Manganese oxalate

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

Synthesis
Exchange reaction between sodium oxalate and manganese chloride:
 * $$\mathsf{ MnCl_2 + Na_2C_2O_4 + 2H_2O \ \xrightarrow{}\ MnC_2O_4\cdot 2H_2O\downarrow + 2NaCl }$$

Physical properties
Manganese oxalate forms light pink crystals.

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

Forms crystalline hydrates of the composition MnC$2$O$4$•n H$2$O, where n = 2 and 3.

Crystalline hydrate of the composition MnC$2$O$4$•2H$2$O 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.

Chemical properties
Decomposes on heating:
 * $$\mathsf{ MnC_2O_4 \ \xrightarrow{215^oC}\ MnO + CO\uparrow + CO_2\uparrow }$$

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,, and.