Thulium(III) oxalate

{{Chembox

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| ImageFile = Thulium oxalate.png

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| Section1 = {{Chembox Identifiers

| CASNo = 3269-17-8

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

| ChemSpiderID = 144741

| EC_number = 221-887-2

| PubChem = 165099

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

| StdInChIKey = BSCZSHAJTJRUPP-UHFFFAOYSA-H

| SMILES = [Tm+3].[Tm+3].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-].[O-]C(=O)C(=O)[O-] }}

| Section2 = {{Chembox Properties

| Formula = Tm₂(C₂O₄)₃

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| Appearance = solid

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| Section3 = {{Chembox Hazards

| GHS_ref={{cite web |title=Thulium(3+) oxalate |url=https://pubchem.ncbi.nlm.nih.gov/compound/165099#section=Safety-and-Hazards |website=pubchem.ncbi.nlm.nih.gov |access-date=29 February 2024 |language=en}}

| GHSPictograms = {{GHS07}}

| GHSSignalWord = Warning

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

| PPhrases = {{P-phrases|264|270|280|301+317|302+352|317|321|330|362+364|501}}

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Thulium(III) oxalate is the oxalate of thulium with the chemical formula Tm₂(C₂O₄)₃. Its hydrate can be prepared by reacting an aqueous solution of thulium(III) chloride and a benzene solution of dimethyl oxalate.{{cite journal|journal=Journal of Inorganic and Nuclear Chemistry|volume=33|issue=10|language=en|date=Oct 1971|pages=3604–3608|doi=10.1016/0022-1902(71)80691-7|url=https://linkinghub.elsevier.com/retrieve/pii/0022190271806917|title=Hydrated oxalates of the yttrium group rare earth elements and scandium|accessdate=2020-10-11|author=Mamoru Watanabe, Kozo Nagashima|archive-date=2020-10-15|archive-url=https://web.archive.org/web/20201015044408/https://linkinghub.elsevier.com/retrieve/pii/0022190271806917}} Its pentahydrate is decomposed by heat to obtain the dihydrate, which is further heated to obtain thulium(III) oxide.{{cite journal|last1=Wendlandt|first1=W. W.|title=Thermal Decomposition of Rare Earth Metal Oxalates|journal=Analytical Chemistry|volume=31|issue=3|year=1959|pages=408–410|issn=0003-2700|doi=10.1021/ac60147a024}} It reacts with hydrochloric acid to obtain H[Tm(C₂O₄)₂]·6H₂O.Moebius, R.; Matthes, F. The exchange of oxalate ions for chloride ions of the oxalate hydrates of the rare earths and yttrium. Zeitschrift fuer Chemie, 1964. 4 (6): 234-235. ISSN: 0044-2402.