Mercury(I) bromide
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| UN number | 1634 |
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| Template:Longitem | Hg2Br2 |
| Molar mass | 560.99 g/mol |
| Appearance | white to yellow tetragonal crystals |
| Odor | odorless |
| Density | 7.307 g/cm3, solid |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Template:Longitem | 6.4Template:E[2] |
| Solubility | insoluble in ether, acetone, alcohol |
| Template:Longitem | −28.6·10−6 cm3/mol |
| Template:Longitem | linear |
| Template:Longitem | Mercury(I) fluoride Mercury(I) chloride Mercury(I) iodide |
| Template:Longitem | Zinc bromide Cadmium bromide |
| Template:Longitem | Mercury(II) bromide |
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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 and has the chemical formula Template:Chem2.
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 mercuryScript error: No such module "Unsubst"..[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
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- ↑ a b Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications Template:ISBN
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