Praseodymium(III) iodide

Praseodymium(III) iodide

Names
Other names Praseodymium triiodide
Identifiers
CAS Number	13813-23-5
3D model (JSmol)	Interactive image
ChemSpider	75566
ECHA InfoCard	100.034.046
EC Number	237-466-1
PubChem CID	83744
CompTox Dashboard (EPA)	DTXSID5065641
InChI InChI=1S/3HI.Pr/h3*1H;/q;;;+3/p-3 Key: PVEVRIVGNKNWML-UHFFFAOYSA-K
SMILES I[Pr](I)I
Properties
Chemical formula	PrI3
Molar mass	521,619 g/mol 683,75652 g/mol (9 nước)
Appearance	hygroscopic green crystals
Density	5,8 g/cm³
Melting point	738 °C (1,360 °F; 1,011 K)
Boiling point	1,380 °C (2,520 °F; 1,650 K)
Solubility in water	213,9 g/100 mL
Solubility	tạo phức với hydrazin, urê, thiourê
Related compounds
Other anions	Praseodymium(III) fluoride Praseodymium(III) chloride Praseodymium(III) bromide
Other cations	Cerium(III) iodide Neodymium(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Praseodymium(III) iodide is an inorganic salt, consisting of praseodymium and hydroiodic acid with the chemical formula PrI₃, with green crystals. It is soluble in water.

Preparation

• Heating praseodymium and iodine in an inert atmosphere produces praseodymium(III) iodide:

${\mathsf {2Pr+3I_{2}\ \xrightarrow {T} \ 2PrI_{3}}}$

• Heat praseodymium with mercury(II) iodide:

${\mathsf {2Pr+3HgI_{2}\ \xrightarrow {T} \ 2PrI_{3}+3Hg}}$

Physical properties

Praseodymium(III) iodide forms green crystals, which are soluble in water.

Praseodymium(III) iodide belongs to the orthorhombic crystal system.

Other compounds

PrI₃ forms compounds with N₂H₄, like PrI₃·3N₂H₄·4H₂O which is a pale yellow crystals and soluble in metanol, slightly soluble in water, and insoluble in benzen, d_{20 ℃} = 2,986 g/cm³.

PrI₃ forms compounds with CO(NH₂)₂, like PrI₃·5CO(NH₂)₂ which is a pale green crystal.

PrI₃ forms compounds with CS(NH<sub id="mwQQ">2</sub>)<sub id="mwQg">2</sub>, like PrI₃·2CS(NH₂)₂·9H₂O which is a green crystal with d = 2,27 g/cm³.