Copper(II) halides are chemical compounds formed by the combination of copper in its +2 oxidation state with halogen elements, such as chlorine, bromine, or iodine. The most common copper(II) halides include copper(II) chloride (CuCl₂), copper(II) bromide (CuBr₂), and copper(II) iodide (CuI₂). These compounds typically appear as colored solids and are used in various applications, including catalysis and as pigments. These compounds exhibit distinct properties based on the halide they contain. For example, copper(II) chloride is soluble in water, while copper(II) iodide is less soluble. Copper(II) halides can also participate in chemical reactions, making them important in organic synthesis and materials science.