Lithium iodide

Lithium iodide
Identifiers

CAS Number	10377-51-2^Y 17023-24-4 (monohydrate)^N 17023-25-5 (dihydrate)^N 7790-22-9 (trihydrate)^N
3D model (Jmol)	Interactive image
ChemSpider	59699^Y
ECHA InfoCard	100.030.735
PubChem	66321
UNII	S6K2XET783^N
InChI InChI=1S/HI.Li/h1H;/q;+1/p-1^Y Key: HSZCZNFXUDYRKD-UHFFFAOYSA-M^Y InChI=1/HI.Li/h1H;/q;+1/p-1 Key: HSZCZNFXUDYRKD-REWHXWOFAM
SMILES [Li+].[I-]
Properties
Chemical formula	LiI
Molar mass	133.85 g/mol
Appearance	White crystalline solid
Density	4.076 g/cm³ (anhydrous) 3.494 g/cm³ (trihydrate)
Melting point	469 °C (876 °F; 742 K)
Boiling point	1,171 °C (2,140 °F; 1,444 K)
Solubility in water	1510 g/L (0 °C) 1670 g/L (25 °C) 4330 g/L (100 °C)
Solubility	soluble in ethanol, propanol, ethanediol, ammonia
Solubility in methanol	3430 g/L (20 °C)
Solubility in acetone	426 g/L (18 °C)
Magnetic susceptibility (χ)	−50.0·10⁻⁶ cm³/mol
Refractive index (n_D)	1.955
Thermochemistry
Specific heat capacity (C)	0.381 J/g K or 54.4 J/mol K
Std molar entropy (S^o₂₉₈)	75.7 J/mol K
Std enthalpy of formation (Δ_fH^o₂₉₈)	-2.02 kJ/g or −270.48 kJ/mol
Gibbs free energy (Δ_fG˚)	-266.9 kJ/mol
Hazards
Safety data sheet	External MSDS
Flash point	Non-flammable
Related compounds
Other anions	Lithium fluoride Lithium chloride Lithium bromide Lithium astatide
Other cations	Sodium iodide Potassium iodide Rubidium iodide Caesium iodide Francium iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N (what is ^YN ?)
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. It crystallizes in the NaCl motif. It can participate in various hydrates.

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. It is also used, in a complex with Iodine, in the electrolyte of dye-sensitized solar cells.

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

Similar reactions apply to epoxides and aziridines.

Lithium iodide was used as a radio contrast agent for X-ray computed tomography imaging studies. Its use was discontinued due to renal toxicity, replaced by organic iodine molecules. Inorganic iodine solutions suffered from hyperosmolarity and high viscosities.

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