On tetrafluorobromates(III): Crystal structures of the dibromate CsBr 2F7 and the monobromate CsBrF4

Sergey Ivlev, Patrick Woidy, Vasily Igorevich Sobolev, Ivan Ignatievich Zherin, Roman Ostvald, Florian Kraus

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Alkali and alkaline earth metal tetrafluorobromates MIBrF 4, 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. CsBr2F 7 is, however, not isostructural to CsAu2F7.

Original languageEnglish
Pages (from-to)2846-2850
Number of pages5
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Issue number15
Publication statusPublished - Dec 2013


  • Cesium
  • Crystal structure
  • Rietveld refinement
  • Single crystal X-ray diffraction
  • Tetrafluorobromate

ASJC Scopus subject areas

  • Inorganic Chemistry

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