Praseodymium(III) carbonate

Praseodymium(III) carbonate is an inorganic compound, with a chemical formula of Pr₂(CO₃)₃. The anhydrous form is olive green, and many of its hydrates such as heptahydrate and octahydrate are known.^[3] They are all insoluble in water.^[2]

Praseodymium(III) carbonate

Names
IUPAC name Praseodymium(III) carbonate
Identifiers
CAS Number	anhydrous: 5895-45-4 Y octahydrate: 14948-62-0 Y
3D model (JSmol)	anhydrous: Interactive image octahydrate: Interactive image
ChemSpider	anhydrous: 144967 N octahydrate: 21241398
EC Number	anhydrous: 227-578-9
PubChem CID	anhydrous: 165369 octahydrate: 25022096
CompTox Dashboard (EPA)	anhydrous: DTXSID00648481
InChI anhydrous: InChI=1S/3CH2O3.2Pr/c3*2-1(3)4;;/h3*(H2,2,3,4);;/q;;;2*+3/p-6 Key: XIRHLBQGEYXJKG-UHFFFAOYSA-H octahydrate: InChI=1S/3CH2O3.8H2O.2Pr/c3*2-1(3)4;;;;;;;;;;/h3*(H2,2,3,4);8*1H2;;/q;;;;;;;;;;;2*+3/p-6 Key: SEHQEMTYQGRHIC-UHFFFAOYSA-H
SMILES anhydrous: C(=O)([O-])[O-].C(=O)([O-])[O-].C(=O)([O-])[O-].[Pr+3].[Pr+3] octahydrate: C(=O)([O-])[O-].C(=O)([O-])[O-].C(=O)([O-])[O-].O.O.O.O.O.O.O.O.[Pr+3].[Pr+3]
Properties
Chemical formula	Pr2(CO3)3
Molar mass	461.849 (anhydrous) 605.977 (octahydrate)
Appearance	green crystals (octahydrate) [1]
Solubility in water	insoluble (1.99×10−6mol/L) [2]
Related compounds
Other anions	Praseodymium(III) chloroacetate Praseodymium(III) sulfate Praseodymium(III) nitrate
Other cations	cerium carbonate neodymium carbonate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Praseodymium(III) carbonate can be obtained by the hydrolysis of praseodymium(III) chloroacetate:^[2][4]

2 Pr(C₂Cl₃O₂)₃ + 3 H₂O → Pr₂(CO₃)₃ + 6 CHCl₃ + 3 CO₂

It can also be obtained by reacting sodium bicarbonate saturated with carbon dioxide with a praseodymium chloride solution.^[4]

Chemical properties

Praseodymium(III) carbonate is soluble in acids, and emits carbon dioxide:^[5]

Pr₂(CO₃)₃ + 6 H⁺ → 2 Pr³⁺ + 3 H₂O + 3 CO₂↑

However, it is insoluble in water.^[2]

Other compounds

Praseodymium(III) carbonate forms compounds with N₂H₄, such as Pr₂(CO₃)₃•12N₂H₄•5H₂O which is a pale green crystal that is slightly soluble in water but insoluble in benzene, with d20°C = 1.873 g/cm³.^[6]