Chromium (III) bromide

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Crystal structure
Crystal structure of chromium (III) bromide
__ Cr 3+      __ Br -
Crystal system

rhombohedral

Space group

R 3 (No. 148)Template: room group / 148

Lattice parameters

a = 626 pm, c = 1820 pm

General
Surname Chromium (III) bromide
other names

Chromium tribromide

Ratio formula CrBr 3
Brief description

black solid

External identifiers / databases
CAS number
  • 10031-25-1
  • 13478-06-3 (hexahydrate)
EC number 233-088-6
ECHA InfoCard 100.030.068
PubChem 5155129
Wikidata Q423619
properties
Molar mass 291.76 g mol −1
Physical state

firmly

density
  • 4.68 g cm −3
  • 5.4 g cm −3 (hexahydrate)
Melting point

79 ° C (hexahydrate)

solubility

almost insoluble in water

safety instructions
GHS labeling of hazardous substances

Hexahydrate

05 - Corrosive 06 - Toxic or very toxic 08 - Dangerous to health

danger

H and P phrases H: 302-312-314-317-330-361
P: 260-280-284-305 + 351 + 338-310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromium (III) bromide is a chemical compound from the group of bromides .

Extraction and presentation

Chromium (III) bromide can be obtained by reacting chromium with bromine .

Alternatively, it can also be obtained from chromium (III) acetate and acetyl bromide .

properties

Chromium (III) bromide forms shiny black crystals, which appear green in transmitted light and red in reflected light. It is only soluble in water when Cr (II) salts are added. It has a crystal structure of the iron (III) chloride type with the space group R 3 (space group no. 148) and a = 626 pm, c = 1820 pm). The hexahydrate is readily soluble in water and has a purple color. Template: room group / 148

Individual evidence

  1. ↑ a b c d e Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1487.
  2. ↑ External identifiers of or database links to chromium (III) bromide hexahydrate : CAS number: 13478-06-3, EC number: 626-630-1, ECHA InfoCard: 100.155.013 , PubChem : 11955373 , ChemSpider : 10129649 , Wikidata : Q54095141 .
  3. ↑ WebElements: Chromium tribromide
  4. ↑ a b c d Datasheet Chromium (III) bromide hexahydrate, 99% from Sigma-Aldrich , accessed on October 30, 2011 ( PDF ).
  5. ↑ American elements : Chromium (III) Bromide Hexahydrate