STUDY OF THE INTERACTION BETWEEN COPPER(II) CHLORIDE AND N,N′-DIETHYLHYDROXYAMINE

Chemical modification of polymers to impart new functional properties remains one of the most actively developing areas of materials science. In this context, particular attention is drawn to the possibility of using transition metals with high coordination capacity for targeted action on the structure and properties of polymer systems. Modification of macromolecules by introducing metal ions allows one to regulate such characteristics as thermal stability, elastic modulus, permeability, and electrophysical properties. One such approach is the use of copper (II) ions in combination with organic reducing agents capable of not only stabilizing the coordination center, but also initiating structural transformations in the resulting system. In this paper, we studied the interaction of copper (II) chloride (CuCl₂) with N,N′-diethylhydroxylamine (DEHA) at different molar ratios in order to study the mechanisms of formation of coordination structures and their effect on electrophysical properties. A set of spectral studies was carried out, including infrared (IR) and electron spectroscopy. Based on the obtained IR spectra, it was shown that at a ratio of [CuCl₂]:[DEHA] = 1:1, the -OH bands disappear and characteristic bands appear, indicating the formation of nitrone. The electronic spectra demonstrate the disappearance of d-d transitions characteristic of Cu(II) ions, which indicates the reduction of copper to Cu(I). At the same time, a sharp decrease in the specific volume electrical resistance of the interaction products was established. The minimum values are achieved at a molar ratio of [CuCl₂]:[DEHA] = 1:1, where the decrease in the specific volume resistance decreases by more than three orders of magnitude. The dynamics of changes in the specific volume electrical resistance and its stability over time allow us to conclude that the electronic mechanism of charge transfer associated with exchange interactions between metal ions in various oxidation states dominates. The obtained results demonstrate the potential for using such coordination systems as active components for creating conducting or semiconducting polymeric materials with increased functionality and adaptable electrical properties.