STUDY OF A NEW HYDRAZONE SYSTEM WITH ION COMPLEXATION CAPACITY SUITABLE FOR SELECTIVE DETECTION.

The design and synthesis of chemosensors that allows the selectively detection of heavy metal cations by complexation, is an area of growing interest. The hydrazone functional group has been widely used in supramolecular chemistry due to its complexing capacity, its conjugated electrons, and its simple methods of synthesis. In this way, a nitrogen system derived from the condensation of vanillin (aromatic aldehyde) and 2-hydrazinobenzothiazole to give the corresponding hydrazone for the detection of Cu2+ was developed. Spectroscopic determinations demonstrate whether the complexing took place. The hidrazone showed a response in UV–vis spectroscopy and a color shift is observed with the naked eye. In addition, theoretical analysis based on the Density Functional Theory (DFT) was realized to understand the chemical changes that the ligand suffers in the complexation process with the Cu2+ ion through the study of the structural, electronics, and optical properties.