Samarium(III) oxalate

Samarium(III) oxalate
Names
	Other names Tris(oxalato)disamarium, Samarium oxalate,
Identifiers
CAS Number	3252-68-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	144736;
EC Number	221-844-8;
PubChem CID	165093;
CompTox Dashboard (EPA)	DTXSID50920648 ;
	InChI InChI=1S/3C2H2O4.2Sm/c33-1(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

Samarium(III) oxalate is an inorganic compound, a salt of samarium and oxalic acid with the formula Sm₂(C₂O₄)₃.[1] The compound does not dissolve in water, forms a crystalline hydrate with yellow crystals.[2]

Synthesis

Precipitation of soluble samarium salts with oxalic acid:[3]

{\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:[4]

{\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.[5]

References

Bulletin of the Research Council of Israel: Chemistry. Section A. Weizmann Science Press of Israel. 1959. p. 174. Retrieved 8 August 2021.
"Samarium(III) oxalate hydrate ≥99.99% | Sigma-Aldrich". Sigma Aldrich. Retrieved 8 August 2021.
Sanuki, Sumiko; Sugiyama, Akio; Tunekawa, Minoru; Kadomachi, Kiyotaka; Arai, Koichi (1994). "Precipitation Stripping of Samarium Oxalate from Organic Solution Containing Acid Type Extractant by Oxalic Acid". Journal of the Japan Institute of Metals. 58 (11): 1271–1278. doi:10.2320/jinstmet1952.58.11_1271. Retrieved 8 August 2021.
Wendlandt, W. W. (1 March 1959). "Thermal Decomposition of Rare Earth Metal Oxalates". Analytical Chemistry. 31 (3): 408–410. doi:10.1021/ac60147a024. ISSN 0003-2700. Retrieved 8 August 2021.
Hussein, G.A.M.; Buttrey, D.J.; Desanto, P.; Abd-Elgaber, A.A.; Roshdy, Heba; Myhoub, Ali Y.Z. (3 June 2003). "Formation and characterization of samarium oxide generated from different precursors". Thermochimica Acta. 402 (1–2): 27–36. doi:10.1016/S0040-6031(02)00535-X. ISSN 0040-6031. Retrieved 8 August 2021.

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[1] Bulletin of the Research Council of Israel: Chemistry. Section A. Weizmann Science Press of Israel. 1959. p. 174. Retrieved 8 August 2021.

[2] "Samarium(III) oxalate hydrate ≥99.99% | Sigma-Aldrich". Sigma Aldrich. Retrieved 8 August 2021.

[3] Sanuki, Sumiko; Sugiyama, Akio; Tunekawa, Minoru; Kadomachi, Kiyotaka; Arai, Koichi (1994). "Precipitation Stripping of Samarium Oxalate from Organic Solution Containing Acid Type Extractant by Oxalic Acid". Journal of the Japan Institute of Metals. 58 (11): 1271–1278. doi:10.2320/jinstmet1952.58.11_1271. Retrieved 8 August 2021.

[4] Wendlandt, W. W. (1 March 1959). "Thermal Decomposition of Rare Earth Metal Oxalates". Analytical Chemistry. 31 (3): 408–410. doi:10.1021/ac60147a024. ISSN 0003-2700. Retrieved 8 August 2021.

[5] Hussein, G.A.M.; Buttrey, D.J.; Desanto, P.; Abd-Elgaber, A.A.; Roshdy, Heba; Myhoub, Ali Y.Z. (3 June 2003). "Formation and characterization of samarium oxide generated from different precursors". Thermochimica Acta. 402 (1–2): 27–36. doi:10.1016/S0040-6031(02)00535-X. ISSN 0040-6031. Retrieved 8 August 2021.