Imine ligands also play an important role in organometallic chemistry, especially in catalytic reactions. Imine ligands can affect the electronic structure, stability and reactivity of metal centers by forming complexes with transition metals. Imine ligands generally form coordination bonds with metal ions through their nitrogen atoms. Common imine ligands include secondary imines (such as R₂C=NH) and tertiary imines (such as R₂C=NR'). The role of imine ligands in transition metal catalytic reactions is multifaceted. They can increase the stability of catalysts by adjusting the electron density of metals and stabilizing the oxidation state of metals, and can also improve the selectivity of reactions through steric and electronic effects. They play a key role in many organic synthesis reactions and are one of the important ligands for designing efficient catalysts.