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Neodymium (III) iodide

Names
IUPAC name Triiodoneodymium
Other names Neodymium triiodide, Neodymium iodide
Identifiers
CAS Number	13813-24-6
3D model (JSmol)	Interactive image
ChemSpider	75394
ECHA InfoCard	100.034.047
EC Number	237-467-7
PubChem CID	83745
CompTox Dashboard (EPA)	DTXSID0065642
InChI InChI=1S/3HI.Nd/h3*1H;/q;;;+3/p-3Key: DKSXWSAKLYQPQE-UHFFFAOYSA-K
SMILES I(I)I
Properties
Chemical formula	NdI3
Molar mass	524.96 g/mol
Appearance	Green solid
Melting point	684 °C (1,263 °F; 957 K)
Structure
Coordination geometry	9
Hazards
GHS labelling:
Pictograms
Signal word	Danger
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 , 100 kPa). Infobox references

Neodymium(III) iodide is an inorganic salt of iodine and neodymium with the formula NdI₃. Neodymium uses the +3 oxidation state in the compound. The anhydrous compound is a green powdery solid at room temperature.

Preparation

Heating neodymium and iodine in an inert atmosphere produces this salt:

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:

Nd₂O₃ + 6 HI → 2 NdI₃ + 3 H₂O

The anhydrate can then be obtained by heating the nonahydrate with ammonium iodide:

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.

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, d_20°C = 3.42 g/cm³.

NdI₃ also forms some compounds with urea, such as NdI₃ 5CO(NH₂)₂ which is a lavender color crystal.

NdI₃ also forms some compounds with thiourea, such as NdI₃·2CS(NH₂)2·9H₂O which is a pale pink crystal.

See also

• Neodymium(II) iodide
• Neodymium
• Iodine
• Lanthanide

References

1. See https://onyxmet.com/index.php?route=product/product&product_id=2733
2. ^ See https://pubchem.ncbi.nlm.nih.gov/compound/Neodymium-triiodide#datasheet=LCSS
3. Ezhov, Y.S., Komarov, S.A. & Sevast’yanov, V.G. Refinement of molecular constants of neodymium triiodide by electron diffraction. J Struct Chem 41, 593–596 (2000). https://doi.org/10.1007/BF02683920
4. ^ Kutscher, J.; Schneider, A. (1971-09-01). "Notiz zur Präparation von wasserfreien Lanthaniden-Haloge-niden, Insbesondere von Jodiden". Inorganic and Nuclear Chemistry Letters (in German). 7 (9): 815–819. doi:10.1016/0020-1650(71)80253-2. ISSN 0020-1650.
5. T. Timofte, A. Babai, G. Meyer and A.-V. Mudring (2005). "Neodymium triiodide nonahydrate". Acta Crystallographica Section E. E61 (5): i87 – i88. doi:10.1107/S160053680501216X.{{cite journal}}: CS1 maint: multiple names: authors list (link)
6. Uchenye zapiski: Serii︠a︡ khimicheskikh nauk (S.M. Kirov adyna Azărbai̐jan Dȯvlăt Universiteti; 1975), page 78. Retrieved January 13, 2021. (Translated from Vietnamese)
7. Russian Journal of Inorganic Chemistry, Episode 18, Part 2 (British Library Lending Division with the cooperation of the Royal Society of Chemistry, 1973), page 1655. Retrieved 13 January 2021.
8. Alikberova L.Yu., Albov D.V., Antonenko T.A., Kochetova I.M., Rukk N.S. — Thiourea complexes of neodymium(III) and gadolinium(III) iodides. synthesis and structure. Fine Chemical Technologies. 2010, 5 (3): 30–33. (in Russian).

• Neodymium(III) compounds
• Iodides
• Lanthanide halides