Praseodymium(III) sulfate

Praseodymium(III) sulfate

Praseodymium sulfate octahydrate
Names
IUPAC name praseodymium(3+); trisulfate
Other names Praseodymium sulphate, dipraseodymium trisulphate, praseodymium(III) sulfate
Identifiers
CAS Number	10277-44-8 Y 13510-41-3 (octahydrate)
3D model (Jmol)	Interactive image
ChemSpider	145346 N
ECHA InfoCard	100.030.553
EC Number	233-622-8
PubChem	165851 25022097 (octahydrate)
InChI InChI=1S/3H2O4S.2Pr/c3*1-5(2,3)4;;/h3*(H2,1,2,3,4);;/q;;;2*+3/p-6 Key: HWZAHTVZMSRSJE-UHFFFAOYSA-H InChI=1S/3H2O4S.8H2O.2Pr/c3*1-5(2,3)4;;;;;;;;;;/h3*(H2,1,2,3, 4);8*1H2;;/q;;;;;;;;;;;2*+3/p-6 (octahydrate) Key: IJXLQIGVGZNKP-UHFFFAOYSA-H (octahyrate)
SMILES [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Pr+3].[Pr+3] O.O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-]. [Pr+3].[Pr+3] (octahyrate)
Properties
Chemical formula	Pr2(SO4)3 Pr2(SO4)3·nH2O, n=2,5,8
Molar mass	570.0031 g/mol 714.12534 g/mol (octahydrate)
Appearance	green crystalline solid
Density	3.72 g/cm3[1]
Melting point	1,010 °C (1,850 °F; 1,280 K) (decomposes)[1]
Solubility in water	113.0 g/l (20 °C) 108.8 g/l (25 °C)
Hazards
Main hazards	Xi
R-phrases	36/37/38
S-phrases	26–36
Flash point	Non-flammable
Related compounds
Other anions	Praseodymium carbonate Praseodymium chloride
Other cations	Neodymium sulfate
Related compounds	Praseodymium(III) oxide Praseodymium(III) sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Praseodymium(III) sulfate is a Praseodymium compound with formula Pr₂(SO₄)₃. It is an odourless whitish-green crystalline compound. The anhydrous substance readily absorbs water forming pentahydrate and octahydrate.^[1]

Properties

Praseodymium sulfate is stable under standard conditions. At elevated temperatures, it gradually loses water and becomes more whitish. Like all rare earth sulfates, its solubility decreases with temperature, a property once used to separate it from other, non-rare earth compounds.

Pentahydrate and octahydrate have monoclinic crystal structures with densities of 3.713 and 2.813 g/cm³, respectively. The octahydrate crystals are optically biaxial, with refractive index components of n_α = 1.5399, n_β = 1.5494 and n_γ = 1.5607.^[1] They belong to the space group C12/c1 (No. 15) and have lattice constants a = 1370.0(2) pm, b = 686.1(1) pm, c = 1845.3(2) pm, β = 102.80(1)° and Z = 4.^[2]

Synthesis

Crystals of octahydrate can be grown from solution obtained by dissolving wet Pr₂O₃ powder with sulfuric acid. This procedure can be optimised by adding a few evaporation/dissolution steps involving organic chemicals.^[2]

References