Hydrogen selenide
Hydrogen selenide is an inorganic compound with the formula H2Se. This hydrogen chalcogenide is the simplest and most commonly encountered hydride of selenium. H2Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound with an exposure limit of 0.05 ppm over an 8-hour period. Even at extremely low concentrations, this compound has a very irritating smell resembling that of decayed horseradish or "leaking gas", but smells of rotten eggs at higher concentrations.
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| Names | |||
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| IUPAC name
Hydrogen selenide | |||
| Other names
Hydroselenic acid selane selenium hydride | |||
| Identifiers | |||
3D model (JSmol) |
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| ChEBI | |||
| ChemSpider | |||
| ECHA InfoCard | 100.029.071 | ||
| EC Number |
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| KEGG | |||
PubChem CID |
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| RTECS number |
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| UNII | |||
| UN number | 2202 | ||
CompTox Dashboard (EPA) |
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SMILES
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| Properties | |||
| H2Se | |||
| Molar mass | 80.98 g/mol | ||
| Appearance | Colorless gas | ||
| Odor | decayed horseradish | ||
| Density | 3.553 g/dm3 | ||
| Melting point | −65.73 °C (−86.31 °F; 207.42 K) | ||
| Boiling point | −41.25 °C (−42.25 °F; 231.90 K) | ||
| 0.70 g/100 mL | |||
| Solubility | soluble in CS2, phosgene | ||
| Vapor pressure | 9.5 atm (21°C) | ||
| Acidity (pKa) | 3.89 | ||
| Conjugate acid | Selenonium | ||
| Conjugate base | Selenide | ||
| Structure | |||
Molecular shape |
Bent | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards |
Extremely toxic and flammable | ||
| GHS labelling: | |||
| Danger | |||
| H220, H280, H330, H410 | |||
| P210, P260, P271, P273, P284, P304+P340, P310, P320, P377, P381, P391, P403, P403+P233, P405, P410+P403, P501 | |||
| NFPA 704 (fire diamond) |
4
4
0 | ||
| Flash point | flammable gas | ||
| Lethal dose or concentration (LD, LC): | |||
LCLo (lowest published) |
0.3 ppm (guinea pig, 8 hr) 5.9 ppm (rat, 1 hr) | ||
| NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 0.05 ppm (0.2 mg/m3) | ||
REL (Recommended) |
TWA 0.05 ppm (0.2 mg/m3) | ||
IDLH (Immediate danger) |
1 ppm | ||
| Safety data sheet (SDS) | ICSC 0284 | ||
| Related compounds | |||
Other anions |
H2O H2S H2Te H2Po | ||
Other cations |
Na2Se Ag2Se | ||
Related compounds |
Arsine | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
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