Mercury(I) bromide

Mercury(I) bromide
Names
	IUPAC name Dimercury dibromide
	Other names Mercury(I) bromide; Mercurous bromide
Identifiers
CAS Number	10031-18-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	23214;
ECHA InfoCard	100.150.337
EC Number	621-489-2;
PubChem CID	24829;
UNII	JSJ4936A2S ;
UN number	1634
CompTox Dashboard (EPA)	DTXSID3065879 ;
	InChI InChI=1S/2BrH.2Hg/h21H;;/q;;2+1/p-2 Key: RVARJMCTILSHND-UHFFFAOYSA-L;
	SMILES Br[Hg][Hg]Br;
Properties
Chemical formula	Hg2Br2
Molar mass	560.99 g/mol
Appearance	white to yellow tetragonal crystals
Odor	odorless
Density	7.307 g/cm3, solid
Melting point	405 °C (761 °F; 678 K)
Boiling point	~ 390 °C (734 °F; 663 K) sublimes
Solubility in water	3.9 x 10−5 g/100 mL
Solubility product (Ksp)	6.4×10−23
Solubility	insoluble in ether, acetone, alcohol
Magnetic susceptibility (χ)	−28.6·10−6 cm3/mol
Structure
Molecular shape	linear
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H310, H330, H373, H410
Precautionary statements	P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P304+P340, P310, P314, P320, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501
Flash point	non-flammable
Related compounds
Other anions	Mercury(I) fluoride; Mercury(I) chloride; Mercury(I) iodide
Other cations	Zinc bromide; Cadmium bromide
Related compounds	Mercury(II) bromide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Mercury(I) bromide or mercurous bromide is the chemical compound composed of mercury and bromine with the formula Hg₂Br₂. It changes color from white to yellow when heated^[1] and fluoresces a salmon color when exposed to ultraviolet light. It has applications in acousto-optical devices.^[4]

A very rare mineral form is called kuzminite and has the chemical formula Hg₂(Br,Cl)₂.

Reactions

Mercury(I) bromide is prepared by the oxidation of elemental mercury with elemental bromine or by adding sodium bromide to a solution of mercury(I) nitrate.^[1] It decomposes to mercury(II) bromide and elemental mercury^[when?].^[4]

Structure

In common with other Hg(I) (mercurous) compounds which contain linear X-Hg-Hg-X units, Hg₂Br₂ contains linear BrHg₂Br units with an Hg-Hg bond length of 249 pm (Hg-Hg in the metal is 300 pm) and an Hg-Br bond length of 271 pm.^[5] The overall coordination of each Hg atom is octahedral as, in addition to the two nearest neighbours, there are four other Br atoms at 332 pm.^[5] The compound is often formulated as Hg₂²⁺ 2Br⁻,^[6] although it is actually a molecular compound.

References

^ ^a ^b ^c Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, p. 255, ISBN 0-8493-8671-3, retrieved 2008-05-30
^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
^ "483230 Mercury(I) bromide 99.9+ %". Sigma-Aldrich. Retrieved 2008-05-30.
^ ^a ^b Macintyre, Jane Elizabeth; Daniel, F. M.; Stirling, V. M. (1992), Dictionary of Inorganic Compounds, vol. 1, CRC Press, p. 314, ISBN 0-412-30120-2, retrieved 2008-05-30
^ ^a ^b Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
^ Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5

[hand-1] Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, p. 255, ISBN 0-8493-8671-3, retrieved 2008-05-30

[crc-2] John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.

[sa-3] "483230 Mercury(I) bromide 99.9+ %". Sigma-Aldrich. Retrieved 2008-05-30.

[dict-4] Macintyre, Jane Elizabeth; Daniel, F. M.; Stirling, V. M. (1992), Dictionary of Inorganic Compounds, vol. 1, CRC Press, p. 314, ISBN 0-412-30120-2, retrieved 2008-05-30

[Wells-5] Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6

[Cotton-6] Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5

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Mercury(I) bromide

Reactions

Structure

References

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