2-Bromo-1,10-phenanthroline is primarily used in coordination chemistry as a ligand to form complexes with various metal ions. Its application is significant in the development of luminescent materials, where it helps in creating compounds with specific optical properties. This chemical is also utilized in the synthesis of catalysts for organic reactions, particularly in processes that require precise control over the electronic environment of the metal center. Additionally, it finds use in research focused on the study of electron transfer processes and in the design of molecular sensors that can detect specific ions or molecules based on changes in fluorescence or absorbance.