Praseodymium(III) phosphate

Praseodymium(III) phosphate is an inorganic compound with the chemical formula PrPO₄.

Praseodymium(III) phosphate

Identifiers
CAS Number	14298-31-8 Y
3D model (JSmol)	Interactive image
ChemSpider	2341292
ECHA InfoCard	100.034.740
EC Number	238-231-6
PubChem CID	3084189
CompTox Dashboard (EPA)	DTXSID90162267
InChI InChI=1S/H3O4P.Pr/c1-5(2,3)4;/h(H3,1,2,3,4);/q;+3/p-3 Key: KDCUNMWWJBHRSC-UHFFFAOYSA-K
SMILES [O-]P(=O)([O-])[O-].[Pr+3]
Properties
Chemical formula	O4PPr
Molar mass	235.877 g·mol−1
Appearance	solid
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
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) phosphate hemihydrate can be obtained by reacting praseodymium chloride and phosphoric acid:^[2]

PrCl₃ + H₃PO₄ → PrPO₄ + 3 HCl

It can also be produced by reacting silicon pyrophosphate (SiP₂O₇) and praseodymium(III,IV) oxide (Pr₆O₁₁) at 1200 °C.^[3]

Properties

Praseodymium(III) phosphate forms light green crystals in the monoclinic crystal system, with space group P2₁/n and cell parameters a = 0.676 nm, b = 0.695 nm, c = 0.641 nm, β = 103.25°, Z = 4.^[4][5]

It forms a crystal hydrate of the composition PrPO₄·nH₂O, where n < 0.5, with light green crystals of hexagonal crystal system, space group P6₂22, and cell parameters a = 0.700 nm, c = 0.643 nm, Z = 3.^[6][7]

Praseodymium(III) phosphate reacts with sodium fluoride to obtain Na₂PrF₂(PO₄).^[8]

PrPO₄ + 2 NaF → Na₂PrF₂(PO₄)