Samarium(III) oxalate

Samarium(III) oxalate is an inorganic compound, a salt of samarium and oxalic acid with the formula Sm₂(C₂O₄)₃. The compound does not dissolve in water, forms a crystalline hydrate with yellow crystals.

Samarium(III) oxalate

Names
Other names Tris(oxalato)disamarium, Samarium oxalate,
Identifiers
CAS Number	3252-68-4 Y
3D model (JSmol)	Interactive image
ChemSpider	144736
EC Number	221-844-8
PubChem CID	165093
CompTox Dashboard (EPA)	DTXSID50920648
InChI InChI=1S/3C2H2O4.2Sm/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 Key: DABIZUXUJGHLMW-UHFFFAOYSA-H
SMILES C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Sm+3].[Sm+3]
Properties
Chemical formula	C6O12Sm2
Molar mass	564.77 g·mol−1
Appearance	Yellow crystals
Solubility in water	Insoluble
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
Related compounds	Praseodymium oxalate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Precipitation of soluble samarium salts with oxalic acid:

${\mathsf {2SmCl_{3}+3H_{2}C_{2}O_{4}\ {\xrightarrow {}}\ Sm_{2}(C_{2}O_{4})_{3}\downarrow +6HCl}}$

Also a reaction of samarium nitrate and oxalic acid in an aqueous solution:

${\mathsf {2Sm(NO_{3})_{3}+3H_{2}C_{2}O_{4}\ \xrightarrow {} \ Sm_{2}(C_{2}O_{4})_{3}\downarrow +6HNO_{3}}}$

Physical properties

Samarium(III) oxalate forms a crystalline hydrate of the composition Sm₂(C₂O₄)₃ • 10H₂O with yellow crystals.

Chemical properties

Decomposes on heating:

${\mathsf {Sm_{2}(C_{2}O_{4})_{3}\ {\xrightarrow {800^{o}C}}\ Sm_{2}O_{3}+3CO_{2}+3CO}}$

Crystalline hydrate Sm₂(C₂O₄)₃ • 10H₂O decomposes stepwise.