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• Description

  Lithium iodide (chemical formula: LiI) is the compound of lithium and iodine. It can be used as an electrolyte in high-temperature batteries, long-life batteries which is required, e.g. by artificial pacemaker as well as in the electrolyte of dye-sensitized solar cells. In organic synthesis, it can be used for C-O bonds cleavage such as converting methyl esters to carboxylic acids. In addition, it can be used as a radio contrast agent for X-ray computed tomography imaging studies.
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• Physical properties

  Lithium iodide, a white crystalline solid, is deliquescent as are lithium chloride and lithium bromide. Lithium iodide is readily oxidized in air to yield iodine which discolors the crystals.
  Lithium iodide is very soluble in water and forms the following hydrates: Lii-0.5 H2O, L i l·O , LiI-2H20 and LiI·3H20. The hydrates have congruent melting points unlike the hydrates of the chloride and the bromide.
  Lithium iodide is even more soluble in organic solvents than the chloride or the bromide.

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• Uses

  Lithium iodide can be used for the catalytic dehydrogenation of hydrocarbons. Oxidation of lithium iodide yields iodine which reacts with the hydrocarbon to form an organic iodide. The intermediate is dehydroiodinated to yield an olefin.For example, butane may be converted to butadiene.;

• Preparation

  The laboratory preparation of lithium iodide is carried out in much the same way as the industrial preparation.
  Lithium iodide is prepared by the reaction of lithium hydroxide monohydrate or lithium carbonate with hydriodic acid, which may be prepared in situ by the reduction of iodine. The iodide is usually not isolated as the anhydrous material but is used as a solution or as the solid lithium iodide trihydrate.
  Hydriodic acid may be prepared by the reaction of hydrogen sulfide and iodine. The hydriodic acid solution must be kept under an inert atmosphere to prevent air oxidation to iodine. After combination of the acid with the lithium compounds, the solution may be evaporated to yield lithium iodide trihydrate, LiI· 3H20. The anhydrous material may be made by extremely careful dehydration of the trihydrate under vacuum and with slow heating. The lithium iodide or its trihydrate must be handled under an inert atmosphere to avoid oxidation of the iodide ion to iodine. ;

• References

  http://en.wikipedia.org/wiki/Lithium_iodide ;

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