Back ثلاثي أكسيد السيلينيوم Arabic تریاوکسید سلنیوم AZB Oxid selenový Czech Selentrioxid German Trióxido de selenio Spanish تری‌اکسید سلنیوم Persian Seleenitrioksidi Finnish सेलेनियम ट्राइऑक्साइड Hindi Selenium trioksida ID Triossido di selenio Italian

Selenium trioxide

Selenium trioxide[1]
Structural formula of the monomer as found in the gas phase
Structural formula of the monomer as found in the gas phase
Space-filling model of the monomer as found in the gas phase
Space-filling model of the monomer as found in the gas phase
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.972 Edit this at Wikidata
  • InChI=1S/O3Se/c1-4(2)3 checkY
    Key: VFLXBUJKRRJAKY-UHFFFAOYSA-N checkY
  • InChI=1/O3Se/c1-4(2)3
    Key: VFLXBUJKRRJAKY-UHFFFAOYAC
  • monomer: O=[Se](=O)=O
  • cyclic tetramer: O=[Se]0(=O)O[Se](=O)(=O)O[Se](=O)(=O)O[Se](=O)(=O)O0
Properties
SeO3
Molar mass 126.96 g/mol
Appearance white hygroscopic crystals
Density 3.44 g/cm3
Melting point 118.35 °C (245.03 °F; 391.50 K)
Boiling point sublimes
very soluble
Structure
tetragonal
Hazards
GHS labelling:[3]
GHS06: ToxicGHS09: Environmental hazard
Danger
H301, H331, H373, H410
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
4
0
2
OX
Lethal dose or concentration (LD, LC):
7 mg/kg (rat, oral)
7.08 mg/kg (mouse, oral)
5.06 mg/kg (guinea pig, oral)
2.25 mg/kg (rabbit, oral)
13 mg/kg (horse, oral)[2]
13 mg/kg (pig, oral)
9.9 mg/kg (cow, oral)
3.3 mg/kg (goat, oral)
3.3 mg/kg (sheep, oral)[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Selenium trioxide is the inorganic compound with the formula SeO3. It is white, hygroscopic solid. It is also an oxidizing agent and a Lewis acid. It is of academic interest as a precursor to Se(VI) compounds.[4]

  1. ^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–81. ISBN 0-8493-0594-2.
  2. ^ a b "Selenium compounds (as Se)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  3. ^ "C&L Inventory". echa.europa.eu. Retrieved 16 December 2021.
  4. ^ Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0123526515

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