Selenium dioxide

Selenium dioxide
Selenium dioxide
Ball-and-stick model of a chain in crystalline selenium dioxide
Crystals of selenium dioxide
Names
Other names
Selenium(IV) oxide
Selenous anhydride
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.028.358 Edit this at Wikidata
EC Number
  • 231-194-7
RTECS number
  • VS8575000
UNII
UN number 3283
  • InChI=1S/O2Se/c1-3-2 checkY
    Key: JPJALAQPGMAKDF-UHFFFAOYSA-N checkY
  • InChI=1/O2Se/c1-3-2
    Key: JPJALAQPGMAKDF-UHFFFAOYAQ
  • monomer: O=[Se]=O
  • polymer: O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O[Se](=O)O
Properties
SeO2
Molar mass 110.96 g/mol
Appearance White crystals, turn slightly pink with trace decomposition[1]
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
> 1.76
Structure
see text
trigonal (Se)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Toxic by ingestion and inhalation[2]
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
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)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
5890 mg/m3 (rabbit, 20 min)
6590 mg/m3 (goat, 10 min)
6590 mg/m3 (sheep, 10 min)[3]
Safety data sheet (SDS) ICSC 0946
Related compounds
Other anions
 Selenium disulfide
Other cations
 Ozone
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).
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Selenium dioxide is the chemical compound with the formula SeO2. This colorless solid is one of the most frequently encountered compounds of selenium. It is used in making specialized glasses as well as a reagent in organic chemistry.[4]

  1. ^ "Safety data sheet: Selenium dioxide" (PDF). integrachem.com. 27 March 2015. Retrieved 2022-12-02.
  2. ^ "Selenium dioxide safety and hazards". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-12-02.
  3. ^ "Selenium compounds (as Se)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Hoekstra, William J.; Fairlamb, Ian J. S.; Giroux, Simon; Chen, Yuzhong (2017). "Selenium(IV) Oxide". Encyclopedia of Reagents for Organic Synthesis. pp. 1–12. doi:10.1002/047084289X.rs008.pub3. ISBN 978-0-470-84289-8.