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 ; 13510-41-3 (octahydrate);
3D model (JSmol)	Interactive image;
ChemSpider	145346 ;
ECHA InfoCard	100.030.553
EC Number	233-622-8;
PubChem CID	165851; ; 25022097 (octahydrate);
CompTox Dashboard (EPA)	DTXSID70890652 ;
	InChI InChI=1S/3H2O4S.2Pr/c31-5(2,3)4;;/h3(H2,1,2,3,4);;/q;;;2+3/p-6 Key: HWZAHTVZMSRSJE-UHFFFAOYSA-H; InChI=1S/3H2O4S.8H2O.2Pr/c31-5(2,3)4;;;;;;;;;;/h3(H2,1,2,3, 4);81H2;;/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)
Magnetic susceptibility (χ)	+9660·10−6 cm3/mol
Hazards
Main hazards	Xi
R-phrases (outdated)	36/37/38
S-phrases (outdated)	26–36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).
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	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

National Research Council (U.S.) (1919). Bulletin of the National Research Council. National Academies. pp. 3–. NAP:12020. Retrieved 14 November 2011.
Y.-Q. Zheng, Y.-J. Zhu and J.-L. Lin (2002). "Redeterminaton of the crystal structure of praseodymium sulfate octahydrate, Pr₂(SO₄)₃·8H₂O". Zeitschrift für Kristallographie – New Crystal Structures. 217: 299–300. doi:10.1524/ncrs.2002.217.jg.299. S2CID 201278521. PDF copy

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[b1-1] National Research Council (U.S.) (1919). Bulletin of the National Research Council. National Academies. pp. 3–. NAP:12020. Retrieved 14 November 2011.

[j1-2] Y.-Q. Zheng, Y.-J. Zhu and J.-L. Lin (2002). "Redeterminaton of the crystal structure of praseodymium sulfate octahydrate, Pr₂(SO₄)₃·8H₂O". Zeitschrift für Kristallographie – New Crystal Structures. 217: 299–300. doi:10.1524/ncrs.2002.217.jg.299. S2CID 201278521. PDF copy