Chromium (II) bromide

Crystal structure
__ Cr 2+      __ Br -
General
Surname	Chromium (II) bromide
other names	Chromium dibromide
Ratio formula	CrBr 2
Brief description	white solid
External identifiers / databases
CAS number 10049-25-9 PubChem 11074693 ChemSpider 9249842 Wikidata Q4096900
properties
Molar mass	211.80 g mol −1
Physical state	firmly
density	4.356 g cm −3
Melting point	842 ° C
solubility	soluble in water
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 .

Chromium (II) bromide is an inorganic chemical compound of chromium from the group of bromides .

Extraction and presentation

Chromium (II) bromide can be obtained by reducing chromium (III) bromide with hydrogen .

${\displaystyle \mathrm {2\ CrBr_{3}+H_{2}\longrightarrow 2\ CrBr_{2}+2\ HBr} }$

It is also possible to produce it by reacting chromium (II) acetate with hydrogen bromide .

${\displaystyle \mathrm {Cr_{2}(CH_{3}CO_{2})_{4}+4\ HBr\longrightarrow 2\ CrBr_{2}+4\ CH_{3}CO_{2}H} }$

properties

Chromium (II) bromide is a white solid that is soluble in air-free water with a blue color. It oxidizes quickly in air. The melt turns yellow. The compound has a monoclinic crystal structure with the space group C 2 / m (space group no. 12) of the distorted cadmium (II) iodide type.

Individual evidence

1. ↑ ^{a b c d e f} Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1481.
2. ↑ ^{a b c} Roger Blachnik (Ed.): Pocket book for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. 4th, revised and revised edition. Springer, Berlin 1998, ISBN 3-540-60035-3 , pp. 392 .
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1453.