Mercury selenide
Names | |
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IUPAC name Mercury selenide | |
Identifiers | |
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3D model (JSmol) |
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ECHA InfoCard | 100.039.903 |
EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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InChI
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Properties | |
Chemical formula | HgSe |
Molar mass | 279.55 g/mol |
Appearance | grey-black solid |
Odor | odorless |
Density | 8.266 g/cm3 |
Melting point | 1,000 °C; 1,830 °F; 1,270 K |
Solubility in water | insoluble |
Structure | |
Crystal structure | sphalerite |
Thermochemistry | |
Heat capacity (C) | 178 J kg−1 K−1 |
Std enthalpy of formation (ΔfH⦵298) | 247 kJ/mol |
Hazards | |
GHS labelling: | |
Pictograms | |
Danger | |
Hazard statements | H300, H310, H330, H373, H410 |
Precautionary statements | P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P304+P340, P310, P314, P320, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501 |
NFPA 704 (fire diamond) | 3 0 1 |
Flash point | Non-flammable |
Related compounds | |
Other anions | Mercury oxide Mercury sulfide Mercury telluride |
Other cations | Zinc selenide Cadmium selenide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references |
Mercury selenide (HgSe; sometimes mercury(II) selenide) 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.
HgSe occurs naturally as the mineral Tiemannite, and is a component of the "intimate mixture" of HgSe and Se known as HgSe2.[1]
Along with other II-VI compounds, colloidal nanocrystals of HgSe can be formed.
Applications
- 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
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.[2]
See also
References
- ^ Park, Chang-Woo; Smith, Donna M.; Pell, Michael A.; Ibers, James A. (1997). "Different Products from the Chemical and Electrochemical Reduction of 'HgSe2': [K(2.2.2-cryptand)]2[HgSe2] and [PPh4]2[Hg(Se4)2]·en". Inorg. Chem. 36 (5): 942–943. doi:10.1021/ic960786v.
- ^ Watanabe, C. (2002). "Modification of Mercury Toxicity by Selenium: Practical Importance?". The Tohoku Journal of Experimental Medicine. 196 (2): 71–77. doi:10.1620/tjem.196.71. PMID 12498318.
- Nelson, D.; Broerman, J.; Paxhia, E.; Whitsett, C. (1969). "Resonant Phonon Scattering in Mercury Selenide". Physical Review Letters. 22 (17): 884. Bibcode:1969PhRvL..22..884N. doi:10.1103/PhysRevLett.22.884.
- Jayaraman, A.; Klement, W.; Kennedy, G. (1963). "Melting and Polymorphic Transitions for Some Group II-VI Compounds at High Pressures". Physical Review. 130 (6): 2277. Bibcode:1963PhRv..130.2277J. doi:10.1103/PhysRev.130.2277.
- Gawlik, K. -U.; Kipp, L.; Skibowski, M.; Orłowski, N.; Manzke, R. (1997). "HgSe: Metal or Semiconductor?" (PDF). Physical Review Letters. 78 (16): 3165. Bibcode:1997PhRvL..78.3165G. doi:10.1103/PhysRevLett.78.3165..
- Kumazaki, K. (1990). "Dielectric properties of narrow-gap semiconductors". Journal of Crystal Growth. 101 (1–4): 687–690. Bibcode:1990JCrGr.101..687K. doi:10.1016/0022-0248(90)91059-Y.
- SNV (1991) Guidelines on measures and methods for heavy metal emissions control. Solna, The Swedish Environmental Protection Agency – Naturvårdsverket.
External links
- https://web.archive.org/web/20051019034837/http://ctdp.ensmp.fr/species/Tiemannite.html
- v
- t
- e
- HgH
- Hg2H2
- Hg2Br2
- Hg2Cl2
- Hg2F2
- Hg2I2
- Hg2(NO3)2
- Hg2O
- Hg2CO3
- Hg2SO4
- Hg2S (hypothetical)
Organomercury compounds |
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- HgF4 (hypothetical)
- Hg2+
- Hg22+
- Hg32+
- Hg42+
- Hg34+
- HgCH3+
- HgC2H5+
- HgC6H5+