Praseodymium(III) iodide

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Praseodymium(III) iodide (PrI3) is an inorganic salt made from praseodymium and iodine. It forms green, hygroscopic crystals that dissolve in water.

Key facts
- Formula: PrI3
- Appearance: green crystals
- Solubility: highly soluble in water (about 213.9 g per 100 mL at room temperature)
- Crystal structure: orthorhombic, PuBr3 type (space group Cmcm); a = 4.328 Å, b = 14.003 Å, c = 9.988 Å
- Molar mass: 521.62 g/mol
- Density: 5.8 g/cm³
- Melting point: 738 °C
- Boiling point: 1380 °C
- Stability: hygroscopic and can decompose
- Decomposition: may proceed via an intermediate phase 2 PrI3·PrOI to form a mixture of praseodymium oxyiodide (PrOI) and praseodymium oxide (Pr2O3)

Safety
- Hazardous; handling requires appropriate precautions (may cause skin irritation and other hazards).