Tungsten dioxide
Basic information
- CAS
12036-22-5- Standard SMILES
[O]=[W]=[O]- InChIKey
DZKDPOPGYFUOGI-UHFFFAOYSA-N- Molecular formula
- O2W
- Average molar mass
- 215.84 g/mol
- Monoisotopic mass
- 215.940762
Names & identifiers
- Preferred name
- Tungsten dioxide
- IUPAC
- dioxotungsten
- English name
- Tungsten (IV) oxide
- Molecular formula
- O2W
- Molecular weight
- 215.84
Names & synonyms
Tungsten(IV) oxideTungsten dioxideTungsten oxide (WO2)Tungsten (IV) oxideUNII-0Q43JGJ0GVEINECS 234-842-70Q43JGJ0GVDTXSID0065195EC 234-842-7RefChem:192524DTXCID7033604234-842-7
Show more names
WO2.72TUNGSTEN OXIDETungsten(Ⅳ)oxideWolfram(IV)dioxideWO2,99.9%(metalsbasis)
TUNGSTEN OXIDE (O2W)12036-22-5dioxotungsten12037-58-0MFCD00049709Tungsten(IV) oxide (99.9+per cent-W) (WO2.9 Blue Sub-oxide)WO2Bis(oxido)tungsten
Database identifiers
- CAS
12036-22-5- PubChem CID
- 82850
- DTXSID
DTXSID0065195- EC Number
- 234-842-7
- Nikkaji
- J95.261C
Properties
Computed structural properties
- Topological polar surface area
- 34.1 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 2
- Rotatable bonds
- 0
- Heavy atoms
- 3
- Formal charge
- 0
- Complexity
- 18.3
Experimental & physicochemical properties
Chemical ClassesMetals -> Metals, Inorganic Compounds
Density10.8 @25 °C
Physical DescriptionDark blue or brown odorless powder; [MSDSonline]
Physicochemical properties
- Melting point
- 1500 · 1500-1600°C
- Boiling point
- 1730 ℃[at · 1730℃[at 101 325 Pa]
- Density
- 12 · 12,11 g/cm3
- solubility
- 2 O, · insoluble in H2O, organic solvents
- form
- Powder
- Specific Gravity
- 12.11 · 12.11
- color
- brown
- Water Solubility
- Soluble in acid and potassium hydroxide. Insoluble in water.
- Specific Heat Capacity
- 0.26 J/ · Cp(crystal): 0.26 J/(g·K), at 25℃
- Crystal Structure
- 2 type · MoO2 type
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 12.5% (2 of 16) of reports.
Warning
H335 (87.5%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
P261, P271, P273, P304+P340, P319, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 16 reports by companies from 5 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard information
Regulatory InformationREACH registered substance: Tungsten dioxide (EC: 234-842-7)
Hazards SummaryAn irritant; [MSDSonline]
Hazard Classes and CategoriesSTOT SE 3 (87.5%)
Safety & protection
Threshold Limit Values (TLV)3.0 [mg/m3], as W, respirable particulate matter
Protective Action Criteria (PAC)
12 [mg/m3]
390 [mg/m3]
2300 [mg/m3]
Safety data
- PPE
- dust mask type N95 (US), Eyeshields, Gloves
- wgk
- 3
- tsca
- TSCA listed
- risk_code
- 37
Chemistry & industry
Uses & manufacturing
General Manufacturing InformationTungsten oxide (WO2): ACTIVE
Applications
DescriptionTungsten(IV) oxide, WO2, is a bronze-colored solid that crystallizes in a monoclinic cell. The rutile-like structure features distorted octahedral WO6 centers with alternate short W-W bonds (248 pm). Each tungsten center has the d2 configuration, which gives the material a high electrical conductivity. WO2 is prepared by reduction of WO3 with tungsten powder in about 40 h at 900℃. An intermediate in this reaction is the partially reduced, mixed valence species W18O49. 2WO3 + W→3WO2
UsesTungsten(IV) oxide is used in the production of tungsten and tungstates, in alloys, in fire-proofing fabrics and as a ceramic pigment. It is used to study their chromism, photocatalysis and sensing capabilities. It is associated with rhenium trioxide particles and used for detection of protonatable, radical and precharged species under laser desorption ionization.
Upstream & downstream products
Upstream raw materials
Related reactions
0 records
No reaction records under the current filter.
Compound notes
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