Cadmium bromide

Crystal structure
__ Cd 2+      __ Br -
General
Surname	Cadmium bromide
other names	Cadmium (II) bromide Cadmium dibromide
Ratio formula	CdBr 2
Brief description	Colorless, hexagonal, pearly shiny scales
External identifiers / databases
CAS number 7789-42-6 13464-92-1 (tetrahydrate) PubChem 24609 Wikidata Q417129
properties
Molar mass	272.22 g mol −1
Physical state	firmly
density	5.196 g cm -3
Melting point	569 ° C
boiling point	863 ° C
solubility	950 g l −1 in water (18 ° C) 264 g l −1 in ethanol (15 ° C)
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary Caution H and P phrases H: 302-312-332-410 P: 220-273-280-501
Toxicological data	322 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Cadmium bromide , CdBr ₂ , is a chemical compound of cadmium and bromine .

Extraction and presentation

Cadmium bromide can be prepared from the elements at elevated temperatures.

${\displaystyle \mathrm {Cd+Br_{2}\longrightarrow CdBr_{2}} }$

Furthermore, it can also be produced by dissolving cadmium in hydrobromic acid and then crystallizing it.

properties

Cadmium bromide is present as colorless, hexagonal, pearly shimmering flakes and is very hygroscopic. It has a crystal structure of the cadmium chloride type (a = 398.5, c = 1884 pm). From a solution of cadmium bromide in water, the monohydrate crystallizes above 36 ° C, and below this temperature the tetrahydrate crystallizes.

use

Cadmium bromide is used as a raw material for the production of cadmium - tungsten- bromide complex compounds . Earlier it was also used for making silver bromide - gelatin for photographic images used.

Individual evidence

1. ↑ ^{a b c d e f g} 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. 1041.
2. ↑ ^{a b c d} data sheet cadmium bromide tetrahydrate from Sigma-Aldrich , accessed on March 15, 2011 ( PDF ).
3. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry Cadmium compounds in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016 . marketer can use the harmonized classification and labeling expand .
4. ↑ The drying plate - the roll film  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. (PDF file; 58 kB)