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Neodymium(II) iodide
Names
	IUPAC name Diiodoneodymium
	Other names Neodymium diiodide
Identifiers
CAS Number	61393-36-0;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.150.931
EC Number	622-142-8;
PubChem CID	57351516;
CompTox Dashboard (EPA)	DTXSID30722364 ;
	InChI InChI=1S/2HI.Nd/h2*1H;/p-2 Key: XKFMXEILCPYOQT-UHFFFAOYSA-L;
	SMILES [I-].[I-].[Nd+2];
Properties
Chemical formula	NdI2
Molar mass	398.05
Appearance	dark violet solid
Structure
Crystal structure	SrBr2 type (Tetragonal)
Space group	P4/n (No. 85)
Lattice constant	a = 1257.3 pm, c = 765.8 pm
Formula units (Z)	10
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H317, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P272, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P333+P313, P337+P317, P362+P364, P403+P233, P405, P501
Related compounds
Other anions	Neodymium(II) fluoride, Neodymium(II) chloride, Neodymium(II) bromide
Other cations	lanthanum diiodide, cerium diiodide, praseodymium diiodide, europium diiodide, samarium(II) iodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Neodymium(II) iodide or neodymium diiodide is an inorganic salt of iodine and neodymium the formula NdI₂. Neodymium uses the +2 oxidation state in the compound.

Neodymium(II) iodide is a violet solid.^[1] The compound is not stoichiometric.^[4] It melts at 562°C.^[5]

Preparation

Neodymium(II) iodide can be made by heating molten neodymium(III) iodide with neodymium metal at 800 and 580°C for 12 hours.^[4] It can also be obtained by reducing neodymium(III) iodide with neodymium in a vacuum at 800 to 900°C:^[1]

Nd + 2NdI₃ → 3NdI₂

The reaction of neodymium with mercury(II) iodide is also possible because neodymium is more reactive than mercury:^[1]

Nd + HgI₂ → NdI₂ + Hg

Direct preparation from iodine and neodymium is also possible:^[6]

Nd + I₂ → NdI₂

The compound was first synthesized by John D. Corbett in 1961.^[7]

Properties

Neodymium(II) iodide is a violet solid.^[1] The compound is extremely hygroscopic, and can only be stored and handled under carefully dried inert gas or under a high vacuum.^[8] In air it converts into hydrates by absorbing moisture, but these are unstable and more or less rapidly transform into oxide iodides with the evolution of hydrogen:

2NdI₂ + 2H₂O → 2NdOI + H₂↑ + 2HI

Neodymium(II) iodide is not stoichiometric, and has a formula of closer to NdI_1.95.^[4] It melts at 562°C.^[5] It has a strontium(II) bromide-type crystal structure.^[1] Under pressure, this transforms into the molybdenum disilicide structure typically seen in intermetallic compound, which is already present under normal conditions in other rare earth diiodides (e.g. praseodymium(II) iodide and lanthanum(II) iodide).^[9] It forms complexes with tetrahydrofuran and other organic compounds.^[10]^[11]^[12]

Neodymium(II) iodide is an electrical insulator.^[4]

Reactions

Neodymium(II) iodide reacts with organohalides by extracting the halogen, resulting in dimers, oligomers or reactions with the solvent.^[12]

Solvates are known with tetrahydrofuran and dimethoxyethane: NdI₂(THF)₂ and NdI₂(DME)₂.^[13]

Neodymium(II) iodide reduces hot nitrogen to form an iodide nitride: (NdI₂)₃N which with THF also gives (NdI)₃N₂.^[14]

It reacts with cyclopentadiene in THF to give CpNdI₂(THF)₃.^[15]

Applications

Neodymium(II) iodide can be used as a reducing agent or catalyst^[16] in organic chemistry.^[17]

References

^ ^a ^b ^c ^d ^e ^f Handbuch der präparativen anorganischen Chemie (in German). Stuttgart: Enke. 1975. p. 1081. ISBN 3-432-02328-6. OCLC 310719485.
^ Beck, H. P. (1976-11-01). "Notizen: NdI2-II, eine metallisch leitende Hochdruckmodifikation ? / NdI2, a Metallic High Pressure Modification ?". Zeitschrift für Naturforschung B (in German). 31 (11). Walter de Gruyter GmbH: 1548–1549. doi:10.1515/znb-1976-1128. ISSN 1865-7117.
^ ^a ^b See https://pubchem.ncbi.nlm.nih.gov/compound/Neodymium_II_-iodide
^ ^a ^b ^c ^d Sallach, Robert A.; Corbett, John D. (July 1964). "Magnetic Susceptibilities of Neodymium (II) Chloride and Iodide". Inorganic Chemistry. 3 (7): 993–995. doi:10.1021/ic50017a015.
^ ^a ^b Druding, Leonard F.; Corbett, John D. (June 1961). "Lower Oxidation States of the Lanthanides. Neodymium(II) Chloride and Iodide 1". Journal of the American Chemical Society. 83 (11): 2462–2467. doi:10.1021/ja01472a010.
^ Karl A. Jr. Gschneidner, Jean-Claude Bunzli, Vitalij K. Pecharsky (2009). Handbook on the Physics and Chemistry of Rare Earths. Elsevier. p. 247. ISBN 978-008093257-6.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ Angelika Jungmann, R. Claessen, R. Zimmermann, G. e. Meng, P. Steiner, S. Hüfner, S. Tratzky, K. Stöwe, H. P. Beck: Photoemission of LaI₂ and CeI₂. In: Zeitschrift für Physik B Condensed Matter. 97, 1995, S. 25–34, doi:10.1007/BF01317584.
^ Ortu, Fabrizio (2022). "Rare Earth Starting Materials and Methodologies for Synthetic Chemistry". Chem. Rev. 122 (6): 6040–6116. doi:10.1021/acs.chemrev.1c00842. PMC 9007467. PMID 35099940.
^ Ralf Alsfasser, Erwin Riedel (2007). Moderne Anorganische Chemie. Walter de Gruyter. p. 188. ISBN 978-311019060-1.
^ Mikhail N. Bochkarev, Igor L. Fedushkin, Sebastian Dechert, Anatolii A. Fagin, Herbert Schumann: [NdI₂(thf)₅], der erste kristallographisch charakterisierte Neodym(II)-Komplex. In: Angewandte Chemie. 113, 2001, S. 3268–3270, doi:10.1002/1521-3757(20010903)113:17<3268::AID-ANGE3268>3.0.CO;2-K.
^ G. V. Khoroshen kov, A. A. Fagin, M. N. Bochkarev, S. Dechert, H. Schumann: Reactions of neodymium(II), dysprosium(II), and thulium(II) diiodides with cyclopentadiene In: Russian Chemical Bulletin. 52, S. 1715–1719, doi:10.1023/A:1026132017155.
^ ^a ^b Fagin, Anatolii A.; Balashova, Tatyana V.; Kusyaev, Dmitrii M.; et al. (March 2006). "Reactions of neodymium(II) iodide with organohalides". Polyhedron. 25 (5): 1105–1110. doi:10.1016/j.poly.2005.08.050.
^ Bochkarev, Mikhail N.; Fagin, Anatolii A. (24 September 1999). "A New Route to Neodymium(II) and Dysprosium(II) Iodides". Chemistry - A European Journal. 5 (10): 2990–2992. doi:10.1002/(SICI)1521-3765(19991001)5:10<2990::AID-CHEM2990>3.0.CO;2-U.
^ Fagin, A. A.; Salmova, S. V.; Bochkarev, M. N. (January 2009). "Reduction of nitrogen with neodymium(II) and dysprosium(II) diiodides and selected properties of the resulting nitrides". Russian Chemical Bulletin. 58 (1): 230–233. doi:10.1007/s11172-009-0034-2. S2CID 98798042.
^ Khoroshen'kov, G. V.; Fag, A. A.; Bochkarev, M. N.; Dechert, S.; Schumann, H. (1 August 2003). "Reactions of neodymium(ii), dysprosium(ii), and thulium(ii) diiodides with cyclopentadiene. Molecular structures of complexes CpTmI2(THF)3 and [NdI2(THF)5]+[NdI4(THF)2]–". Russian Chemical Bulletin. 52 (8): 1715–1719. doi:10.1023/A:1026132017155. S2CID 91646257.
^ Fundamental Chemistry (2006). Neodymium Based Ziegler Catalysts. Springer. p. 13. ISBN 354034809-3.
^ Handbook on the Physics and Chemistry of Rare Earths. Elsevier. 2009. p. 261. ISBN 978-008093257-6.