Used as a catalyst in organic synthesis, particularly in coupling reactions such as Ullmann-type reactions where carbon-oxygen or carbon-nitrogen bonds are formed. It is effective in promoting ether and ester formation under mild conditions. Also applied in the development of pharmaceutical intermediates due to its selective reactivity and stability in air when handled properly. Shows utility in materials science for constructing conjugated systems in organic semiconductors and polymers. Its copper(I) center facilitates electron transfer processes, making it suitable for use in certain photochemical reactions and light-emitting diode (LED) research.