View source for Praseodymium(III) oxalate

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| ImageFile =
| ImageSize =
| ImageAlt =
| PIN =
| OtherNames = Praseodymium oxalate, Tris(oxalato(2-))dipraseodymium
|Section1={{Chembox Identifiers
| CASNo = 3269-10-1
| CASNo_Ref = {{cascite|correct|CAS}}
| ChemSpiderID = 144738
| UNII_Ref = {{fdacite|changed|FDA}}
| UNII =
|  EINECS = 221-884-6
|  PubChem = 165096
|  SMILES = C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Pr+3].[Pr+3]
|  StdInChI = 1S/3C2H2O4.2Pr/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6
|  StdInChIKey = UHTYDNCIXKPJDA-UHFFFAOYSA-H
 }}
|Section2={{Chembox Properties
| Formula =  {{chem|C|6|O|12|Pr|2}}
| MolarMass = 545.87
| Appearance = Light green crystals
| Density =
| MeltingPtC =
| BoilingPtC =
| Solubility = }}
|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}}
| FlashPtC =
| AutoignitionPt = }}
|Section6={{Chembox Related
| OtherCations = [[Barium oxalate]]
}}
}}

'''Praseodymium(III) oxalate''' is an [[inorganic compound]], a salt of [[praseodymium]] metal and [[oxalic acid]], with the chemical formula C<sub>6</sub>O<sub>12</sub>Pr<sub>2</sub>.<ref>{{cite web |title=Praseodymium oxalate |url=https://webbook.nist.gov/cgi/inchi?ID=B6000077&Mask=80 |publisher=[[National Institute of Standards and Technology]] |access-date=17 June 2021 |language=en}}</ref> The compound forms light green crystals that are insoluble in water. It also forms crystalline hydrates.

== Preparation ==
Praseodymium(III) oxalate can be prepared from the reaction of soluble praseodymium salts with [[oxalic acid]]:
::<math>\mathsf{2Pr(NO_3)_3 + 3(COOH)_2 \ \xrightarrow{}\ Pr_2(C_2O_4)_3\downarrow + 6HNO_3 }</math>

==Properties==

Praseodymium(III) oxalate forms crystalline hydrates (light green crystals): Pr<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>•10H<sub>2</sub>O. The crystalline hydrate decomposes stepwise when heated:<ref>{{cite journal |last1=Hussein |first1=Gamal A.M. |title=Formation of praseodymium oxide from the thermal decomposition of hydrated praseodymium acetate and oxalate |url=https://www.sciencedirect.com/science/article/abs/pii/016523709300782I |journal=Journal of Analytical and Applied Pyrolysis |access-date=17 June 2021 |pages=89–102 |language=en |doi=10.1016/0165-2370(93)00782-I |date=1994-06-01|volume=29 }}</ref><ref>{{cite journal |last1=Lv |first1=Peng |last2=Zhang |first2=Liangjing |last3=Koppala |first3=Sivasankar |last4=Chen |first4=Kaihua |last5=He |first5=Yuan |last6=Li |first6=Shiwei |last7=Yin |first7=Shaohua |title=Decomposition Study of Praseodymium Oxalate as a Precursor for Praseodymium Oxide in the Microwave Field |journal=[[ACS Omega]] |pages=21338–21344 |doi=10.1021/acsomega.0c00505 |date=2020-09-01|volume=5 |issue=34 |pmid=32905250 |pmc=7469113 }}</ref>
::<math>\mathsf{Pr_2(C_2O_4)_3\cdot 10H_2O \ \xrightarrow[-H_2O]{T}\ Pr_2(C_2O_4)_3 \ \xrightarrow{T}\ Pr_2O(CO_3)_2 \ \xrightarrow{T}\ Pr_2O_2CO_3 \ \xrightarrow{800^oC}\ Pr_6O_{11} }</math>

==Uses==
Praseodymium(III) oxalate is used as an intermediate product in the synthesis of praseodymium. It is also applied to colour some glasses and enamels. If mixed with certain other materials, the compound paints glass intense yellow.<ref>{{cite web |title=Praseodymium Oxalate 99%-99.999% from Metall Rare Earth Limited |url=http://www.metall.com.cn/prox.htm |publisher=metall.com.cn |access-date=17 June 2021}}</ref>

==References==
{{Reflist}}

{{Praseodymium compounds}}
{{Oxalates}}

[[Category:Inorganic compounds]]
[[Category:Praseodymium(III) compounds]]
[[Category:Oxalates]]