Novel lanthanoid fluoroarsenates

A family of lanthanoid(III) hexafluoroarsenates(V), La (AsF6)3, LnF(AsF6)2, Ln=Ce–Er, and Ln2F3(AsF6)3, Ln=Tm, Yb, Lu, has been stabilized with some fluoro bases as additional ligands forming new compounds: La(HF)2(AsF6)3, La(XeF2)2.5(AsF6)3 and Ln(AsF3)3(AsF6)3, Ln=Ce, Pr. La(HF)2 (AsF6)3 was prepa...

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Bibliographic Details
Published in:Journal of fluorine chemistry 2000-02, Vol.101 (2), p.155-160
Main Authors: Lutar, Karel, Borrmann, Horst, Mazej, Zoran, Tramšek, Melita, Benkič, Primož, Žemva, Boris
Format: Article
Language:English
Subjects:
Lanthanoid(III) hexafluoroarsenates(V)
Structures
Syntheses
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Summary:A family of lanthanoid(III) hexafluoroarsenates(V), La (AsF6)3, LnF(AsF6)2, Ln=Ce–Er, and Ln2F3(AsF6)3, Ln=Tm, Yb, Lu, has been stabilized with some fluoro bases as additional ligands forming new compounds: La(HF)2(AsF6)3, La(XeF2)2.5(AsF6)3 and Ln(AsF3)3(AsF6)3, Ln=Ce, Pr. La(HF)2 (AsF6)3 was prepared by solvothermal reaction in AsF5 above its critical temperature, while syntheses of other compounds were carried out in anhydrous hydrogen fluoride (aHF) as a solvent at ambient temperature. When Ln2O3 were used as starting compounds in the AsF5/aHF superacid medium the oxonium compounds of the type (H3O)xLnyFz(AsF6)x+3y−z were synthesized. The crystal structures of (H3O)8La2F(AsF6)13, (H3O)4La2F(AsF3)2(AsF6)9, La(HF)2(AsF6)3 and La(XeF2)2.5(AsF6)3 exhibit low-dimensional structural features, while the structure of Ln(AsF3)3(AsF6)3 (Ln=Ce, Pr) shows a three-dimensional network. In the structure of La(HF)2(AsF6)3 bonding interaction between HF and a metal centre is described for the first time.
ISSN:0022-1139
1873-3328
DOI:10.1016/S0022-1139(99)00152-9