Mercury selenide

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Mercury(II) selenide
Mercury(II) selenide unit cell
Identifiers
CAS number 20601-83-6 YesY
PubChem 88609
Properties
Molecular formula 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
Solubility in water insoluble
Structure
Crystal structure sphalerite
Thermochemistry
Specific
heat capacity
C
178 J kg−1 K−1
Std enthalpy of
formation
ΔfHo298
247 kJ/mol
Hazards
EU Index 080-002-00-6
EU classification Very toxic (T+)
Dangerous for the environment (N)
R-phrases R26/27/28, R33, R50/53
S-phrases (S1/2), S13, S28, S45, S60, S61
Flash point Non-flammable
Related compounds
Other anions Mercury oxide
Mercury sulfide
Mercury telluride
Other cations Zinc selenide
Cadmium selenide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
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.

Applications[edit]

  • Selenium is used in filters in some steel plants to remove mercury from exhaust gases. The solid product formed is HgSe.
  • HgSe can be used as an ohmic contact to wide-gap II-VI semiconductors such as zinc selenide or zinc oxide.

Toxicity[edit]

HgSe is non-toxic so 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.[1]

See also[edit]

References[edit]

  1. ^ Watanabe, C. (2002). "Modification of Mercury Toxicity by Selenium: Practical Importanc?". The Tohoku Journal of Experimental Medicine 196 (2): 71–77. doi:10.1620/tjem.196.71. PMID 12498318.  edit

External links[edit]