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Osmium tetroxide

Names Preferred IUPAC nameOsmium tetraoxideSystematic IUPAC nameTetraoxoosmiumOther names Osmium(VIII) oxideIdentifiers CAS Number20816-12-03D model (JSmol)Interactive imageChEBICHEBI:88215ChemSpider28158ECHA InfoCard100.040.038EC Number244-058-7MeSHOsmium+tetroxidePubChemCID30318RTECS numberRN1140000UNIIP40W033BGMUN numberUN 2471 CompTox Dashboard(EPA)DTXSID5042245InChIInChI=1S/4O.OsKey: VUVGYHUDAICLFK-UHFFFAOYSA-NInChI=1S/4O.OsKey: VUVGYHUDAICLFK-UHFFFAOYSA-NInChI=1/4O.Os/rO4Os/c1-5(2,3)4Key: VUVGYHUDAICLFK-TYHKRQCIAESMILESO=[Os](=O)(=O)=OProperties Chemical formulaOsO4Molar mass254.23g/mol Appearance White volatile solid OdorAcrid, chlorine-like Density4.9g/cm Melting point40.25 °C (104.45 °F; 313.40 K) Boiling point129.7 °C (265.5 °F; 402.8 K) Solubility in water5.70g/100mL (10 °C) 6.23g/100mL (25 °C) SolubilitySoluble in most organic solvents, ammonium hydroxide, phosphorus oxychlorideSolubility in CCl4375g/100mL Vapor pressure7mmHg (20 °C) Structure Crystal structureMonoclinic, mS20Space groupC2/c Lattice constanta = 9.379 Å, b = 4.515 Å, c = 8.630 Åα = 90°, β = 116.58°, γ = 90°Lattice volume (V)326.8 Å Formula units (Z)4 Molecular shapetetrahedral Hazards GHS labelling: PictogramsSignal wordDangerHazard statementsH300, H310, H314, H330Precautionary statementsP260, P262, P264, P270, P271, P280, P284, P301+P310, P301+P330+P331, P302+P350, P303+P361+P353, P304+P340, P305+P351+P338, P310, P320, P321, P330, P361, P363, P403+P233, P405, P501NFPA 704 (fire diamond) 301OXLethal dose or concentration (LD, LC): LCLo (lowest published)1316mg/m (rabbit, 30min)423mg/m (rat, 4hr)423mg/m (mouse, 4hr) NIOSH (US health exposure limits): PEL (Permissible)TWA 0.002mg/m REL (Recommended)TWA 0.002mg/m (0.0002ppm) ST 0.006mg/m (0.0006ppm) IDLH (Immediate danger)1 mg/m Safety data sheet (SDS) ICSC 0528Related compounds Other cationsRuthenium tetroxideHassium tetroxideRelated osmiumoxidesOsmium(IV) oxideExcept where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Nverify ( ?)

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