Selenium dioxide
Selenium dioxide is the chemical compound with the formula SeO2. This colorless solid is one of the most frequently encountered compounds of selenium.
| Names | |
|---|---|
| Other names
Selenium(IV) oxide Selenous anhydride | |
| Identifiers | |
3D model (JSmol) |
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| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.028.358 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 3283 |
CompTox Dashboard (EPA) |
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| Properties | |
| SeO2 | |
| Molar mass | 110.96 g/mol |
| Appearance | White crystals, turn slightly pink with trace decomposition |
| Odor | rotten radishes |
| Density | 3.954 g/cm3, solid |
| Melting point | 340 °C (644 °F; 613 K) (sealed tube) |
| Boiling point | 350 °C (662 °F; 623 K) subl. |
| 38.4 g/100 mL (20 °C) 39.5 g/100 ml (25 °C) 82.5 g/100 mL (65 °C) | |
| Solubility | soluble in benzene |
| Solubility in ethanol | 6.7 g/100 mL (15 °C) |
| Solubility in acetone | 4.4 g/100 mL (15 °C) |
| Solubility in acetic acid | 1.11 g/100 mL (14 °C) |
| Solubility in methanol | 10.16 g/100 mL (12 °C) |
| Vapor pressure | 1.65 kPa (70 °C) |
| Acidity (pKa) | 2.62; 8.32 |
| −27.2·10−6 cm3/mol | |
Refractive index (nD) |
> 1.76 |
| Structure | |
| see text | |
| trigonal (Se) | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
Toxic by ingestion and inhalation |
| GHS labelling: | |
| Danger | |
| H301, H331, H373, H410 | |
| P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
LCLo (lowest published) |
5890 mg/m3 (rabbit, 20 min) 6590 mg/m3 (goat, 10 min) 6590 mg/m3 (sheep, 10 min) |
| Safety data sheet (SDS) | ICSC 0946 |
| Related compounds | |
Other anions |
Selenium disulfide |
Other cations |
Sulfur dioxide Tellurium dioxide |
| Selenium trioxide | |
Related compounds |
Selenous acid |
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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