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Silver(I) undecafluorodiantimonate(V).

Zoran Mazej¹, Primoz Benkic

¹Department of Inorganic Chemistry and Technology, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. zoran.mazej@ijs.si

Inorganic Chemistry

|December 9, 2003

Summary

The reaction of silver tetrafluoroborate and antimony pentafluoride in anhydrous hydrogen fluoride produces AgSb2F11. This compound, previously misidentified as beta-Ag(SbF6)2, is confirmed to be a silver(I) compound.

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Area of Science:

Inorganic Chemistry
Solid-State Chemistry
Fluorine Chemistry

Background:

The synthesis and characterization of novel antimony-silver fluoride compounds are of interest.
Previous literature suggested the existence of a mixed-valence Ag(I)/Ag(III) compound, beta-Ag(SbF6)2.

Purpose of the Study:

To synthesize and characterize the compound formed from AgBF4 and SbF5 in anhydrous hydrogen fluoride.
To clarify the identity and structure of the previously reported beta-Ag(SbF6)2.

Main Methods:

Chemical synthesis in anhydrous hydrogen fluoride.
Recrystallization and solvent removal.
Single-crystal X-ray diffraction.
Vibrational spectroscopy (IR/Raman).
Oxidation studies with elemental fluorine.

Main Results:

The reaction yields a white solid, AgSb2F11.
Single-crystal X-ray diffraction reveals AgSb2F11 is orthorhombic (Pbca) with specific lattice parameters.
Vibrational spectra of AgSb2F11 match literature data for beta-Ag(SbF6)2.
Oxidation studies indicate the presence of Ag(II) species, consistent with a Ag(I) precursor.

Conclusions:

The compound previously identified as beta-Ag(SbF6)2 is actually AgSb2F11.
AgSb2F11 is a silver(I) compound, not a mixed-valence Ag(I)/Ag(III) species.
The crystal structure of AgSb2F11 is related to H3OSb2F11.

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