Niobium(IV) iodide

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Niobium(IV) iodide
NbI4 unit cell.png
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
Appearancegrey 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).

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

Contents

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]

Related Research Articles

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<span class="mw-page-title-main">Nickel(II) iodide</span> Chemical compound

Nickel(II) iodide is an inorganic compound with the formula NiI2. This paramagnetic black solid dissolves readily in water to give bluish-green solutions, from which crystallizes the aquo complex [Ni(H2O)6]I2 (image above). This bluish-green colour is typical of hydrated nickel(II) compounds. Nickel iodides find some applications in homogeneous catalysis.

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<span class="mw-page-title-main">Niobium pentoxide</span> Chemical compound

Niobium pentoxide is the inorganic compound with the formula Nb2O5. A colorless, insoluble, and fairly unreactive solid, it is the most widespread precursor for other compounds and materials containing niobium. It is predominantly used in alloying, with other specialized applications in capacitors, optical glasses, and the production of lithium niobate.

Germanium iodides are inorganic compound with the formula GeIx. Two such compounds exist: germanium(II) iodide, GeI2, and germanium(IV) iodide GeI4.

<span class="mw-page-title-main">Niobium monoxide</span> Chemical compound

Niobium monoxide is the inorganic compound with the formula NbO. It is a grey solid with metallic conductivity.

<span class="mw-page-title-main">Niobium(IV) chloride</span> Chemical compound

Niobium(IV) chloride, also known as niobium tetrachloride, is the chemical compound of formula NbCl4. This compound exists as dark violet crystals, is highly sensitive to air and moisture, and disproportiates into niobium(III) chloride and niobium(V) chloride when heated.

<span class="mw-page-title-main">Uranium trifluoride</span> Chemical compound

Uranium trifluoride is an inorganic chemical compound with the chemical formula UF3.

<span class="mw-page-title-main">Germanium(IV) iodide</span> Chemical compound

Germanium(IV) iodide is an inorganic compound with the chemical formula GeI4.

<span class="mw-page-title-main">Hafnium(IV) iodide</span> Chemical compound

Hafnium(IV) iodide is the inorganic compound with the formula HfI4. It is a red-orange, moisture sensitive, sublimable solid that is produced by heating a mixture of hafnium with excess iodine. It is an intermediate in the crystal bar process for producing hafnium metal.

<span class="mw-page-title-main">Niobium pentaiodide</span> Chemical compound

Niobium pentaiodide is the inorganic compound with the formula Nb2I10. Its name comes from the compound's empirical formula, NbI5. It is a diamagnetic, yellow solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two NbI5 units are joined by a pair of iodide bridges. There is no bond between the Nb centres. Niobium(V) chloride, niobium(V) bromide, tantalum(V) chloride, tantalum(V) bromide, and tantalum(V) iodide, all share this structural motif.

<span class="mw-page-title-main">Niobium diselenide</span> Chemical compound

Niobium diselenide or niobium(IV) selenide is a layered transition metal dichalcogenide with formula NbSe2. Niobium diselenide is a lubricant, and a superconductor at temperatures below 7.2 K that exhibit a charge density wave (CDW). NbSe2 crystallizes in several related forms, and can be mechanically exfoliated into monatomic layers, similar to other transition metal dichalcogenide monolayers. Monolayer NbSe2 exhibits very different properties from the bulk material, such as of Ising superconductivity, quantum metallic state, and strong enhancement of the CDW.

<span class="mw-page-title-main">Neodymium(II) iodide</span> Chemical compound

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.

<span class="mw-page-title-main">Tetraiodine nonoxide</span> Chemical compound

Tetraiodine nonoxide is an iodine oxide with the chemical formula I4O9.

<span class="mw-page-title-main">Lanthanum diiodide</span> Chemical compound

Lanthanum diiodide is an iodide of lanthanum, with the chemical formula of LaI2. It is an electride, actually having a chemical formula of La3+[(I−)2e−].

<span class="mw-page-title-main">Cerium diiodide</span> Chemical compound

Cerium diiodide is an iodide of cerium, with the chemical formula of CeI2.

Hafnium compounds are compounds containing the element hafnium (Hf). Due to the lanthanide contraction, the ionic radius of hafnium(IV) (0.78 ångström) is almost the same as that of zirconium(IV) (0.79 angstroms). Consequently, compounds of hafnium(IV) and zirconium(IV) have very similar chemical and physical properties. Hafnium and zirconium tend to occur together in nature and the similarity of their ionic radii makes their chemical separation rather difficult. Hafnium tends to form inorganic compounds in the oxidation state of +4. Halogens react with it to form hafnium tetrahalides. At higher temperatures, hafnium reacts with oxygen, nitrogen, carbon, boron, sulfur, and silicon. Some compounds of hafnium in lower oxidation states are known.

<span class="mw-page-title-main">Tantalum(IV) iodide</span> Chemical compound

Tantalum(IV) iodide is an inorganic compound with the chemical formula TaI4. It dissolves in water to give a green solution, but the color fades when left in the air and produces a white precipitate.

<span class="mw-page-title-main">Tungsten(II) iodide</span> Chemical compound

Tungsten(II) iodide is an iodide of tungsten, with the chemical formula [W6I8]I4, or abbreviated as WI2.

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. 15 (9). International Union of Crystallography (IUCr): 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. 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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