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Praseodymium(III) sulfate

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Praseodymium(III) sulfate

Praseodymium sulfate octahydrate
Names
Other names Praseodymium sulphate, dipraseodymium trisulphate, praseodymium(III) sulfate
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.553 Edit this at Wikidata
EC Number
  • 233-622-8
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/3H2O4S.2Pr/c3*1-5(2,3)4;;/h3*(H2,1,2,3,4);;/q;;;2*+3/p-6Key: HWZAHTVZMSRSJE-UHFFFAOYSA-H

  • 1S/3H2O4S.8H2O.2Pr/c3*1-5(2,3)4;;;;;;;;;;/h3*(H2,1,2,3, 4);8*1H2;;/q;;;;;;;;;;;2*+3/p-6 (octahydrate)
SMILES
  • S(=O)(=O).S(=O)(=O).S(=O)(=O)..

  • O.O.O.O.O.O.O.O.S(=O)(=O).S(=O)(=O).S(=O)(=O). . (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/cm
Melting point 1010 °C (decomposes)
Solubility in water 113.0 g/L (20 °C)
108.8 g/L (25 °C)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards Xi
Flash point Non-flammable
Related compounds
Other anions Praseodymium carbonate
Praseodymium chloride
Other cations Neodymium sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

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

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/cm, respectively. The octahydrate crystals are optically biaxial, with refractive index components of nα = 1.5399, nβ = 1.5494 and nγ = 1.5607. They belong to the space group C12/c1 (No. 15) and have lattice constants a = 13.700(2) Å, b = 6.861(1) Å, c = 18.453(2) Å, β = 102.80(1)° and Z = 4.

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.


References

  1. ^ National Research Council (U.S.) (1919). Bulletin of the National Research Council. National Academies. pp. 3–. NAP:12020. Retrieved 14 November 2011.
  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. PDF copy
Praseodymium compounds
Pr(II)
Pr(III)
Organopraseodymium(III) compounds
  • Pr2(CO3)3
  • Pr2(C2O4)3
    • Pr(III,IV)
    Pr(IV)
    Pr(V)
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