Neocuproine hemihydrate is widely used as a chelating agent in analytical chemistry, particularly for the determination of copper ions in various samples. Its ability to form stable complexes with copper makes it valuable in spectrophotometric assays, where it helps in accurately measuring copper concentrations in environmental, biological, and industrial samples. Additionally, it is employed in biochemical research to study copper-mediated processes and enzyme activities, providing insights into the role of copper in biological systems. Its application extends to materials science, where it aids in the synthesis and characterization of copper-based nanomaterials and catalysts.