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]
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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 | ||
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PubChem CID
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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 10−5 g/100 mL | |||
Solubility product (Ksp)
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6.4×10−23[2] | ||
| Solubility | insoluble in ether, acetone, alcohol | ||
| −28.6·10−6 cm3/mol | |||
| Structure | |||
| linear | |||
| Hazards[3] | |||
| GHS labelling: | |||
  
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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 | |||
Other anions
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Mercury(I) fluoride Mercury(I) chloride Mercury(I) iodide | ||
Other cations
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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 their standard state (at 25 °C [77 °F], 100 kPa).
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A very rare mineral form is called kuzminite and has the chemical formula Hg2(Br,Cl)2.
Reactions
editMercury(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
editIn 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
edit- ^ 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