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Tellurium trioxide

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Tellurium trioxide
Names
Other names tellurium(VI) oxide
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.277 Edit this at Wikidata
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/O3Te/c1-4(2)3Key: IIXQANVWKBCLEB-UHFFFAOYSA-N
  • InChI=1/O3Te/c1-4(2)3Key: IIXQANVWKBCLEB-UHFFFAOYAH
SMILES
  • O=(=O)=O
Properties
Chemical formula TeO3
Molar mass 175.6 g/mol
Appearance yellow-orange crystals (α-TeO3)
Density 5.07 g/cm³, solid
Melting point 430°C
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

Tellurium trioxide (TeO3) is an inorganic chemical compound of tellurium and oxygen. In this compound, tellurium is in the +6 oxidation state.

Polymorphs

There are two forms, yellow-red α-TeO3 and grey, rhombohedral, β-TeO3 which is less reactive.
α-TeO3 has a structure similar to FeF3 with octahedral TeO6 units that share all vertices.

Preparation

α-TeO3 can be prepared by heating orthotelluric acid, Te(OH)6 at over 300°C . The β-TeO3 form can be prepared by heating α-TeO3 in a sealed tube with O2 and H2SO4.
α-TeO3 is unreactive to water but is a powerful oxidising agent when heated. With alkalis it forms tellurates.
α-TeO3 when heated loses oxygen to form firstly Te2O5 and then TeO2.

References

  1. ^ Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
Tellurium compounds
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