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- W2068621208 abstract "Abstract The reactions between Ln(AsF 6 ) 3 (Ln: lanthanide) and excess of XeF 2 in anhydrous HF (aHF) as a solvent yield coordination compounds [Ln(XeF 2 ) 3 ](AsF 6 ) 3 or LnF 3 together with Xe 2 F 3 AsF 6 or mixtures of all mentioned products depending on the fluorobasicity of XeF 2 and LnF 3 along the series. XeF 2 in a basic aHF is able to oxidize Pr 3+ to Pr 4+ besides Ce 3+ to Ce 4+ and Tb 3+ to Tb 4+ . The tetrafluorides obtained are weaker fluorobases as XeF 2 and are immediately exchanged with XeF 2 yielding Xe 2 F 3 AsF 6 and LnF 4 . The analogous reaction between Ln(BiF 6 ) 3 and XeF 2 in aHF yields [Ln(XeF 2 ) 3 ](BiF 6 ) 3 , Ln: La, Nd. Raman spectra of the compounds [Ln(XeF 2 ) n ](AF 6 ) 3 (A: As, Bi) show that no XeF + salts are formed. The interaction of XeF 2 with metal ion is covalent over the fluorine bridge. Analogous reactions of Ln(AsF 6 ) 3 with AsF 3 in aHF yield [Ln(AsF 3 ) 3 ](AsF 6 ) 3 which are stable in a dynamic vacuum at temperatures lower than 233 K. In reactions between M(AF 6 ) 2 (M: alkaline earth metal and Pb, A: As, Sb) and XeF 2 in aHF as a solvent, compounds of the type [M(XeF 2 ) n ](AF 6 ) 2 were synthesized. Analogous reactions with AsF 3 yield coordination compounds of the type [M(AsF 3 ) n ](AsF 6 ) 2 . During the preparation of M x (AsF 6 ) x (M: metal in oxidation state x +) by the reaction between metal fluoride and excess of AsF 5 in aHF it was found that HF could also act as a ligand to the metal ions (e.g. Ca(HF)(AsF 6 ) 2 )." @default.
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- W2068621208 date "2002-04-01" @default.
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- W2068621208 title "Coordination compounds with XeF2, AsF3 and HF as ligands to metal ions: a review of reaction systematics, Raman spectra and metal, fluoro-ligand polyhedra" @default.
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- W2068621208 doi "https://doi.org/10.1016/s0022-1139(02)00020-9" @default.
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