Niobium(IV) iodide

Niobium(IV) iodide
Names
	Other names Niobium tetraiodide
Identifiers
CAS Number	13870-21-8;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/4HI.Nb/h4*1H;/q;;;;+4/p-4 Key: RRKNUGROPHXWKT-UHFFFAOYSA-J;
	SMILES [I-].[I-].[I-].[I-].[Nb+4];
Properties
Chemical formula	I4Nb
Molar mass	600.52425 g·mol−1
Appearance	grey solid
Density	5.6 g·cm−3
Melting point	503 °C
Solubility in water	reacts
Related compounds
Other anions	NbF4, NbCl4, NbBr4
Other cations	TaI4
Related compounds	NbI3, NbI5
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Niobium(IV) iodide is an iodide of niobium, with the chemical formula of NbI₄.

Preparation[edit]

Niobium(IV) iodide can be obtained by the decomposition of niobium(V) iodide under a vacuum at 206-270 °C.^[2]

Properties[edit]

Niobium(IV) iodide is a grey solid that reacts with water.^[1]

Niobium(IV) iodide is an orthorhombic crystal with space group Cmc2₁ (No. 36).^[3] Its crystal is formed by NbI₆ octahedra connected by edges and also contains Nb-Nb bonds. At 348 to 417 °C, the crystal structure of niobium(IV) iodide changes.^[4] Niobium(IV) iodide turns into a metal under extremely high pressure.^[5]

References[edit]

^ ^a ^b ^c ^d ^e Haynes, William M.; Lide, David R.; Bruno, Thomas J. (2017). CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. Boca Raton, Florida. p. 76. ISBN 978-1-4987-5429-3. OCLC 957751024.{{cite book}}: CS1 maint: location missing publisher (link)
^ Perry, Dale L. (2011). Handbook of Inorganic Compounds. Boca Raton, FL. p. 298. ISBN 978-1-4398-1462-8. OCLC 759865801.{{cite book}}: CS1 maint: location missing publisher (link)
^ Dahl, L. F.; Wampler, D. L. (1962-09-01). "The crystal structure of α-niobium tetraiodide". Acta Crystallographica. 15 (9). International Union of Crystallography (IUCr): 903–911. doi:10.1107/s0365110x62002340. ISSN 0365-110X.
^ Gutmann, Viktor (1967). Halogen chemistry. Volume 3 (in Dutch). London: Academic Press. p. 170. ISBN 978-0-323-14847-4. OCLC 846981003.
^ Kawamura, H.; Matsui, N.; Nakahata, I.; Kobayashi, M.; Akahama, Y.; Shirotani, I. (1998). "Structural studies of NbI4 at high pressures". Solid State Communications. 108 (12). Elsevier BV: 919–921. Bibcode:1998SSCom.108..919K. doi:10.1016/s0038-1098(98)00483-9. ISSN 0038-1098.

[William_M._Haynes-1] Haynes, William M.; Lide, David R.; Bruno, Thomas J. (2017). CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. Boca Raton, Florida. p. 76. ISBN 978-1-4987-5429-3. OCLC 957751024.{{cite book}}: CS1 maint: location missing publisher (link)

[Dale_L._Perry-2] Perry, Dale L. (2011). Handbook of Inorganic Compounds. Boca Raton, FL. p. 298. ISBN 978-1-4398-1462-8. OCLC 759865801.{{cite book}}: CS1 maint: location missing publisher (link)

[3] Dahl, L. F.; Wampler, D. L. (1962-09-01). "The crystal structure of α-niobium tetraiodide". Acta Crystallographica. 15 (9). International Union of Crystallography (IUCr): 903–911. doi:10.1107/s0365110x62002340. ISSN 0365-110X.

[Viktor_Gutmann-4] Gutmann, Viktor (1967). Halogen chemistry. Volume 3 (in Dutch). London: Academic Press. p. 170. ISBN 978-0-323-14847-4. OCLC 846981003.

[5] Kawamura, H.; Matsui, N.; Nakahata, I.; Kobayashi, M.; Akahama, Y.; Shirotani, I. (1998). "Structural studies of NbI4 at high pressures". Solid State Communications. 108 (12). Elsevier BV: 919–921. Bibcode:1998SSCom.108..919K. doi:10.1016/s0038-1098(98)00483-9. ISSN 0038-1098.

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