Neodymium(III) iodide
Chemical compound
From Wikipedia, the free encyclopedia
Neodymium(III) iodide is an inorganic salt of iodine and neodymium with the formula NdI3.[3] Neodymium uses the +3 oxidation state in the compound. The anhydrous compound[2] is a green powdery[2] solid at room temperature.
| Names | |
|---|---|
| IUPAC name
Triiodoneodymium | |
| Other names
Neodymium triiodide, Neodymium iodide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.034.047 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| NdI3 | |
| Molar mass | 524.96 g/mol |
| Appearance | Green solid |
| Melting point | 684 °C (1,263 °F; 957 K) |
| Structure | |
| 9 | |
| Hazards | |
| GHS labelling: | |
   [1] | |
| Danger[2] | |
| Related compounds | |
Other anions |
Neodymium acetate, Neodymium hydride, Neodymium nickelate |
Other cations |
erbium iodide, cerium iodide, terbium iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
Heating neodymium and iodine in an inert atmosphere produces this salt:[citation needed]
- 2 Nd + 3 I2 → 2 NdI3
It can also be prepared by the reaction of neodymium(III) oxide and hydroiodic acid to make a hydrate:[4]
- Nd2O3 + 6 HI → 2 NdI3 + 3 H2O
The anhydrate can then be obtained by heating the nonahydrate with ammonium iodide:[4]
- NdI3 • 9 H2O + nNH4I → NdI3 + nNH3 + nHI + 9H2O
Physical properties
Neodymium(III) iodide forms green, water-soluble hygroscopic crystals. It has a melting point of 784°C. It forms a nonahydrate crystal NdI3.9H2O – belongs to the orthorhombic crystal system, space group Pmmn, lattice constants a = 1.16604 nm, b = 0.80103 nm, c = 0.89702 nm, Z = 4.[5]
Other compounds
NdI3 also forms some compounds with N2H4, such as NdI3·3N2H4·2H2O which is a dark green crystal, soluble in methanol and ethanol and insoluble in water, benzene and toluene, d20°C = 3.42 g/cm³.[6]
NdI3 also forms some compounds with urea, such as NdI3 5CO(NH2)2 which is a lavender color crystal.[7]
NdI3 also forms some compounds with thiourea, such as NdI3·2CS(NH2)2·9H2O which is a pale pink crystal.[8]