Niobium(IV) iodide - Misplaced Pages

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-4Key: RRKNUGROPHXWKT-UHFFFAOYSA-J
SMILES ....
Properties
Chemical formula	I₄Nb
Molar mass	600.52425 g·mol
Appearance	grey solid
Density	5.6 g·cm
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 , 100 kPa). Infobox references

Chemical compound

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

Preparation

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

Properties

Niobium(IV) iodide is a grey solid that reacts with water.

Niobium(IV) iodide is an orthorhombic crystal with space group Cmc2₁ (No. 36). 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. Niobium(IV) iodide turns into a metal under extremely high pressure.

References

^ 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.