Chemistry:Manganese(II) molybdate
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| Names | |
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| IUPAC name
Manganese(2+) molybdate
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| Identifiers | |
3D model (JSmol)
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| EC Number |
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PubChem CID
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| Properties | |
| MnMoO4 | |
| Molar mass | 214.876 g/mol (anhydrous) 232.901 g/mol (monohydrate) |
| Appearance | white-yellow to beige crystals or powder [1] |
| Density | 4.02 g/cm3 |
| Melting point | 1,130 °C (2,070 °F; 1,400 K) |
| insoluble | |
Refractive index (nD)
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2.11 |
| Hazards | |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Manganese(II) molybdate is an inorganic compound with the chemical formula MnMoO4. α-MnMoO4 has a monoclinic crystal structure.[2] It is also antiferromagnetic at low temperatures.[3]
Synthesis
Manganese(II) molybdate can be prepared through a double displacement reaction between sodium molybdate and manganese sulphate:[1]
Manganese(II) molybdate has minimal solubility in water and will form a white-yellow precipitate which turns beige upon being refluxed.[1] The precipitate can then be filtered from solution, which gives the monohydrate (MnMoO4·H2O); heating to 360 °C then provides the anhydrous salt.[1]
Manganese(II) molybdate may also be prepared by heating various manganese oxides and molybdenum trioxide to 700 °C.[4]
Applications
MnMoO4 has been used as active material in electrodes for aqueous supercapacitors[2][5] due to fast pseudocapacitive redox reactions, and as catalyst for hydrogen evolution.[5]
References
- ↑ 1.0 1.1 1.2 1.3 Clearfield, A.; Moini, A.; Rudolf, P. R. (1985-12-01). "Preparation and Structure of Manganese Molybdates". Inorganic Chemistry 24 (26): 4606–4609. doi:10.1021/ic00220a035.
- ↑ 2.0 2.1 "Synthesis and Characterization of Manganese Molybdate for Symmetric Capacitor Applications (PDF Download Available)" (in en). https://www.researchgate.net/publication/268809383.
- ↑ Ehrenberg, H.; Schwarz, B.; Weitzel, H. (2006-10-01). "Magnetic phase diagrams of -MnMoO4". Journal of Magnetism and Magnetic Materials 305 (1): 57–62. doi:10.1016/j.jmmm.2005.11.027.
- ↑ Doyle, W. P.; McGuire, G.; Clark, G. M. (1996-05-01). "Preparation and Properties of Transition Metal Molybates (VI)". Inorganic and Nuclear Chemistry 28 (5): 1185–1190. doi:10.1016/0022-1902(66)80444-X.
- ↑ 5.0 5.1 Yan, Xiaodong; Tian, Lihong; Murowchick, James; Chen, Xiaobo (2016-03-01). "Partially amorphized MnMoO4for highly efficient energy storage and the hydrogen evolution reaction" (in en). J. Mater. Chem. A 4 (10): 3683–3688. doi:10.1039/c6ta00744a. ISSN 2050-7496.
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