Niobium(IV) iodide
Names
Other names
Niobium tetraiodide
Identifiers
3D model (JSmol)
  • InChI=1S/4HI.Nb/h4*1H;/q;;;;+4/p-4
    Key: RRKNUGROPHXWKT-UHFFFAOYSA-J
  • [I-].[I-].[I-].[I-].[Nb+4]
Properties
I4Nb
Molar mass 600.52425 g·mol−1
Appearance grey solid[1]
Density 5.6 g·cm−3[1]
Melting point 503 °C[1]
reacts[1]
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

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

Properties

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

  1. 1 2 3 4 5 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)
  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. International Union of Crystallography (IUCr). 15 (9): 903–911. doi:10.1107/s0365110x62002340. ISSN 0365-110X.
  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. Elsevier BV. 108 (12): 919–921. Bibcode:1998SSCom.108..919K. doi:10.1016/s0038-1098(98)00483-9. ISSN 0038-1098.
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