Mercury selenide
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| Names | |
|---|---|
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IUPAC name
Mercury selenide
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| Identifiers | |
| ECHA InfoCard | 100.039.903 |
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PubChem CID
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| Properties | |
| HgSe | |
| Molar mass | 279.55 g/mol |
| Appearance | grey-black solid |
| Density | 8.3 g/cm3 |
| Melting point | 1,000 °C; 1,830 °F; 1,270 K |
| insoluble | |
| Structure | |
| sphalerite | |
| Thermochemistry | |
| 178 J kg−1 K−1 | |
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Std enthalpy of
formation (ΔfH |
247 kJ/mol |
| Hazards | |
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EU classification (DSD) (outdated)
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Very toxic (T+) Dangerous for the environment (N) |
| R-phrases (outdated) | R26/27/28, R33, R50/53 |
| S-phrases (outdated) | (S1/2), S13, S28, S45, S60, S61 |
| Flash point | Non-flammable |
| Related compounds | |
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Other anions
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Mercury oxide Mercury sulfide Mercury telluride |
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Other cations
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Zinc selenide Cadmium selenide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
Mercury selenide (HgSe) is a chemical compound of mercury and selenium. It is a grey-black crystalline solid semi-metal with a sphalerite structure. The lattice constant is 0.608 nm.
Mercury selenide can also refer to the following chemical compounds: HgSe2 and HgSe8. HgSe is strictly mercury(II) selenide.
HgSe occurs naturally as the mineral Tiemannite.
Along with other II-VI compounds, colloidal nanocrystals of HgSe can be formed.
HgSe is non-toxic as long as it is not ingested due to its insolubility. Toxic hydrogen selenide fumes can be evolved on exposure to acids. HgSe is a relatively stable compound which might mean that it is less toxic than elemental mercury or many organometallic mercury compounds. Selenium's ability to complex with mercury has been proposed as a reason for the lack of mercury toxicity in deep sea fish despite high mercury levels.
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