Molybdenum dioxide

Base Information

• Chemical Name: Molybdenum dioxide
• CAS No.: 18868-43-4
• Deprecated CAS: 12058-08-1
• Molecular Formula: MoO2
• Molecular Weight: 127.94
• Hs Code.: 28257000
• European Community (EC) Number: 242-637-9
• DSSTox Substance ID: DTXSID10879986
• Wikipedia: Molybdenum(IV) oxide
• Wikidata: Q415673
• Mol file: 18868-43-4.mol

Synonyms:molybdenum dioxide;MoO2

Chemical Property of Molybdenum dioxide

Chemical Property:

• Melting Point: decomposes [JAN85]
• PSA: 34.14000
• Density: 6.47 g/mL at 25 °C(lit.)
• LogP: -0.23760
• Water Solubility.: slightly soluble H2SO4; insoluble HCl, HF, and alkalies [HAW93]
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 2
• Rotatable Bond Count: 0
• Exact Mass: 129.895233
• Heavy Atom Count: 3
• Complexity: 18.3

Purity/Quality:

99.9% ^*data from raw suppliers

Molybdenum(IV) oxide, 99% ^*data from reagent suppliers

Safty Information:

• Pictogram(s): Xn
• Hazard Codes: Xn
• Statements: 20/21/22-36/37/38
• Safety Statements: 26-36

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Metals -> Metals, Inorganic Compounds
• Canonical SMILES: O=[Mo]=O
• Physical properties: Molybdenum(IV) oxide can be prepared by several methods including controlled oxidation of Mo and controlled reduction of MoO3 with hydrogen. The pure oxide suitable for structure determination has been prepared by electrolysis of a polymolybdate (K2O5.MoO3) solution. Molybdenum(IV) oxide is insoluble in water: it is inert in solutions of nonoxidizing acids or bases, but is dissolved by oxidizing solutions. It dissociates to Mo and MoO3 at high temperatures (~ 1100°).Crystalline MoO2 is violet or brown. Its deformed rutile structure consists of infinite chains of MoO6 octahedra sharing opposite edges along the chain direction with Mo-Mo distances alternately long (3.10 A) and short (2.50 A). It is diamagnetic and semiconducting ; metal-metal bonds are present. Some of its thermodynamic properties are as follows: G°f29% ~ 172.415 kcal/mole H°f29% -140.5 kcal/mole S°298 11.954 gibbs/mole.
• uses: Molybdenum(IV) oxide (MoO2) is a transition metal oxide with good electrical conductivity due to the presence of delocalized electrons in its valence band. It is traditionally prepared by reducing MoO3 in dry hydrogen in the temperature range of 450-550°C. MoO2 can be used in a variety of energy based applications such as an anode material in rechargeable lithium batteries and fuel flexible solid oxide fuel cells.It can also be used as a catalyst in hydrogen reforming processes.
• Uses: Molybdenum(IV) oxide is used to catalyze the dehydrogenation of alcohols. It is also used as an intermediates and processing aids. It finds application in the manufacture of molybdenum nano-wires.