Copper(I) chloride
Properties, data and information sources.
Contents
Names and Identifiers
Formula
ClCu
CuCl
Molar mass
98.996 (g/mol)
CAS registry number
7758-89-6
EC number EINECS
231-842-9
InChI Key
OXBLHERUFWYNTN-UHFFFAOYSA-M
Other names, synonyms
Cuprous chloride; Dicopper dichloride; Copper monochloride; Copper chloride
Chemical formulas
Molecular formula and structural formula of Copper(I) chloride:
ClCu or CuCl
Mr = 98.996 g/mol
SMILES: Cl[Cu]
Data and Properties
Pure copper(I) chloride exists as a white crystalline solid, but is usually colored greenish due to impurities and oxidation.
solubility:+ Soluble in
hydrochloric acid,
pyridine,
acetonitrile.
- Practically insoluble in
water (0.047 g/L at 20 °C), alcohols, ethers, ketons.
solubility product: 1.72 · 10
-7.
melting point
430 °C
decomposition temperature
1490 °C
density
4.14 g cm-3 at 20 °C
refractive index
nD = 1.930
standard enthalpy of formation
-138.1 kJ/mol [s]
band gap
3.25 eV (300 K)
magnetic susceptibility χ
-40.0 × 10-6 cm3 mol-1
crystal structure:
Zinc blende crystal structure cF20, space group F43m No. 216, lattice constant a = 542.02 pm, Z = 4, lattice volume V = 0.1592 nm3. Above 480 °C, it transforms into a hexagonal crystal structure.
Percentage and isotopic composition:
Mass-related elemental composition and isotope proportions of the compound Copper(I) chloride - ClCu - calculated based on molecular mass.
Symbol
Element ENumber x
of atoms ExData of the element
and isotopes *Percentages
of isotopesPercentage of
Ex in formula massCl
Chlorine1ΣAr = 35.45 u
35Cl: 34.96885 u [75,80 %]
36Cl: 35.96831 u [<< 1 %]
37Cl: 36.9659 u [24,2 %]
35Cl: 27.14362 %
36Cl: trace
37Cl: 8.66591 %
35.8095 %Cu
Copper1ΣAr = 63.546 u
63Cu: 62.9296 u [69,15 %]
65Cu: 64.92779 u [30,85 %]
63Cu: 44.38771 %
65Cu: 19.80276 %
64.1905 % *) The third column lists the atomic masses or isotope masses of the elements involved and - in square brackets - the natural isotope composition.
More calculated data
The molar mass is M = 98.996 grams per mole.
The amount of substance in one kilogram of the substance is n = 10.101 mol.
The amount of substance in one gram of the substance is n = 0.01 mol.
Monoisotopic mass: 97.8984498 Da - related to 35Cl63Cu.
Hazard warnings according to GHS
(General information without guarantee of accuracy and completeness! The information does not replace the chemical safety data sheet or a risk assessment, but rather provides a general overview of the risk posed by the hazardous substance.
Signal word: Warning
GHS hazard statements (H phrases):
H302
Harmful if swallowed
H400
Very toxic to aquatic life
H410
Very toxic to aquatic life with long lasting effects
LD50 (rat, oral): 140 mg/kg.
Labeling in the EU: See ECHA Substance Infocard 100.028.948.
For toxicology and occupational safety when handling Copper(I) chloride as well as measures to be taken in case of danger, see: Hazardous Substances Information System GESTIS, ZVG-Nr. 003280.
External Sources
PubChem:ID 62652ChemSpider:ID 56403UNII of the FDA (USA):Unique Ingredient Identifier C955P95064EPA CompTox Chemicals Dashboard:DTXSID5035242Other CAS RN:11093-68-8; 12258-96-7; 12622-24-1; 53906-70-0; 53906-71-1; 53906-72-2; 53906-73-3 (also used, outdated or deleted registration numbers)
Manufacturers and Sources of Supply
The table below lists producers and suppliers of Copper(I) chloride as a commercial chemical for laboratories, research, industry and production with the corresponding contact details.
Last update: 2026-01-18
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