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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| ECHA InfoCard | 100.150.337 | ||
PubChem CID
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| UNII | |||
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 | insoluble in ether, acetone, alcohol | ||
| −28.6·10−6 cm3/mol | |||
| Structure | |||
| linear | |||
| Hazards | |||
| 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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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.[3]
A very rare mineral form is called kuzminite, 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?].[3]
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.[4] 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.[4] The compound is often formulated as Hg22+ 2Br−,[5] 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
- ^ "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