Actinium(III) oxide

Actinium(III) oxide
Names
	IUPAC name Actinium(III) oxide
	Systematic IUPAC name Actinium(3+) oxide
	Other names Actinium sesquioxide
Identifiers
CAS Number	12002-61-8 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.031.275
EC Number	234-417-6;
PubChem CID	21946271;
	InChI InChI=1S/2Ac.3O/q;;3*-2 [pubchem] Key: MAPOZTWVBAGEOP-UHFFFAOYSA-N [pubchem];
	SMILES [O--].[O--].[O--].[Ac+3].[Ac+3];
Properties
Chemical formula	Ac2O3
Molar mass	502.053 g/mol
Appearance	white
Structure
Crystal structure	Trigonal, hP5
Space group	P-3m1, No. 164
Related compounds
Other cations	Scandium(III) oxide; Yttrium(III) oxide; 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

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.[1][2] 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.

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

Actinium, Great Soviet Encyclopedia (in Russian)
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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[bse-1] Actinium, Great Soviet Encyclopedia (in Russian)

[2] 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.