Samarium(III) oxalate

{{Chembox

| ImageFile =

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| OtherNames = Tris(oxalato)disamarium, Samarium oxalate,

|Section1={{Chembox Identifiers

| CASNo = 3252-68-4

| CASNo_Ref = {{cascite|correct|CAS}}

| ChemSpiderID = 144736

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| UNII_Ref = {{fdacite|changed|FDA}}

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| EINECS = 221-844-8

| PubChem = 165093

| StdInChI= 1S/3C2H2O4.2Sm/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6

| StdInChIKey = 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]

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|Section2={{Chembox Properties

| Sm=2|C=6|O=12

| Appearance = Yellow crystals

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| Solubility = Insoluble

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|Section3={{Chembox Hazards

| MainHazards =

| GHSPictograms = {{GHS07}}

| GHSSignalWord = Warning

| HPhrases = {{H-phrases|302|312}}

| PPhrases = {{P-phrases|264|270|280|301+312|302+352|312|322|330|363|501}}

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|Section6={{Chembox Related

| OtherCompounds = Praseodymium oxalate

}}

Samarium(III) oxalate is an inorganic compound, a salt of samarium and oxalic acid with the formula Sm₂(C₂O₄)₃.{{cite book |title=Bulletin of the Research Council of Israel: Chemistry. Section A |date=1959 |publisher=Weizmann Science Press of Israel |page=174 |url=https://books.google.com/books?id=OAI5AAAAIAAJ&q=samarium+oxalate |access-date=8 August 2021 |language=en}} The compound does not dissolve in water, forms a crystalline hydrate with yellow crystals.{{cite web |title=Samarium(III) oxalate hydrate ≥99.99% {{!}} Sigma-Aldrich |url=https://www.sigmaaldrich.com/RU/ru/product/aldrich/463825 |publisher=Sigma Aldrich |access-date=8 August 2021 |language=en}}

Synthesis

Precipitation of soluble samarium salts with oxalic acid:{{cite journal |last1=Sanuki |first1=Sumiko |last2=Sugiyama |first2=Akio |last3=Tunekawa |first3=Minoru |last4=Kadomachi |first4=Kiyotaka |last5=Arai |first5=Koichi |title=Precipitation Stripping of Samarium Oxalate from Organic Solution Containing Acid Type Extractant by Oxalic Acid |journal=Journal of the Japan Institute of Metals |date=1994 |volume=58 |issue=11 |pages=1271–1278 |doi=10.2320/jinstmet1952.58.11_1271 |url=https://www.jstage.jst.go.jp/article/jinstmet1952/58/11/58_11_1271/_article |access-date=8 August 2021|doi-access=free }}

:: $\mathsf{ 2SmCl_3 + 3H_2C_2O_4 \ \xrightarrow{}\ Sm_2(C_2O_4)_3\downarrow + 6HCl }$

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

:: $\mathsf{ 2Sm(NO_3)_3 + 3H_2C_2O_4 \ \xrightarrow{}\ Sm_2(C_2O_4)_3\downarrow + 6HNO_3 }$

Physical properties

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

Chemical properties

Decomposes on heating:{{cite journal |last1=Wendlandt |first1=W. W. |title=Thermal Decomposition of Rare Earth Metal Oxalates |journal=Analytical Chemistry |date=1 March 1959 |volume=31 |issue=3 |pages=408–410 |doi=10.1021/ac60147a024 |url=https://pubs.acs.org/doi/abs/10.1021/ac60147a024 |access-date=8 August 2021 |issn=0003-2700|url-access=subscription }}

:: $\mathsf{ Sm_2(C_2O_4)_3 \ \xrightarrow{800^oC}\ Sm_2O_3 + 3CO_2 + 3CO }$

Crystalline hydrate Sm₂(C₂O₄)₃ • 10H₂O decomposes stepwise.{{cite journal |title=Formation and characterization of samarium oxide generated from different precursors |journal=Thermochimica Acta |date=3 June 2003 |volume=402 |issue=1–2 |pages=27–36 |doi=10.1016/S0040-6031(02)00535-X |url=https://www.sciencedirect.com/science/article/abs/pii/S004060310200535X |access-date=8 August 2021 |language=en |issn=0040-6031|last1=Hussein |first1=G.A.M. |last2=Buttrey |first2=D.J. |last3=Desanto |first3=P. |last4=Abd-Elgaber |first4=A.A. |last5=Roshdy |first5=Heba |last6=Myhoub |first6=Ali Y.Z. |url-access=subscription }}

References

Category:Oxalates

Category:Samarium(III) compounds