Actinium(III) oxide

Actinium(III) oxide is a chemical compound containing the rare radioactive element actinium. It has the formula Ac2O3. It is similar to its corresponding lanthanum compound, lanthanum(III) oxide, and contains actinium in the oxidation state +3.[2][3] Actinium oxide is not to be confused with Ac2O (acetic anhydride), where Ac is an abbreviation for acetyl instead of the symbol of the element actinium.

Not to be confused with Acetic anhydride.
Actinium(III) oxide
Unit cell, ball and stick model of actinium(III) oxide
Names
IUPAC name
Actinium(III) oxide
Systematic IUPAC name
Actinium(3+) oxide
Other names
Actinium sesquioxide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.031.275
EC Number
  • 234-417-6
  • InChI=1S/2Ac.3O/q;;3*-2 checkY[pubchem]
    Key: MAPOZTWVBAGEOP-UHFFFAOYSA-N checkY[pubchem]
  • [O--].[O--].[O--].[Ac+3].[Ac+3]
Properties
Ac2O3
Molar mass 502.053 g/mol
Appearance white
Melting point 2,327 °C (4,221 °F; 2,600 K)[1]
Structure
Trigonal, hP5
P3m1, No. 164
a = 408 pm, c = 630 pm[1]
Related compounds
Other cations
 Lanthanum(III) oxide
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

Reactions
  • Ac2O3 + 6HF → 2AcF3 + 3H2O
  • Ac2O3 + 6HCl → 2AcCl3 + 3H2O
  • 4Ac(NO3)3 → 2Ac2O3 + 12NO2 + 3O2
  • 4Ac + 3O2 → 2Ac2O3
  • Ac2O3 + 2AlBr3 → 2AcBr3 + Al2O3
  • 2Ac(OH)3 → Ac2O3 + 3H2O
  • Ac2(C2O4)3 → Ac2O3 + 3CO2 + 3CO
  • Ac2O3 + 3H2S → Ac2S3 + 3H2O

References
  1. Christine Guéneau; Alain Chartier; Paul Fossati; Laurent Van Brutzel; Philippe Martin (2020). "Thermodynamic and Thermophysical Properties of the Actinide Oxides". Comprehensive Nuclear Materials 2nd Ed. 7: 111–154. doi:10.1016/B978-0-12-803581-8.11786-2. ISBN 9780081028667. S2CID 261051636.
  2. Actinium, Great Soviet Encyclopedia (in Russian)
  3. Sherman, Fried; Hagemann, French; Zachariasen, W. H. (1950). "The Preparation and Identification of Some Pure Actinium Compounds". Journal of the American Chemical Society. 72 (2): 771–775. doi:10.1021/ja01158a034.


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