Chromium (VI) fluoride

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General
Surname Chromium (VI) fluoride
other names

Chromium hexafluoride

Molecular formula CrF 6
Brief description

yellow solid

External identifiers / databases
CAS number 13843-28-2
PubChem 5460740
Wikidata Q5113834
properties
Molar mass 165.99 g mol −1
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary
08 - Dangerous to health 07 - Warning 09 - Dangerous for the environment

danger

H and P phrases H: 350i-317-410
P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromium (VI) fluoride is a hypothetical inorganic chemical compound from the group of fluorides . Since it has been shown that the IR spectrum of matrix-isolated chromium (V) fluoride is identical to the IR spectrum of chromium (VI) fluoride known from the literature, its existence as an independent compound is doubted.

Extraction and presentation

The first synthesis of the compound was reported in 1963 by Oskar Glemser by synthesis from the elements at 400 ° C and 350 atm, which also produced a lot of chromium (V) fluoride .

After several unsuccessful attempts at reproduction, Eric G. Hope reported the synthesis by fluorination of chromium (VI) oxide , the product showing a ratio of chromium to fluorine of 1 to 5.7.

properties

Chromium (VI) fluoride is a lemon-yellow, decomposable product that quickly breaks down into chromium (V) fluoride and fluorine at temperatures above −100 ° C.

Individual evidence

  1. ↑ a b Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 265.
  2. ↑ Entry on chromium (VI) compounds in the GESTIS substance database of the IFA , accessed on January 10, 2017(JavaScript required) .
  3. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling it falls under the group entry Chromium (VI) compounds, with the exception of barium chromate and of compounds specified elsewhere in this Annex in the Classification and Labeling inventory of the European Chemicals Agency (ECHA), accessed on August 14, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
  4. ↑ Eberhard Jacob, Helge Willner: Spectroscopic studies of higher chromium fluorides. On the question of the existence of chromium hexafluoride, CrF 6 . In: Chemical Reports . 123, 1990, pp. 1319-1321, doi : 10.1002 / cber.19901230616 .
  5. ↑ a b Eric G. Hope, William Levason, J. Steven Ogden: Is chromium hexafluoride octahedral? Experiment still suggests "yes!". In: Inorganic Chemistry . 30, 1991, pp. 4873-4874, doi : 10.1021 / ic00026a002 .