Mercury(I) bromide
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| Names | |||
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| IUPAC name
Dimercury dibromide
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| Other names
Mercury(I) bromide
Mercurous bromide | |||
| Identifiers | |||
3D model (JSmol)
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| ChemSpider | |||
| ECHA InfoCard | 100.150.337 | ||
| EC Number |
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PubChemCID
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| UNII | |||
| UN number | 1634 | ||
CompTox Dashboard(EPA)
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| Properties | |||
| 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[1] | ||
| 3.9 x 10−5g/100 mL | |||
Solubility product(Ksp)
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6.4×10−23[2] | ||
| Solubility | insoluble inether,acetone,alcohol | ||
| −28.6·10−6cm3/mol | |||
| Structure | |||
| linear | |||
| Hazards[3] | |||
| GHSlabelling: | |||
  
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| Danger | |||
| H300,H310,H330,H373,H410 | |||
| 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 | |||
Otheranions
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Mercury(I) fluoride Mercury(I) chloride Mercury(I) iodide | ||
Othercations
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Zinc bromide Cadmium bromide | ||
Related compounds
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Mercury(II) bromide | ||
Except where otherwise noted, data are given for materials in theirstandard state(at 25 °C [77 °F], 100 kPa).
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Mercury(I) bromideormercurous bromideis thechemical compoundcomposed ofmercuryandbrominewith theformulaHg2Br2.It changes color from white to yellow when heated[1]andfluorescesa salmon color when exposed toultravioletlight. It has applications inacousto-optical devices.[4]
A very rare mineral form is called kuzminite and has the chemical formulaHg2(Br,Cl)2.
Reactions
[edit]Mercury(I) bromide is prepared by the oxidation of elemental mercury with elemental bromine or by addingsodium bromideto a solution ofmercury(I) nitrate.[1]It decomposes tomercury(II) bromideand elemental mercury[when?].[4]
Structure
[edit]In common with other Hg(I) (mercurous) compounds which contain linear X-Hg-Hg-X units, Hg2Br2contains 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
[edit]- ^abc Perry, Dale L.; Phillips, Sidney L. (1995),Handbook of Inorganic Compounds,CRC Press, p. 255,ISBN0-8493-8671-3,retrieved2008-05-30
- ^John Rumble (June 18, 2018).CRC Handbook of Chemistry and Physics(99 ed.). CRC Press. pp. 5–188.ISBN978-1138561632.
- ^ "483230 Mercury(I) bromide 99.9+ %".Sigma-Aldrich.Retrieved2008-05-30.
- ^ab Macintyre, Jane Elizabeth; Daniel, F. M.; Stirling, V. M. (1992),Dictionary of Inorganic Compounds,vol. 1, CRC Press, p. 314,ISBN0-412-30120-2,retrieved2008-05-30
- ^abWells A.F. (1984)Structural Inorganic Chemistry5th edition Oxford Science PublicationsISBN0-19-855370-6
- ^Cotton, F. Albert;Wilkinson, Geoffrey;Murillo, Carlos A.; Bochmann, Manfred (1999),Advanced Inorganic Chemistry(6th ed.), New York: Wiley-Interscience,ISBN0-471-19957-5