On Tetrafluorobromates(III): Crystal Structures of the Dibromate CsBr2F7 and the Monobromate CsBrF41. Issue 15 (6th August 2013)

• Record Type: Journal Article
• Authors: Ivlev, Sergey; Woidy, Patrick; Sobolev, Vasily; Gerin, Ivan; Ostvald, Roman; Kraus, Florian
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 639:Issue 15(2013)
• Page Start: 2846
• Page End: 2850
• Publication Date: 2013-08-06
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201300290
• Languages: English
• ISSNs: 0044-2313

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Alkali and alkaline earth metal tetrafluorobromates <italic>M</italic>^IBrF₄, <italic>M</italic>^II(BrF₄)₂ (<italic>M</italic>^I = Na–Cs, <italic>M</italic>^II = 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 (<bold>1</bold>), 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 (<bold>2</bold>), was obtained as a colorless powder. Compound <bold>2</bold> can also be obtained from compound <bold>1</bold> by evacuation. The crystal structure of CsBrF₄ (<bold>2</bold>) was elucidated by Rietveld refinement on its X‐ray powder pattern. Its structure is not isotypic to <italic>M</italic>BrF₄ (<italic>M</italic> = Na, K, Rb, NO) but isotypic to CsAuF₄. CsBr₂F₇ is, however, not isostructural to CsAu₂F₇.</p> </abstract>