Lithium iodide

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Lithium iodide
Identifiers
CAS number10377-51-2 YesY
17023-24-4 (monohydrate)
17023-25-5 (dihydrate)
7790-22-9 (trihydrate)
PubChem66321
ChemSpider59699 YesY
Jmol-3D imagesImage 1
Properties
Molecular formulaLiI
Molar mass133.85 g/mol
AppearanceWhite crystalline solid
Density4.076 g/cm3 (anhydrous)
3.494 g/cm3 (trihydrate)
Melting point469 °C
Boiling point1171 °C
Solubility in water151 g/100 mL (25 °C)
433 g/100 mL (100 °C) [1]
Solubility in methanol343 g/100 mL (20 °C)
Solubility in acetone42.6 g/100 mL (18 °C)
Refractive index (nD)1.955
Thermochemistry
Std enthalpy of
formation
ΔfHo298
-2.02 kJ/g or -270.48 kJ/mol
Specific heat capacity, C0.381 J/g K
Hazards
MSDSExternal MSDS
EU IndexNot listed
Flash pointNon-flammable
Related compounds
Other anionsLithium fluoride
Lithium chloride
Lithium bromide.
Other cationsSodium iodide
Potassium iodide
Rubidium iodide
Caesium iodide
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references
 
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Lithium iodide
Identifiers
CAS number10377-51-2 YesY
17023-24-4 (monohydrate)
17023-25-5 (dihydrate)
7790-22-9 (trihydrate)
PubChem66321
ChemSpider59699 YesY
Jmol-3D imagesImage 1
Properties
Molecular formulaLiI
Molar mass133.85 g/mol
AppearanceWhite crystalline solid
Density4.076 g/cm3 (anhydrous)
3.494 g/cm3 (trihydrate)
Melting point469 °C
Boiling point1171 °C
Solubility in water151 g/100 mL (25 °C)
433 g/100 mL (100 °C) [1]
Solubility in methanol343 g/100 mL (20 °C)
Solubility in acetone42.6 g/100 mL (18 °C)
Refractive index (nD)1.955
Thermochemistry
Std enthalpy of
formation
ΔfHo298
-2.02 kJ/g or -270.48 kJ/mol
Specific heat capacity, C0.381 J/g K
Hazards
MSDSExternal MSDS
EU IndexNot listed
Flash pointNon-flammable
Related compounds
Other anionsLithium fluoride
Lithium chloride
Lithium bromide.
Other cationsSodium iodide
Potassium iodide
Rubidium iodide
Caesium iodide
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Lithium iodide, or LiI, is a compound of lithium and iodine. When exposed to air, it becomes yellow in color, due to the oxidation of iodide to iodine.[2] It crystallizes in the NaCl motif.[3] Various hydrates are also known.[4]

Applications[edit]

Lithium iodide is used as an electrolyte for high temperature batteries. It is also used for long life batteries as required, for example, by artificial pacemakers. The solid is used as a phosphor for neutron detection.[5] It is also used, in a complex with Iodine, in the electrolyte of dye-sensitized solar cell.

In organic synthesis, LiI is useful for cleaving C-O bonds. For example it can be used to convert methyl esters to carboxylic acids:[6]

RCO2CH3 + LiI + H2O → RCO2H + LiOH + CH3I

Similar reactions apply to epoxides and aziridines.

See also[edit]

References[edit]

  1. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
  2. ^ "A PDF file from ESPICorp Inc., a supplier of lithium iodide" (PDF). Retrieved 2005-09-16. 
  3. ^ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
  4. ^ Ulrich Wietelmann, Richard J. Bauer "Lithium and Lithium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH: Weinheim. doi:10.1002/14356007.a15_393.
  5. ^ Some lithium iodide phosphors for slow neutron detection, K. P. Nicholson et al. Br. J. Appl. Phys. 6 104-106 (1955) doi:10.1088/0508-3443/6/3/311
  6. ^ André B. Charette, J. Kent Barbay, Wei He "Lithium Iodide" in Encyclopedia of Reagents for Organic Synthesis, 2005, John Wiley & Sons. doi:10.1002/047084289X.rl121.pub2

External links[edit]