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| CAS No.: | 18868-43-4 |
|---|---|
| Name: | MOLYBDENUM (IV) OXIDE |
| Molecular Structure: | |
|
|
|
| Formula: | MoO2 |
| Molecular Weight: | 127.94 |
| Synonyms: | Molybdenumdioxide;Molybdenum(IV) oxide; |
| EINECS: | 242-637-9 |
| Density: | 6.47 g/mL at 25 °C(lit.) |
| Melting Point: | decomposes [JAN85] |
| Solubility: | slightly soluble H2SO4; insoluble HCl, HF, and alkalies [HAW93] |
| Hazard Symbols: |
 Xn
|
| Risk Codes: | 20/21/22-36/37/38 |
| Safety: | 26-36 |
| PSA: | 34.14000 |
| LogP: | -0.23760 |
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Chemistry
Chemistry informtion about Molybdenum(IV) Oxide (CAS NO.18868-43-4) is:
IUPAC Name: Dioxomolybdenum
Synonyms: Molybdenum Dioxide ; Molybdenum (Iv) Oxide ; Molybdenum Oxide ; Molybdenum Oxide Brown ; Molybdenum Oxide (Moo2) ; Molybdenumoxide(Moo2) ; Moo2 ; Molybdenum(Iv) Oxide, 99.95%
Product Categories: Inorganics ; Metal and Ceramic Science ; Molybdenum ; Oxides
MF: MoO2
MW: 127.94
EINECS: 242-637-9
Density: 6.47 g/mL at 25 °C(lit.)
Following is the molecular structure of Molybdenum(IV) Oxide (CAS NO.18868-43-4) is:
Uses
MoO2 has been reported as catalysing the dehydrogenation of alcohols and the reformation of hydrocarbons. Molybdenum nano-wires have been produced by reducing MoO2 deposited on graphite.Mineralogical form of this compound is called tugarinovite, only very rarely found.
Production
Molybdenum(IV) Oxide (CAS NO.18868-43-4) can be prepared: by reduction of MoO3 with Mo over the course of 70 hours at 800 °C. The tungsten analogue, WO2, is prepared similarly.
2 MoO3 + Mo → 3 MoO2
by reducing MoO3 with H2 or NH3 below 470°C [2]
Single crystals are obtained by chemical transport using iodine. Iodine reversibly converts MoO2 into the volatile species MoO2I2. Molybdenum oxide is a constituent of "technical molybdenum oxide" produced during the industrial processing of MoS2:
2 MoS2 + 7O2 → 2MoO3 + 4SO2
MoS2 + 6MoO3 → 7MoO2 + 2SO2
2 MoO2 + O2 → 2MoO3
Toxicity Data With Reference
| 1. | scu-mus LD50:318 mg/kg | ZVKOA6 Zhurnal Vsesoyuznogo Khimicheskogo Obshchestva Imeni D.I. Mendeleeva. Journal of the D.I. Mendeleeva All-Union Chemical Society. 19 (1974),186. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
Poison by subcutaneous route. Incandescent reaction with air. When heated to decomposition it emits toxic fumes of Mo. See also MOLYBDENUM COMPOUNDS.
Hazard Codes:
Xn
Risk Statements:
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements:
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36:Wear suitable protective clothing.
WGK Germany: 1
RTECS: QA4688000
Standards and Recommendations
OSHA PEL: TWA 10 mg(Mo)/m3, total dust; TWA 5 mg(Mo)/m3, respirable fraction
ACGIH TLV: Insoluble Compounds: inhalable fraction, 10 mg(Mo)/m3, 3 mg(Mo)/m3, respirable fraction.
Specification
Molybdenum(IV) Oxide (CAS NO.18868-43-4) is a violet-colored solid and is a metallic conductor. It crystallizes in a monoclinic cell, and has a distorted rutile, (TiO2) crystal structure. In MoO2 the octahedra are distorted, the Mo atoms are off-centre, leading to alternating short and long Mo – Mo distances. The short Mo – Mo distance is 251 pm which is less than the Mo – Mo distance in the metal, 272.5 pm. The bond length is shorter than would be expected for a single bond. The bonding is complex and involves a delocalisation of some of the Mo electrons in a conductance band accounting for the metallic conductivity.