Manganese oxalate

Manganese oxalate is a chemical compound, a salt of manganese and oxalic acid with the chemical formula MnC
₂O
₄.^[2][3] The compound creates light pink crystals, does not dissolve in water, and forms crystalline hydrates.^[4] It occurs naturally as the mineral Lindbergite.^[5]

Manganese oxalate

Names
Other names Manganese(II) oxalate, Manganese(2+) oxalate, Lindbergite
Identifiers
CAS Number	640-67-5^Y
3D model (JSmol)	Interactive image
ChemSpider	62705
ECHA InfoCard	100.010.335
EC Number	211-367-3
PubChem CID	69499
UNII	A8PK5I86G8^Y
CompTox Dashboard (EPA)	DTXSID90894218
InChI InChI=1S/C2H2O4.Mn/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+2/p-2 Key: RGVLTEMOWXGQOS-UHFFFAOYSA-L
SMILES C(=O)(C(=O)[O-])[O-].[Mn+2]
Properties
Chemical formula	C2MnO4
Molar mass	142.956 g·mol^−1
Appearance	Light pink crystals
Density	2.43
Solubility in water	insoluble
Solubility product (Ksp)	1.7×10^−7^[1]
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312
Precautionary statements	P264, P270, P280, P301+P312, P302+P352, P312, P322, P330, P363, P501
Related compounds
Related compounds	Magnesium oxalate Strontium oxalate Barium oxalate Iron(II) oxalate Iron(III) oxalate Praseodymium oxalate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Exchange reaction between sodium oxalate and manganese chloride:

${\displaystyle {\mathsf {MnCl_{2}+Na_{2}C_{2}O_{4}+2H_{2}O\ {\xrightarrow {}}\ MnC_{2}O_{4}\cdot 2H_{2}O\downarrow +2NaCl}}}$ 

Physical properties

Manganese oxalate forms light pink crystals.

It does not dissolve in water, p K_sp= 6.8.

Forms crystalline hydrates of the composition MnC₂O₄•n H₂O, where n = 2 and 3.^[6]

Crystalline hydrate of the composition MnC₂O₄•2H₂O forms light pink crystals of the orthorhombic system, space group P2₁2₁2₁, cell parameters a = 0.6262 nm, b = 1.3585 nm, c = 0.6091 nm, Z = 4, melts in its own crystallization water at 100°C.^[7][8]

Chemical properties

Decomposes on heating:

${\displaystyle {\mathsf {MnC_{2}O_{4}\ {\xrightarrow {215^{o}C}}\ MnO+CO\uparrow +CO_{2}\uparrow }}}$ 

Application

• Manganese oxalate is used as an auxiliary siccative.
• Manganese oxalate precursor is used to synthesize single phase nanoparticles of various manganese oxides, such as MnO, Mn
  ₂O
  ₃, and Mn
  ₃O
  ₄.^[9]

See also

• Iron oxalate

References

1. John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
2. Lunge, Georg (1924). Lunge and Keane's Technical Methods of Chemical Analysis. 2d Ed., Edited by Charles A. Keane ...and P.C.L. Thorne. Gurney and Jackson. p. 61. Retrieved 5 August 2021.
3. Young, Philena Anne (1928). The Volumetric Determination of Vanadium and Chromium in Special Alloy Steels: Ceric Sulfate as a Volumetric Oxidizing Agent. Mack Printing Company. p. 74. Retrieved 5 August 2021.
4. Donkova, B.; Mehandjiev, D. (2004). "Mechanism of decomposition of manganese(II) oxalate dihydrate and manganese(II) oxalate trihydrate". Thermochimica Acta. 421 (1–2): 141–149. doi:10.1016/j.tca.2004.04.001. ISSN 0040-6031. Retrieved 5 August 2021.
5. Atencio, Daniel; Coutinho, José M.V.; Graeser, Stefan; Matioli, Paulo A.; Menezes Filho, Luiz A.D. (2004). "Lindbergite, a new Mn oxalate dihydrate from Boca Rica mine, Galiléia, Minas Gerais, Brazil, and other occurrences". American Mineralogist. 89 (7): 1087–1091. Bibcode:2004AmMin..89.1087A. doi:10.2138/am-2004-0721. ISSN 1945-3027. S2CID 100604132. Retrieved 1 December 2021.
6. Nedyalkova, Miroslava; Antonov, Vladislav (1 January 2018). "Manganese oxalates - structure-based Insights". Open Chemistry. 16 (1): 1176–1183. doi:10.1515/chem-2018-0123. ISSN 2391-5420. S2CID 104343447.
7. Puzan, Anna N.; Baumer, Vyacheslav N.; Lisovytskiy, Dmytro V.; Mateychenko, Pavel V. (1 April 2018). "Structure disordering and thermal decomposition of manganese oxalate dihydrate, MnC2O4·2H2O". Journal of Solid State Chemistry. 260: 87–94. Bibcode:2018JSSCh.260...87P. doi:10.1016/j.jssc.2018.01.022. ISSN 0022-4596. Retrieved 5 August 2021.
8. Donkova, Borjana; Avdeev, Georgi (1 August 2015). "Synthesis and decomposition mechanism of γ-MnC2O4·2H2O rods under non-isothermal and isothermal conditions". Journal of Thermal Analysis and Calorimetry. 121 (2): 567–577. doi:10.1007/s10973-015-4590-4. ISSN 1588-2926. S2CID 97032400. Retrieved 5 August 2021.
9. Ahmad, Tokeer; Ramanujachary, Kandalam V.; Lofland, Samuel E.; Ganguli, Ashok K. (24 November 2004). "Nanorods of manganese oxalate: a single source precursor to different manganese oxide nanoparticles (MnO, Mn2O3, Mn3O4)". Journal of Materials Chemistry. 14 (23): 3406–3410. doi:10.1039/B409010A. ISSN 1364-5501. Retrieved 5 August 2021.