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On Tetrafluorobromates(III): Crystal Structures of the Dibromate CsBr2F7 and the Monobromate CsBrF4

Authors

  • Sergey Ivlev,

    1. Tomsk Polytechnic University, Institute of Physics and Technology, Applied Chemistry of Rare Elements Department, 30 Lenina avenue, Tomsk, 634050, Russia
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  • Patrick Woidy,

    1. AG Fluorchemie, Department Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany
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  • Vasily Sobolev,

    1. Tomsk Polytechnic University, Institute of Physics and Technology, Applied Chemistry of Rare Elements Department, 30 Lenina avenue, Tomsk, 634050, Russia
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  • Ivan Gerin,

    1. Tomsk Polytechnic University, Institute of Physics and Technology, Applied Chemistry of Rare Elements Department, 30 Lenina avenue, Tomsk, 634050, Russia
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  • Roman Ostvald,

    Corresponding author
    1. Tomsk Polytechnic University, Institute of Physics and Technology, Applied Chemistry of Rare Elements Department, 30 Lenina avenue, Tomsk, 634050, Russia
    • Roman Ostvald, Tomsk Polytechnic University, Institute of Physics and Technology, Applied Chemistry of Rare Elements Department, 30 Lenina avenue, Tomsk, 634050, Russia, Fax: +7-3822-419-801

      Florian Kraus, AG Fluorchemie, Department Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany, Fax: +49-89-289-13762

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  • Florian Kraus

    Corresponding author
    1. AG Fluorchemie, Department Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany
    • Roman Ostvald, Tomsk Polytechnic University, Institute of Physics and Technology, Applied Chemistry of Rare Elements Department, 30 Lenina avenue, Tomsk, 634050, Russia, Fax: +7-3822-419-801

      Florian Kraus, AG Fluorchemie, Department Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany, Fax: +49-89-289-13762

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  • Dedicated to Professor Wolfgang Bensch on the Occasion of His 60th Birthday

Abstract

Alkali and alkaline earth metal tetrafluorobromates MIBrF4, MII(BrF4)2 (MI = Na–Cs, MII = Sr, Ba) can be synthesized from the respective fluorides and BrF3. By the reaction of CsF with an excess of BrF3, the compound cesium tetrafluoridobromate(III) bromine trifluoride (1/1), CsBr2F7 (1), was obtained in the form of a colorless powder and as single crystals. Shown by X-ray diffraction on single crystals, its Br2F7 anion is neither planar, nor is its Br–μ-F–Br unit linear, as previously deduced by Raman spectroscopy. In stoichiometric reactions of CsF with BrF3, the compound cesium tetrafluoridobromate(III), CsBrF4 (2), was obtained as a colorless powder. Compound 2 can also be obtained from compound 1 by evacuation. The crystal structure of CsBrF4 (2) was elucidated by Rietveld refinement on its X-ray powder pattern. Its structure is not isotypic to MBrF4 (M = Na, K, Rb, NO) but isotypic to CsAuF4. CsBr2F7 is, however, not isostructural to CsAu2F7.

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