Praseodymium(III) oxalate

Praseodymium(III) oxalate is an inorganic compound, a salt of praseodymium metal and oxalic acid, with the chemical formula C₆O₁₂Pr₂. The compound forms light green crystals that are insoluble in water. It also forms crystalline hydrates.

Preparation

Praseodymium(III) oxalate can be prepared from the reaction of soluble praseodymium salts with oxalic acid:

$\mathrm{𝟤}𝖯𝗋\mathsf{(}𝖭{𝖮}_{\mathrm{𝟥}}{\mathsf{)}}_{\mathrm{𝟥}}\mathsf{+}\mathrm{𝟥}\mathsf{(}𝖢𝖮𝖮𝖧{\mathsf{)}}_{\mathrm{𝟤}}\stackrel{}{\to }𝖯{𝗋}_{\mathrm{𝟤}}\mathsf{(}{𝖢}_{\mathrm{𝟤}}{𝖮}_{\mathrm{𝟦}}{\mathsf{)}}_{\mathrm{𝟥}}\mathsf{\downarrow }\mathsf{+}\mathrm{𝟨}𝖧𝖭{𝖮}_{\mathrm{𝟥}}$

Properties

Praseodymium(III) oxalate forms crystalline hydrates (light green crystals): Pr₂(C₂O₄)₃•10H₂O. The crystalline hydrate decomposes stepwise when heated:

$𝖯{𝗋}_{\mathrm{𝟤}}\mathsf{(}{𝖢}_{\mathrm{𝟤}}{𝖮}_{\mathrm{𝟦}}{\mathsf{)}}_{\mathrm{𝟥}}\mathsf{\cdot }\mathrm{𝟣}\mathrm{𝟢}{𝖧}_{\mathrm{𝟤}}𝖮\underset{-H_{2}O}{\overset{T}{\to }}𝖯{𝗋}_{\mathrm{𝟤}}\mathsf{(}{𝖢}_{\mathrm{𝟤}}{𝖮}_{\mathrm{𝟦}}{\mathsf{)}}_{\mathrm{𝟥}}\stackrel{T}{\to }𝖯{𝗋}_{\mathrm{𝟤}}𝖮\mathsf{(}𝖢{𝖮}_{\mathrm{𝟥}}{\mathsf{)}}_{\mathrm{𝟤}}\stackrel{T}{\to }𝖯{𝗋}_{\mathrm{𝟤}}{𝖮}_{\mathrm{𝟤}}𝖢{𝖮}_{\mathrm{𝟥}}\stackrel{800^{o}C}{\to }𝖯{𝗋}_{\mathrm{𝟨}}{𝖮}_{\mathrm{𝟣}\mathrm{𝟣}}$

Uses

Praseodymium(III) oxalate is used as an intermediate product in the synthesis of praseodymium. It is also applied to colour some glasses and enamels. If mixed with certain other materials, the compound paints glass intense yellow.