1,1'-Biisoquinoline is primarily utilized in the field of organic synthesis and coordination chemistry. It serves as a versatile ligand in the formation of metal complexes, particularly with transition metals, due to its ability to coordinate through nitrogen atoms. These complexes are often studied for their potential applications in catalysis, such as in asymmetric synthesis and polymerization processes. Additionally, 1,1'-Biisoquinoline is employed in the development of luminescent materials, where its metal complexes exhibit interesting photophysical properties, making them suitable for use in organic light-emitting diodes (OLEDs) and sensors. Its rigid structure also makes it a valuable building block in the design of supramolecular assemblies and molecular recognition systems.