Praseodymium(III) sulfate

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Praseodymium(III) sulfate
Praseodymium sulphate octahydrate crystals.JPG
Praseodymium sulfate octahydrate
Names
IUPAC name
praseodymium(3+); trisulfate
Other names
Praseodymium sulphate, dipraseodymium trisulphate, praseodymium(III) sulfate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.553
EC Number 233-622-8
  • 165851

  • 25022097 (octahydrate)
Properties
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]
113.0 g/l (20 °C)
108.8 g/l (25 °C)
+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R-phrases (outdated) 36/37/38
S-phrases (outdated) 26–36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).
N verify (what is YesYN ?)
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[edit]

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 nα = 1.5399, nβ = 1.5494 and nγ = 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[edit]

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[edit]

  1. ^ a b c d National Research Council (U.S.) (1919). Bulletin of the National Research Council. National Academies. pp. 3–. NAP:12020. Retrieved 14 November 2011. 
  2. ^ a b 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
Salts and esters of the sulfate ion
H2SO4 He
Li2SO4 BeSO4 B esters
ROSO3
(RO)2SO2
(NH4)2SO4
N2H6SO4
(NH3OH)2SO4
O F Ne
Na2SO4
NaHSO4
MgSO4 Al2(SO4)3
Al2SO4(OAc)4
Si P SO42− Cl Ar
K2SO4
KHSO4
CaSO4 Sc2(SO4)3 Ti(SO4)2
TiOSO4
VSO4
V2(SO4)3
VOSO4
CrSO4
Cr2(SO4)3
MnSO4
Mn2(SO4)3
FeSO4
Fe2(SO4)3
CoSO4
Co2(SO4)3
NiSO4 CuSO4
Cu2SO4
ZnSO4 Ga2(SO4)3 Ge As Se Br Kr
RbHSO4
Rb2SO4
SrSO4 Y2(SO4)3 Zr(SO4)2 Nb Mo Tc Ru Rh PdSO4 Ag2SO4 CdSO4 In2(SO4)3 SnSO4 Sb2(SO4)3 Te I Xe
Cs2SO4 BaSO4   Hf Ta W Re Os Ir Pt Au Hg2SO4
HgSO4
Tl2SO4
Tl2(SO4)3
PbSO4 Bi2(SO4)3 Po At Rn
Fr Ra   Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
La Ce2(SO4)3
Ce(SO4)2
Pr2(SO4)3 Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb2(SO4)3 Lu
Ac Th Pa U(SO4)2
UO2SO4
Np Pu Am Cm Bk Cf Es Fm Md No Lr