1,4,7-Triazacyclononane is widely used as a chelating agent in coordination chemistry due to its ability to form stable complexes with metal ions. It is particularly valuable in the development of contrast agents for magnetic resonance imaging (MRI), where it helps enhance the visibility of internal body structures. Additionally, it plays a role in catalysis, especially in processes involving transition metals, where it improves reaction efficiency and selectivity. The compound is also explored in supramolecular chemistry for designing molecular sensors and switches, leveraging its strong binding affinity to specific metal ions.