Tungsten(II) iodide

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Tungsten(II) iodide
Mo6Cl12-xtal-1993-CM-3D-balls.png
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/2HI.W/h2*1H;/q;;+2/p-2
    Key: BMKSRUJKNOBSHP-UHFFFAOYSA-L
  • [I-].[I-].[W+2]
Properties
I2W
Molar mass 437.65 g·mol−1
Appearancedark brown solid [1]
Density 6.79 g·cm−3 [2]
Melting point 800 °C (decomposes) [2]
insoluble [2]
Related compounds
Other anions
tungsten(II) chloride
tungsten(II) bromide
Other cations
chromium(II) iodide
molybdenum(II) iodide
Related compounds
 tungsten(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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

Contents

Preparation

Tungsten diiodide can obtained from the decomposition from tungsten(III) iodide: [1]

6 WI3 → [W6I8]I4 + 3 I2

It can also be formed by the displacement reaction of tungsten(II) chloride and iodine: [1]

[W6Cl8]Cl4 + 12 I → [W6I8]I4 + 12 Cl

It can also be formed by the direct reaction of tungsten and iodine, which is a reversible reaction. This reaction can be used in halogen lamps. [3]

W + I2 ⇌ WI2

Tungsten(II) iodide can also be obtained by reacting tungsten hexacarbonyl with iodine. [4]

Properties

Tungsten(II) iodide is a dark brown-colored solid that is stable in air and moisture. Its structure is the same as tungsten(II) chloride, crystallising orthorhombic crystal system, with space group Bbem (No. 64), and lattice parameters a = 1258 pm, b = 1259 pm, c = 1584 pm. [1]

Related Research Articles

<span class="mw-page-title-main">Iodine</span> Chemical element, symbol I and atomic number 53

Iodine is a chemical element; it has symbol I and atomic number 53. The heaviest of the stable halogens, it exists at standard conditions as a semi-lustrous, non-metallic solid that melts to form a deep violet liquid at 114 °C (237 °F), and boils to a violet gas at 184 °C (363 °F). The element was discovered by the French chemist Bernard Courtois in 1811 and was named two years later by Joseph Louis Gay-Lussac, after the Ancient Greek Ιώδης 'violet-coloured'.

<span class="mw-page-title-main">Hydrogen iodide</span> Chemical compound

Hydrogen iodide (HI) is a diatomic molecule and hydrogen halide. Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid. Hydrogen iodide and hydroiodic acid are, however, different in that the former is a gas under standard conditions, whereas the other is an aqueous solution of the gas. They are interconvertible. HI is used in organic and inorganic synthesis as one of the primary sources of iodine and as a reducing agent.

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

Copper(I) iodide is the inorganic compound with the formula CuI. It is also known as cuprous iodide. It is useful in a variety of applications ranging from organic synthesis to cloud seeding.

<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.

<span class="mw-page-title-main">Titanium tetraiodide</span> Chemical compound

Titanium tetraiodide is an inorganic compound with the formula TiI4. It is a black volatile solid, first reported by Rudolph Weber in 1863. It is an intermediate in the van Arkel–de Boer process for the purification of titanium.

<span class="mw-page-title-main">Tellurium tetraiodide</span> Chemical compound

Tellurium tetraiodide (TeI4) is an inorganic chemical compound. It has a tetrameric structure which is different from the tetrameric solid forms of TeCl4 and TeBr4. In TeI4 the Te atoms are octahedrally coordinated and edges of the octahedra are shared.

Iodine can form compounds using multiple oxidation states. Iodine is quite reactive, but it is much less reactive than the other halogens. For example, while chlorine gas will halogenate carbon monoxide, nitric oxide, and sulfur dioxide, iodine will not do so. Furthermore, iodination of metals tends to result in lower oxidation states than chlorination or bromination; for example, rhenium metal reacts with chlorine to form rhenium hexachloride, but with bromine it forms only rhenium pentabromide and iodine can achieve only rhenium tetraiodide. By the same token, however, since iodine has the lowest ionisation energy among the halogens and is the most easily oxidised of them, it has a more significant cationic chemistry and its higher oxidation states are rather more stable than those of bromine and chlorine, for example in iodine heptafluoride.

Tin(IV) iodide, also known as stannic iodide, is the chemical compound with the formula SnI4. This tetrahedral molecule crystallizes as a bright orange solid that dissolves readily in nonpolar solvents such as benzene.

<span class="mw-page-title-main">Beryllium iodide</span> Chemical compound

Beryllium iodide is the inorganic compound with the formula BeI2. It is a hygroscopic white solid.

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

Germanium(II) iodide is an iodide of germanium, with the chemical formula of GeI2.

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

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

Iron(II) iodide is an inorganic compound with the chemical formula FeI2. It is used as a catalyst in organic reactions.

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

Molybdenum(III) iodide is the inorganic compound with the formula MoI3.

Tungsten(III) iodide or tungsten triiodide is a chemical compound of tungsten and iodine with the formula WI3.

Iron(III) iodide is an inorganic compound with the chemical formula FeI3. It is a thermodynamically unstable compound that is difficult to prepare. Nevertheless, iron(III) iodide has been synthesised in small quantities in the absence of air and water.

<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">Praseodymium diiodide</span> Chemical compound

Praseodymium diiodide is a chemical compound with the empirical formula of PrI2, consisting of praseodymium and iodine. It is an electride, with the ionic formula of Pr3+(I−)2e−, and therefore not a true praseodymium(II) compound.

Europium(III) iodide is an inorganic compound containing europium and iodine with the chemical formula EuI3.

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

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

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

Holmium(III) iodide is an iodide of holmium, with the chemical formula of HoI3. It is used as a component of metal halide lamps.

References

  1. 1 2 3 4 Handbuch der präparativen anorganischen Chemie. 3 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1981. ISBN   978-3-432-87823-2.
  2. 1 2 3 Haynes, William M.; Lide, David R.; Bruno, Thomas J. (2012). CRC handbook of chemistry and physics: a ready reference book of chemical and physical data (93rd ed.). Boca Raton: CRC. ISBN   978-1-4398-8049-4.
  3. ↑ Latscha, Hans Peter; Mutz, Martin (2011). Chemie der Elemente. Chemie-Basiswissen. Berlin Heidelberg: Springer. ISBN   978-3-642-16915-1.
  4. ↑ Johnson, Brian Frederick Gilbert (1972). Inorganic chemistry of the transition elements. A specialist periodical report. London: Chemical society. ISBN   978-0-85186-500-3.
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