Neodymium(III) iodide

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.

Neodymium (III) iodide
Names
IUPAC name
Triiodoneodymium
Other names
Neodymium triiodide, Neodymium iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.047
EC Number
  • 237-467-7
  • InChI=1S/3HI.Nd/h3*1H;/q;;;+3/p-3
    Key: DKSXWSAKLYQPQE-UHFFFAOYSA-K
  • I[Nd](I)I
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:
GHS07: Exclamation markGHS08: Health hazardGHS09: Environmental hazard[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).
Infobox references

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:[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
Crystal structure of Neodymium iodide Nd3+ 0 I−

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]

See also

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).
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