Widely used as a catalyst in organic synthesis, particularly in coupling reactions such as the Ullmann reaction and other cross-coupling processes involving aryl halides. It plays a key role in the synthesis of pharmaceuticals, agrochemicals, and fine chemicals by facilitating carbon-heteroatom and carbon-carbon bond formation.

Commonly employed in industrial processes for the chlorination of aromatic compounds, replacing iron or aluminum chlorides in some cases due to its higher selectivity and lower corrosiveness. Also used in the production of vinyl chloride and other chlorinated hydrocarbons.

In electroplating, it serves as a source of copper ions in plating baths, contributing to the deposition of copper coatings on metals and other conductive surfaces for protective or decorative purposes.

Used in the laboratory as a reagent for testing the presence of certain functional groups and in oxidation reactions. It reacts with amines and other organic compounds to form colored complexes, useful in qualitative analysis.

Applied in wood preservation as a component in preservative formulations, offering protection against fungi, termites, and decay. Often combined with other metal salts in commercial treatments.

Found in some dyeing and printing processes in the textile industry, where it acts as a mordant to fix dyes on fabrics, improving color fastness and intensity.

Also utilized in the manufacture of pigments and colorants for ceramics and glass, contributing to green and blue hues when heated under controlled conditions.