Praseodymium(III) oxalate

Praseodymium(III) oxalate is an inorganic compound, a salt of praseodymium metal and oxalic acid, with the chemical formula Pr(C₂O₄)₃.^[1] The compound forms light green crystals that are insoluble in water. It also forms crystalline hydrates.

Praseodymium(III) oxalate

Names
Other names Praseodymium oxalate, Tris(oxalato(2-))dipraseodymium
Identifiers
CAS Number	3269-10-1 Y
3D model (JSmol)	Interactive image
ChemSpider	144738
ECHA InfoCard	100.019.895
EC Number	221-884-6
PubChem CID	165096
CompTox Dashboard (EPA)	DTXSID20954374
InChI InChI=1S/3C2H2O4.2Pr/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 Key: UHTYDNCIXKPJDA-UHFFFAOYSA-H
SMILES C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Pr+3].[Pr+3]
Properties
Chemical formula	Pr2(C2O4)3
Molar mass	545.87
Appearance	Light green crystals
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
Other cations	Cerium(III) oxalate Europium(III) oxalate Gadolinium(III) oxalate Holmium(III) oxalate Lanthanum(III) oxalate Neodymium(III) oxalate Promethium(III) oxalate Samarium(III) oxalate Terbium(III) oxalate Thulium(III) oxalate Ytterbium(III) oxalate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Praseodymium(III) oxalate precipitates out during the reaction of soluble praseodymium salts with oxalic acid:^{[citation needed]}

2 Pr(NO₃)₃ + 3(COOH)₂ → Pr₂(C₂O₄)₃ + 6 HNO₃

Properties

Praseodymium(III) oxalate forms crystalline hydrates (light green crystals): Pr₂(C₂O₄)₃·(₈H₂O + 2.21H₂O). The crystalline hydrate decomposes stepwise when heated to 800 °C (1,470 °F):^[2][3]

Pr₂(C₂O₄)₃·8H₂O → Pr₂(C₂O₄)₃ + 10.21 H₂O @ (49.5 °C (121.1 °F))

Pr₂(C₂O₄)₃ → Pr₂CO₅ + 2 CO₂ + 3 CO @ (440.4 °C (824.7 °F))

Pr₂CO₅ → Pr₂O₂CO₃ → Pr₆O₁₁ + 2 CO₂ @ (650–800 °C (1,202–1,472 °F))

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 fused with certain other materials, the compound colors glass an intense yellow.^[4]