Copper(I) iodide
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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.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Copper(I) iodide | |
Other names
Cuprous iodide, marshite | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.028.795 |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
CuI | |
Molar mass | 190.45 g/mol |
Appearance | White solid |
Odor | odorless |
Density | 5.67 g/cm3 [1] |
Melting point | 606 °C (1,123 °F; 879 K) |
Boiling point | 1,290 °C (2,350 °F; 1,560 K) (decomposes) |
0.000042 g/100 mL | |
Solubility product (Ksp) |
1.27 x 10−12 [2] |
Solubility | soluble in ammonia and iodide solutions insoluble in dilute acids |
Vapor pressure | 10 mm Hg (656 °C) |
-63.0·10−6 cm3/mol | |
Refractive index (nD) |
2.346 |
Structure | |
zincblende | |
Tetrahedral anions and cations | |
Hazards | |
GHS labelling: | |
Danger | |
H302, H315, H319, H335, H410 | |
P261, P273, P305+P351+P338, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 1 mg/m3 (as Cu)[3] |
REL (Recommended) |
TWA 1 mg/m3 (as Cu)[3] |
IDLH (Immediate danger) |
TWA 100 mg/m3 (as Cu)[3] |
Safety data sheet (SDS) | Sigma Aldrich |
Related compounds | |
Other anions |
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Other cations |
silver iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Close
Copper(I) iodide is white, but samples often appear tan or even, when found in nature as rare mineral marshite, reddish brown, but such color is due to the presence of impurities. It is common for samples of iodide-containing compounds to become discolored due to the facile aerobic oxidation of the iodide anion to molecular iodine.[4][5][6]