Molybdenum trioxide

Molybdenum trioxide
Names
IUPAC name
Molybdenum trioxide
Other names
Molybdic anhydride
Molybdite
Molybdic trioxide
Molybdenum(VI) oxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.823 Edit this at Wikidata
EC Number
  • 215-204-7
UNII
UN number 3288
  • InChI=1S/Mo.3O
    Key: JKQOBWVOAYFWKG-UHFFFAOYSA-N
  • O=[Mo](=O)=O
Properties
MoO3
Molar mass 143.95 g·mol−1
Appearance yellow solid
Odor odorless
Density 4.70 g/cm3[1]
Melting point 802 °C (1,476 °F; 1,075 K)[1]
Boiling point 1,155 °C (2,111 °F; 1,428 K)(sublimes)[1]
1.066 g/L (18 °C)
4.90 g/L (28 °C)
20.55 g/L (70 °C)
Band gap >3 eV (direct)[2]
+3.0·10−6 cm3/mol[3]
Structure[4]
Orthorhombic, oP16
Pnma, No. 62
a = 1.402 nm, b = 0.37028 nm, c = 0.39663 nm
4
see text
Thermochemistry[5]
75.0 J K−1 mol−1
77.7 J K−1 mol−1
−745.1 kJ/mol
-668.0 kJ/mol
Hazards[7]
GHS labelling:
GHS07: Exclamation markGHS08: Health hazard
Warning
H319, H335, H351
P201, P202, P261, P264, P271, P280, P281, P304+P340, P305+P351+P338, P308+P313, P312, P337+P313, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability (yellow): no hazard codeSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
3
0
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
125 mg.kg (rat, oral)[citation needed]
2689 mg/kg (rat, oral)[6]
120 mg Mo/kg (rat, oral)
120 mg Mo/kg (guinea pig, oral)[6]
>5840 mg/m3 (rat, 4 hr)[6]
Related compounds
Other cations
Chromium trioxide
Tungsten trioxide
Molybdenum dioxide
"Molybdenum blue"
Related compounds
Molybdic acid
Sodium molybdate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Molybdenum trioxide describes a family of inorganic compounds with the formula MoO3(H2O)n where n = 0, 1, 2. The anhydrous compound is produced on the largest scale of any molybdenum compound since it is the main intermediate produced when molybdenum ores are purified. The anhydrous oxide is a precursor to molybdenum metal, an important alloying agent. It is also an important industrial catalyst.[8] It is a yellow solid, although impure samples can appear blue or green.

Molybdenum trioxide occurs as the rare mineral molybdite.

  1. ^ a b c Haynes, p. 4.77
  2. ^ Balendhran, Sivacarendran; Walia, Sumeet; Nili, Hussein; Ou, Jian Zhen; Zhuiykov, Serge; Kaner, Richard B.; Sriram, Sharath; Bhaskaran, Madhu; Kalantar-zadeh, Kourosh (2013-08-26). "Two-Dimensional Molybdenum Trioxide and Dichalcogenides". Advanced Functional Materials. 23 (32): 3952–3970. doi:10.1002/adfm.201300125. S2CID 95301280.
  3. ^ Haynes, p. 4.134
  4. ^ Åsbrink, S.; Kihlborg, L.; Malinowski, M. (1988). "High-pressure single-crystal X-ray diffraction studies of MoO3. I. Lattice parameters up to 7.4 GPa". J. Appl. Crystallogr. 21 (6): 960–962. doi:10.1107/S0021889888008271.
  5. ^ Haynes, p. 5.15
  6. ^ a b c "Molybdenum (soluble compounds, as Mo)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  7. ^ "Molybdenum trioxide". PubChem.
  8. ^ Roger F. Sebenik; et al. (2005). "Molybdenum and Molybdenum Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a16_655. ISBN 978-3527306732.