Chromyl fluoride

Structural formula
General
Surname	Chromyl fluoride
other names	Chromium difluorine dioxide
Molecular formula	CrF 2 O 2
Brief description	red-brown solid
External identifiers / databases
CAS number 7788-96-7 PubChem 71679209 ChemSpider 32701194 Wikidata Q4493255
properties
Molar mass	112.0 g mol −1
Physical state	firmly
Melting point	31.6 ° C
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromyl fluoride is an inorganic chemical compound of chromium from the group of fluorides .

Extraction and presentation

Chromyl fluoride can be obtained by reacting chromyl chloride with fluorine at 200 ° C or by reacting chromium (VI) oxide with sulfur tetrafluoride or hydrogen fluoride .

${\displaystyle \mathrm {CrO_{2}Cl_{2}+F_{2}\longrightarrow CrO_{2}F_{2}+Cl_{2}} }$

${\displaystyle \mathrm {CrO_{3}+SF_{4}\longrightarrow CrO_{2}F_{2}+SOF_{2}} }$

The compound was first synthesized in pure form in 1952 by Engelbrecht and Grosse.

properties

Chromyl fluoride is a solid of which two modifications exist. The red-brown to black-red form is unstable (especially when exposed to light, UV radiation and heat) and can only be stored by keeping the freshly condensed product at around −190 ° C with the exclusion of light using liquid air. The second polymeric modification is off-white, resistant and only evaporates after 200 ° C, with red-brown vapors forming. The compound attacks glass when it is wet. Gaseous chromyl fluoride is red-brown.

Individual evidence

1. ↑ ^{a b c d e f} 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. 266.
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ Alfred Engelbrecht, Aristid V. Height: . In: Journal of the American Chemical Society. 74, 1952, pp. 5262-5264, doi : 10.1021 / ja01141a007 .
4. ^ Viktor Gutmann: Halogen Chemistry . Elsevier, 2012, ISBN 0-323-14847-6 , pp. 246 ( limited preview in Google Book search).