Promethium(III) oxalate

Promethium(III) oxalate is an oxalate of promethium, with the chemical formula Pm₂(C₂O₄)₃. Its decahydrate crystallizes in the monoclinic crystal system with space group P2₁/m.^[1] Promethium(III) oxalate trihydrate can decompose into stable basic carbonate Pm₂O₂CO₃,^[2] and generate promethium(III) oxide at higher temperatures.^[3]

Promethium(III) oxalate

Identifiers
CAS Number	10561-77-0 anhydrous Y trihydrate: 25880-55-1 Y decahydrate: 14462-37-4 Y
3D model (JSmol)	Interactive image trihydrate: Interactive image decahydrate: Interactive image
InChI InChI=1S/3C2H2O4.2Pm/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 Key: UVHJLJNPJSACAD-UHFFFAOYSA-H
SMILES C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Pm+3].[Pm+3] trihydrate: C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Pm+3].[Pm+3].O.O.O decahydrate: C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Pm+3].[Pm+3].O.O.O.O.O.O.O.O.O.O
Properties
Chemical formula	Pm2(C2O4)3
Molar mass	559.93
Related compounds
Other cations	Cerium(III) oxalate Europium(III) oxalate Gadolinium(III) oxalate Holmium(III) oxalate Lanthanum(III) oxalate Neodymium(III) oxalate Praseodymium(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

In all lanthanide oxalates, promethium(III) oxalate has the lowest solubility.^[4]