In recent years, numerous applications of the cobalt complex system, which is synthesized by the condensation reaction of cobalt salt with a salen-type ethylenediamine ligand, have been established to the benefit of society. These types of complexes containing nitrogen and oxygen in the structure have gained a lot of interest for usage in a wide range of practical applications because of their benefits of being simple to synthesize, having stable chemical characteris-tics, and having good endurance. They can be employed as common parts in high-tech devices, such as optical ones, from a modern perspective. It can also be used in areas directly related to polymers. This kind of structure exhibits an important potential for coordination with metals; it can create complexes with innovative structures that are beneficial to the biological and pharmaceutical sectors by endowing them with unique fea-tures. This metal can interact with the ethylenediamine ligand to form complexes that, among other things, can be exploited for gas storage or molecular identification. The fundamental idea behind this strategy is the creation of two cobalt complexes with a salen-type ligand that was produced through the reaction of 5-chlorosalicilaldehyde and ethylenediamine in the presence of cobalt acetate and characterized using a variety of methods, such as infrared spectroscopy, 1H RMN, and optical methods. As a result, these compounds can be used as important chemical building blocks, practical materials, and possibly in medicine.