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Neodymium(III) iodide
Chemical compound

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.

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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:5

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 = 4.6

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/cm³.7

NdI3 also forms some compounds with urea, such as NdI3 5CO(NH2)2 which is a lavender color crystal.8

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

See also

References

  1. 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 https://doi.org/10.1007/BF02683920 ↩

  2. See https://pubchem.ncbi.nlm.nih.gov/compound/Neodymium-triiodide#datasheet=LCSS https://pubchem.ncbi.nlm.nih.gov/compound/Neodymium-triiodide#datasheet=LCSS ↩

  3. See https://pubchem.ncbi.nlm.nih.gov/compound/Neodymium-triiodide#datasheet=LCSS https://pubchem.ncbi.nlm.nih.gov/compound/Neodymium-triiodide#datasheet=LCSS ↩

  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. https://dx.doi.org/10.1016/0020-1650%2871%2980253-2 ↩

  5. 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. https://dx.doi.org/10.1016/0020-1650%2871%2980253-2 ↩

  6. 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) /wiki/Doi_(identifier) ↩

  7. Uchenye zapiski: Serii︠a︡ khimicheskikh nauk (S.M. Kirov adyna Azărbai̐jan Dȯvlăt Universiteti; 1975), page 78. Retrieved January 13, 2021. (Translated from Vietnamese) https://books.google.com/books?id=OJs4AAAAIAAJ ↩

  8. 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. https://books.google.com/books?id=8VlHAQAAIAAJ ↩

  9. 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). https://www.finechem-mirea.ru/jour/article/view/969/1015 ↩