Praseodymium(III) oxalate explained

Praseodymium(III) oxalate is an inorganic compound, a salt of praseodymium metal and oxalic acid, with the chemical formula C₆O₁₂Pr₂.^[1] 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:

2Pr(NO _{3)} _{3} +3(COOH) _{2} \xrightarrow{ Pr _{2 (C} _{2O} _{4)} _{3\downarrow} + 6 HNO _{3} }

Properties

Praseodymium(III) oxalate forms crystalline hydrates (light green crystals): Pr₂(C₂O₄)₃•10H₂O. The crystalline hydrate decomposes stepwise when heated:^{[2] [3]}

Pr _{2(C} _{2O} _{4)} _{3 ⋅} 10H _{2O} \xrightarrow[-H _{2O]{T} Pr _{2 (C} _{2O} _{4)} _{3} \xrightarrow{T} Pr _{2O(CO} _{3)} _{2} \xrightarrow{T} Pr _{2O} _{2CO} _{3} \xrightarrow{ 800 ^{oC} Pr} _{6 O} _{11} }

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.^[4]

Notes and References

1. Web site: Praseodymium oxalate . . 17 June 2021 . en.
2. Hussein . Gamal A.M. . Formation of praseodymium oxide from the thermal decomposition of hydrated praseodymium acetate and oxalate . Journal of Analytical and Applied Pyrolysis . 17 June 2021 . 89–102 . en . 10.1016/0165-2370(93)00782-I . 1994-06-01. 29 .
3. Lv . Peng . Zhang . Liangjing . Koppala . Sivasankar . Chen . Kaihua . He . Yuan . Li . Shiwei . Yin . Shaohua . Decomposition Study of Praseodymium Oxalate as a Precursor for Praseodymium Oxide in the Microwave Field . . 21338–21344 . 10.1021/acsomega.0c00505 . 2020-09-01. 5 . 34 . 32905250 . 7469113 .
4. Web site: Praseodymium Oxalate 99%-99.999% from Metall Rare Earth Limited . metall.com.cn . 17 June 2021.