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Antimony tetroxide

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Antimony tetroxide
Names
IUPAC name antimony(III,V) oxide
Identifiers
CAS Number
ECHA InfoCard 100.014.161 Edit this at Wikidata
CompTox Dashboard (EPA)
Properties
Chemical formula SbO2; Sb2O4
Molar mass 153.7588; 307.5176 g/mol
Appearance white solid
Density 6.64 g/cm (orthorhombic form)
Melting point dec.
Boiling point dec.
Solubility in water insoluble
Refractive index (nD) 2.0
Structure
Crystal structure orthorhombic
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2 1 0
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Antimony tetroxide is an inorganic compound with the formula Sb2O4. This material, which exists as the mineral cervantite, is white but reversibly yellows upon heating. The material, with empirical formula SbO2, is called antimony tetroxide to signify the presence of two kinds of Sb centers.

Formation and structure

The material forms when Sb2O3 is heated in air:

Sb2O3 + 0.5 O2 → Sb2O4 ΔH = −187 kJ/mol

At 800 °C, antimony(V) oxide loses oxygen to give the same material:

Sb2O5 → Sb2O4 + 0.5 O2 ΔH = −64 kJ/mol

The material is mixed valence, containing both Sb(V) and Sb(III) centers. Two polymorphs are known, one orthorhombic (shown in the infobox) and one monoclinic. Both forms feature octahedral Sb(V) centers arranged in sheets with distorted Sb(III) centers bound to four oxides.

References

  1. ^ J. Amador, E. Gutierrez Puebla, M. A. Monge, I. Rasines, and C. Ruiz Valero "Diantimony Tetraoxides Revisited" Inorganic Chemistry 1988, Volume 27, pp. 1367–1370. doi:10.1021/ic00281a011
  2. "Cervantite". Webminerals. Retrieved 2009-06-06.
  3. Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
Antimony compounds
Antimonides
Sb(III)
Organoantimony(III) compounds
Sb(III,V)
Sb(V)
Organoantimony(V) compounds
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