Used primarily as a key intermediate in the synthesis of functionalized bipyridyl ligands for coordination chemistry. It enables the attachment of bipyridyl complexes to polymers, surfaces, or biomolecules through the reactive bromomethyl group. Commonly employed in the development of ruthenium- or iridium-based photoredox catalysts, where the methyl group can be further modified to tune electronic properties. Also applied in the preparation of metallo-supramolecular architectures, such as molecular cages and switches, due to its ability to form stable complexes with transition metals. Its reactivity allows for easy alkylation of nitrogen-containing heterocycles, facilitating the construction of complex multidentate ligands.