Mercury (I) bromide

Structural formula
General
Surname	Mercury (I) bromide
other names	Mercury dibromide
Molecular formula	Hg 2 Br 2
Brief description	colorless, odorless, light-sensitive powder
External identifiers / databases
EC number	621-489-2
ECHA InfoCard	100.150.337
PubChem	24829
Wikidata	Q172498
properties
Molar mass	560.99 g mol −1
Physical state	firmly
density	7.3 g cm −3
Melting point	390 ° C (decomposition)
solubility	almost insoluble in water (0.4 mg l −1 at 25 ° C) ° C
safety instructions
H and P phrases	H: 330-310-300-373-410
	P: 260-264-273-280-284-301 + 310
MAK	0.1 mg m −3
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Mercury (I) bromide is a chemical compound from the group of bromides . It is in the form of a white, odorless powder. When exposed to light, it turns dark over time and yellow when heated. It fluoresces orange under UV light .

Occurrence

Mercury (I) bromide occurs as a component of the very rare mineral kuzminit Hg ₂ (Br, Cl) ₂ .

Extraction and presentation

Mercury (I) bromide can be obtained by reacting elemental mercury with bromine or by adding sodium bromide or potassium bromide to a solution of mercury (I) nitrate .

{\ displaystyle \ mathrm {Hg_ {2} (NO_ {3}) _ {2} +2 \ KBr \ longrightarrow Hg_ {2} Br_ {2} +2 \ KNO_ {3}}}

properties

Mercury (I) bromide has a linear Br-Hg-Hg-Br structure with a distance of 249 pm between the two mercury atoms and 271 pm between mercury and bromine.

safety instructions

With mercury (I) bromide there is a risk of skin sensitization. It is also classified as a carcinogen in category 3B.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Entry on mercury (I) bromide in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling falls under the group entry inorganic compounds of mercury with the exception of mercuric sulphide and those specified elsewhere in this Annex in the Classification and Labeling Inventory of European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
↑ Mercury (I) bromide data sheet from Sigma-Aldrich , accessed on April 22, 2011 ( PDF ).

↑ Mineral Atlas: Kuzminit

↑ Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1052.

^ AF Wells: Structural Inorganic Chemistry. 5th edition, Oxford Science Publications, 1984, ISBN 0-19-855370-6 .

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f Entry on mercury (I) bromide in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .

[CLP_100.240.785-2] Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling falls under the group entry inorganic compounds of mercury with the exception of mercuric sulphide and those specified elsewhere in this Annex in the Classification and Labeling Inventory of European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[Sigma-3] Mercury (I) bromide data sheet from Sigma-Aldrich , accessed on April 22, 2011 ( PDF ).

[4] Mineral Atlas: Kuzminit

[brauer-5] Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1052.

[wells-6] AF Wells: Structural Inorganic Chemistry. 5th edition, Oxford Science Publications, 1984, ISBN 0-19-855370-6 .