Chromium (II) fluoride

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Crystal structure
Crystal structure of chromium (II) fluoride
__ Cr 2+      __ F -
General
Surname Chromium (II) fluoride
other names

Chromium difluoride

Ratio formula CrF 2
Brief description

light green powder

External identifiers / databases
CAS number 10049-10-2
EC number 233-168-0
ECHA InfoCard 100.030.140
PubChem 66229
Wikidata Q423577
properties
Molar mass 89.99 g mol −1
Physical state

firmly

density

4.11 g cm −3

Melting point

894 ° C

boiling point

> 1300 ° C

solubility

slightly soluble in water

safety instructions
GHS labeling of hazardous substances
05 - Corrosive

danger

H and P phrases H: 314
P: 280-305 + 351 + 338-310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromium (II) fluoride is an inorganic chemical compound of chromium from the group of fluorides .

Extraction and presentation

Chromium (II) fluoride can be obtained by reacting chromium with fluorine salts of more noble metals (e.g. cadmium (II) fluoride , tin (II) fluoride or bismuth (III) fluoride ), the reaction being above the Melting temperature of the salts is carried out.

It is also possible to produce it by reacting chromium with hydrogen fluoride at around 200 ° C. or by reacting chromium (III) fluoride with hydrogen .

properties

Chromium (II) fluoride is a light green powder. It has a monoclinic crystal structure of the distorted rutile type with the space group P 2 1 / c (space group no. 14) . When heated in air, it decomposes to form chromium (III) oxide . Template: room group / 14

Individual evidence

  1. ↑ a b c d e data sheet Chromium (II) fluoride, 97% from Sigma-Aldrich , accessed on November 16, 2012 ( PDF ).
  2. ↑ a b c d Jean Ans, Ellen Lax: Paperback for chemists and physicists . tape 3 : Elements, inorganic compounds and materials, minerals . Springer DE, 1998, ISBN 3-540-60035-3 , pp. 396 ( limited preview in Google Book search).
  3. ^ A b Dale L. Perry: Handbook of Inorganic Compounds . 2nd Edition. Taylor & Francis US, 2011, ISBN 978-1-4398-1461-1 , pp. 516 ( limited preview in Google Book search).
  4. ↑ a b J. J. Zuckerman: Inorganic Reactions and Methods, The Formation of Bonds to Halogens . John Wiley & Sons, 2009, ISBN 978-0-470-14539-5 , pp. 178, 182 ( limited preview in Google Book search).
  5. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1616.
  6. ^ Ralf Alsfasser, HJ Meyer: Modern inorganic chemistry: with CD-Rom . Walter de Gruyter, 2007, ISBN 978-3-11-019060-1 , p. 196 ( limited preview in Google Book search).