYSA-N checkY
  • InChI=1/Sb.3H/rH3Sb/h1H3
    Key: OUULRIDHGPHMNQ-LQMOCBGJAH
  • [Sb]
Properties
SbH3
Molar mass 124.784 g/mol
Appearance Colourless gas
Density 5.48 g/L, gas
Melting point −88 °C (−126 °F; 185 K)
Boiling point −17 °C (1 °F; 256 K)
slightly soluble
Solubility in other solvents Insoluble
Structure
Trigonal pyramidal
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propaneInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazards (white): no code
4
4
2
Flash point Flammable gas
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.1 ppm (0.5 mg/m3)[1]
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Stibine is the chemical compound with the formula SbH3. This colourless gas is the principal covalent hydride of antimony and a heavy analogue of ammonia. The molecule is pyramidal with H–Sb–H angles of 91.7° and Sb–H distances of 1.707 Å (170.7 pm). This gas has an offensive smell like hydrogen sulfide (rotten eggs).

Preparation

SbH3 is generally prepared by the reaction of Sb3+ sources with H− equivalents:[2]

2 Sb2O3 + 3 LiAlH4 → 4 SbH3 + 1.5 Li2O + 1.5 Al2O3
4 SbCl3 + 3 NaBH4 → 4 SbH3 + 3 NaCl + 3 BCl3

Alternatively, sources of Sb3− react with protonic reagents (even water) to also produce this unstable gas:

Na3Sb + 3 H2O → SbH3 + 3 NaOH

Properties

The chemical properties of SbH3 resemble those for AsH3.[3] Typical for a heavy hydride (e.g. AsH3, H2Te, SnH4), SbH3 is unstable with respect to its elements. The gas decomposes slowly at room temperature but rapidly at 200 °C:

2 SbH3 → 3 H2 + 2 Sb

The decomposition is autocatalytic and can be explosive.

SbH3 is readily oxidized by O2 or even air:

2 SbH3 + 3 O2 → Sb2O3 + 3 H2O

SbH3 exhibits no basicity, but it can be deprotonated:

SbH3 + NaNH2 → NaSbH2 + NH3

Uses

Stibine is used in the semiconductor industry to dope silicon with small quantities of antimony via the process of chemical vapour deposition (CVD). It has also been used as a silicon dopant in epitaxial layers. Reports claim the use of SbH3 as a fumigant but its instability and awkward preparation contrast with the more conventional fumigant phosphine.

History

As stibine (SbH3) is very similar to arsine (AsH3), it is also detected by the Marsh test. This sensitive test detects arsine generated in the presence of arsenic.[3] This procedure, developed around 1836 by James Marsh, is based upon treating a sample with arsenic-free zinc and dilute sulfuric acid: if the sample contains arsenic, gaseous arsine will form. The gas is swept into a glass tube and decomposed by means of heating around 250 – 300 °C. The presence of arsenic is indicated by formation of a deposit in the heated part of the equipment. The formation of a black mirror deposit in the cool part of the equipment indicates the presence of antimony.

In 1837 Lewis Thomson and Pfaff independently discovered stibine. It took some time before the properties of the toxic gas could be determined, partly because a suitable synthesis was not available. In 1876 Francis Jones tested several synthesis methods,[4] but it was not before 1901 when Alfred Stock determined most of the properties of stibine.[5][6]

Safety

SbH3 is an unstable flammable gas. It is highly toxic, with an LC50 of 100 ppm in mice. Fortunately, SbH3 is so unstable that it is rarely encountered outside of laboratories.

Toxicology

For the toxicology of other antimony compounds, see Antimony trioxide.

The toxicity of stibine is distinct from that of other antimony compounds, but similar to that of arsine.[7] Stibine binds to the haemoglobin of red blood cells, causing them to be destroyed by the body. Most cases of stibine poisoning have been accompanied by arsine poisoning, although animal studies indicate that their toxicities are equivalent. The first signs of exposure, which can take several hours to become apparent, are headaches, vertigo and nausea, followed by the symptoms of hemolytic anemia (high levels of unconjugated bilirubin), hemoglobinuria and nephropathy.

See also

References

  1. ^ NIOSH Pocket Guide to Chemical Hazards. "#0568". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ Bellama, J. M.; MacDiarmid, A. G. (1968). "Synthesis of the Hydrides of Germanium, Phosphorus, Arsenic, and Antimony by the Solid-Phase Reaction of the Corresponding Oxide with Lithium Aluminum Hydride". Inorganic Chemistry. 7 (10): 2070–2072. doi:10.1021/ic50068a024.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. ^ a b Holleman, A. F.; Wiberg, E. (2001). Inorganic Chemistry. San Diego: Academic Press.{{cite book}}: CS1 maint: multiple names: authors list (link)
  4. ^ Francis Jones (1876). "On Stibine". Journal of the Chemical Society. 29 (2): 641–650. doi:10.1039/JS8762900641.
  5. ^ Alfred Stock; Walther Doht (1901). "Die Reindarstellung des Antimonwasserstoffes". Berichte der Deutschen Chemischen Gesellschaft. 34 (2): 2339–2344. doi:10.1002/cber.190103402166.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  6. ^ Alfred Stock, Oskar Guttmann (1904). "Ueber den Antimonwasserstoff und das gelbe Antimon". Berichte der Deutschen Chemischen Gesellschaft. 37 (1): 885–900. doi:10.1002/cber.190403701148.
  7. ^ "Fiche toxicologique n° 202 : Trihydrure d'antimoine" (Document). Institut national de recherche et de sécurité (INRS). 1992. {{cite document}}: Unknown parameter |format= ignored (help); Unknown parameter |url= ignored (help)
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