Antimony tetroxide

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Antimony tetroxide
Sb2O4 structure.jpg
     An      O
Names
IUPAC name
antimony(III,V) oxide
Identifiers
1332-81-6 N
PubChem 74002
Properties
SbO2; Sb2O4
Molar mass 153.7588; 307.5176 g/mol
Appearance white solid
Density 6.64 g/cm3 (orthorhombic form) [1]
Melting point > 930 °C (decomposes)
Boiling point decomposes
insoluble
2.0
Structure
orthorhombic
Hazards
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Related compounds
Antimony trioxide
Antimony pentoxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Antimony tetroxide is an inorganic compound with the formula Sb2O4. This material, which exists as the mineral cervantite,[2] 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[edit]

The material forms when Sb2O3 is heated in air:[3]

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.[1] Both forms feature octahedral Sb(V) centers arranged in sheets with distorted Sb(III) centers bound to four oxides.

References[edit]

  1. ^ a b Amador, J.; Puebla, E. Gutierrez; Monge, M. A.; Rasines, I.; Valero, C. Ruiz (1988). "Diantimony Tetraoxides Revisited". Inorganic Chemistry 27: 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.