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Manganese(II) molybdate
Names
	IUPAC name Manganese(2+) molybdate
Identifiers
CAS Number	14013-15-1;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.034.371
EC Number	237-823-1;
PubChem CID	84155;
CompTox Dashboard (EPA)	DTXSID801030492 ;
	InChI InChI=1S/Mn.Mo.4O/q+2;;;;2*-1 Key: QYZFLCQIQOHNTP-UHFFFAOYSA-N;
	SMILES [O-][Mo](=O)(=O)[O-].[Mn+2];
Properties
Chemical formula	MnMoO4
Molar mass	214.876 g/mol (anhydrous) ; 232.901 g/mol (monohydrate)
Appearance	white-yellow to beige crystals or powder
Density	4.02 g/cm3
Melting point	1,130 °C (2,070 °F; 1,400 K)
Solubility in water	insoluble
Refractive index (nD)	2.11
Hazards
NFPA 704 (fire diamond)	3 0 0
	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]

Na₂MoO₄ + MnSO₄ → Na₂SO₄ + MnMoO₄

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]

Potential applications

MnMoO₄ serves as the active material in electrodes for aqueous supercapacitors^[2]^[5] due to fast pseudocapacitive redox reactions. It has been evaluated as catalyst for hydrogen evolution.^[5]

References

^ ^a ^b ^c ^d 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.
^ ^a ^b "Synthesis and Characterization of Manganese Molybdate for Symmetric Capacitor Applications (PDF Download Available)". ResearchGate. Retrieved 2017-03-10.
^ 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.
^ ^a ^b Yan, Xiaodong; Tian, Lihong; Murowchick, James; Chen, Xiaobo (2016-03-01). "Partially amorphized MnMoO4for highly efficient energy storage and the hydrogen evolution reaction". J. Mater. Chem. A. 4 (10): 3683–3688. doi:10.1039/c6ta00744a. ISSN 2050-7496.

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[PrepMnMoO4-1] 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.

[:0-2] "Synthesis and Characterization of Manganese Molybdate for Symmetric Capacitor Applications (PDF Download Available)". ResearchGate. Retrieved 2017-03-10.

[3] 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.

[TransitionMetalMolybdates-4] 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.

[:1-5] Yan, Xiaodong; Tian, Lihong; Murowchick, James; Chen, Xiaobo (2016-03-01). "Partially amorphized MnMoO4for highly efficient energy storage and the hydrogen evolution reaction". J. Mater. Chem. A. 4 (10): 3683–3688. doi:10.1039/c6ta00744a. ISSN 2050-7496.

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