Einsteinium(III) oxide

__Es3+     __O2−
Names
IUPAC names Einsteinium sesquioxide Dieinsteinium trioxide Einsteinium(III) oxide
Identifiers
CAS Number	37362-94-0
3D model (JSmol)	Interactive image
ChemSpider	154325 deprecated
PubChemCID	177221 charge imbalance
InChI InChI=1S/2Es.3O/q2*+3;3*-2 Key: DMBKIFBGDPVPRA-UHFFFAOYSA-N
SMILES [Es+3].[Es+3].[O-2].[O-2].[O-2]
Properties
Chemical formula	Es2O3
Molar mass	554 g/mol (253Es)
Appearance	colourless solid[1]
Structure
Crystal structure	Hexagonal
Space group	Ia3
Lattice constant	a = 370 pm,c = 600 pm[2]
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). Infobox references

Einsteinium(III) oxide is anoxide of thesyntheticactinideeinsteinium which has themolecular formula Es₂O₃. It is a colourless solid.^[1]

Three modifications are known. Thebody-centered cubic form haslattice parametera = 1076.6 ± 0.6 pm; this allows theionic radius of the Es³⁺ion to be calculated as 92.8 pm.^[3] The other two forms aremonoclinic andhexagonal: the hexagonal form has thelanthanum(III) oxide structure.^[4]

Einsteinium(III) oxide can be obtained byannealingeinsteinium(III) nitrate in sub-microgram quantities.^[3]

• Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.).The Chemistry of the Actinide and Transactinide Elements(PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620.doi:10.1007/1-4020-3598-5_12.ISBN 978-1-4020-3555-5. Archived fromthe original(PDF) on 2010-07-17.

• Einsteinium compounds
• Sesquioxides

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