Manganese oxalate

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

Manganese oxalate is an inorganic compound with the chemical formula MnC₂O₄. ^{[2] [3]} Solid samples are pale pink and insoluble in water. At least two hydrates have been observed. ^[4] It occurs naturally as the mineral Lindbergite. ^[5]

Synthesis

Exchange reaction between sodium oxalate and manganese chloride:

MnCl₂ + Na₂C₂O₄ + 2 H₂O → MnC₂O₄·2H₂O + 2 NaCl

The dihydrate can also be prepared hydrothermally. ^[6]

Physical properties

Portion of crystal structure of manganese(II) oxalate dihydrate. Color code: red = O, blue = Mn.

Manganese oxalate forms light pink crystals. The crystalline hydrates have the composition MnC₂O₄•n H₂O, where n = 2 and 3. ^[7] The dihydrate 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. ^{[8] [9]}

It does not dissolve in water, pK_sp = 6.8.

Chemical properties

Manganese oxalate is a precursor various manganese oxides, such as MnO, Mn
_²O
_³, and Mn
_³O
_⁴. it decomposes at 215 °C: ^[10]

MnC₂O₄ → MnO + CO₂ + CO

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. Bibcode:2004TcAc..421..141D. 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. Lethbridge, Zoe A.D.; Congreve, Aileen F.; Esslemont, Emma; Slawin, Alexandra M.Z.; Lightfoot, Philip (2003). "Synthesis and structure of three manganese oxalates: MnC2O4·2H2O, [C4H8(NH2)2][Mn2(C2O4)3] and Mn2(C2O4)(OH)2". Journal of Solid State Chemistry. 172: 212–218. doi:10.1016/S0022-4596(03)00035-5.
7. 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.
8. 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.
9. 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.
10. 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.