Manganese(II) molybdate
Inorganic compound
From Wikipedia, the free encyclopedia
Manganese(II) molybdate is an inorganic compound with the chemical formula MnMoO4. α-MnMoO4 has a monoclinic crystal structure.[3] It is also antiferromagnetic at low temperatures.[4]
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| Names | |
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| IUPAC name
Manganese(II) molybdate | |
Other names
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| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.034.371 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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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) |
2.11 |
| Hazards | |
| GHS labelling:[2] | |
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| Danger | |
| H360 | |
| P203, P280, P318, P405, P501 | |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.[5]
Potential applications
MnMoO4 serves as the active material in electrodes for aqueous supercapacitors[3][6] due to fast pseudocapacitive redox reactions. It has been evaluated as catalyst for hydrogen evolution.[6]
