Mercury(I) bromide
| Mercury(I) bromide | ||
|---|---|---|
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| IUPAC name Mercury(I) bromide | ||
| Other names Mercurous bromide | ||
| Identifiers | ||
| CAS number | 15385-58-7  | |
| PubChem | 24829 | |
| Properties | ||
| Molecular 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 | |
| Boiling point | sublimes at ~390°C | |
| Solubility in water | 3.9 x 10-5 g/100 mL | |
| Solubility | insoluble in ether, acetone, alcohol | |
| Structure | ||
| Molecular shape | linear | |
| Hazards | ||
| EU classification | Very toxic (T+) Dangerous for the environment (N) | |
| R-phrases | R26/27/28, R33, R50/53 | |
| S-phrases | S13, S28, S45, S60, S61[2] | |
| Flash point | non-flammable | |
| Related compounds | ||
| Other anions | Mercury(I) fluoride Mercury(I) chloride Mercury(I) iodide | |
| Other cations | Zinc bromide Cadmium bromide Mercury(II) bromide | |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| 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 orange 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.[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
- ↑ 1.0 1.1 1.2 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.
- ↑ 3.0 3.1 Macintyre, Jane Elizabeth; Daniel, F. M.; Stirling, V. M. (1992), Dictionary of Inorganic Compounds 1, CRC Press, p. 314, ISBN 0-412-30120-2, retrieved 2008-05-30
- ↑ 4.0 4.1 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
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