Cuprous Chloride (CuCl) Semiconductors

Topics Covered

Chemical Properties
Thermal, Mechanical and Optical Properties
Safety Information


Copper chloride, commonly called as cuprous chloride, is the lower chloride of copper, with the formula CuCl. It is a white solid sparingly soluble in water and completely soluble in concentrated hydrochloric acid. Impure samples of copper chloride appear green owing to the presence of copper (II) chloride. Robert Boyle first prepared copper chloride from mercury chloride and copper metal.


Cuprous chloride finds applications in the following:

  • Fungicide
  • Blue flame displays
  • Electroplating baths
  • Pigment for glass and ceramics,
  • Mordant in dyeing and printing fabrics
  • Photography.

Chemical Properties

The chemical properties of cuprous chloride are provided in the table below:

Chemical Properties
Chemical Formula CuCl
Molecular Weight 98.99
CAS No. 7752-89-6
Group Copper – 11
Chlorine - 17
Crystal Structure Zinc blende
Lattice Constant a = 3.91 Å
c = 6.42 Å

Electrical Properties

The electrical properties of cuprous chloride are provided in the table below:

Electrical Properties
Dielectric Constant 7.9
Band Gap 3.4 eV

Thermal, Mechanical and Optical Properties

The thermal, mechanical and optical properties of cuprous chloride are provided in the tables below:

Thermal Properties
Heat of Fusion 84 J/g
Mechanical Properties
Density 4.145 g/cm3
Melting Point 426°C
Boiling Point 1490°C
Optical Properties
Refractive Index 1.97
Chromatic Dispersion -0.279 µm-1

Safety Information

Safety Information
GHS Hazard Statements H302 - Harmful if swallowed
H315 - Causes skin irritation
H319 - Causes serious eye irritation
H335 - May cause respiratory irritation
H410 - Very toxic to aquatic life with long lasting effects.
Safety Precautions P261 - Avoid breathing dust
P273 - Avoid release to the environment
P305 + P351 + P338 - If in eyes, rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P501 - Dispose of contents/container to an approved waste disposal plant.



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