Abstract
Nickel(II) salts with unsaturated monocarboxylic acids (acrylic, methacrylic, sorbic, 4-pentynoic, propiolic, crotonic, linoleic, and oleic acids) have been synthesized. The compounds have been studied by thermogravimetry, differential scanning calorimetry, elemental analysis, and IR spectroscopy. Controlled thermolysis of the obtained carboxylates afforded nickel-containing nanocomposites, which were studied by elemental analysis, IR spectroscopy, scanning and transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray powder diffraction analysis. The enthalpies of the reaction $$\Delta H_{{\text{r}}}^{^\circ }$$ for the formation of unsaturated nickel(II) monocarboxylates have been calculated by the semi-empirical quantum-chemical РМ3 method. A positive correlation has been found between the average nanoparticle diameter (dav) of nanocomposites and $$\Delta H_{{\text{r}}}^{^\circ }.$$ The magnetic properties of the obtained nanocomposites have been studied.
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