N,N’-Bis(salicylidene)ethylenediamine, commonly referred to as salen, is a bidentate ligand characterized by two salicylaldehyde units linked through an ethylene diamine backbone. Its molecular formula is C16H16N2O2, and it features both imine (-C=N-) and hydroxyl (-OH) functional groups. Salen ligands are of significant interest in coordination chemistry due to their ability to form stable metal complexes, particularly with transition metals such as cobalt, nickel, and copper. These complexes exhibit remarkable catalytic, magnetic, and electronic properties, making them essential in various applications, including catalysis, sensors, and bioinorganic chemistry.