Mechanisms of the hydration of A-300 aerosol with adsorbed chlorides of alkali metals in an organic medium

摘要

The hydration of systems obtained via the adsorption of alkali metal chlorides on A-300 nanosilica is studied by means of low-temperature H-1 NMR spectroscopy. It is shown that in weakly polar organic media, adsorbed water is present in the form of weakly and strongly associated water. A reduction in the differentiation of adsorbed water in the SiO2/NaCl > SiO2/KCl > SiO2/LiCl series of composites is established that could be due to changes in the lattice parameters of SiO2. Quantum-chemical calculations are performed for the H-1 NMR spectra of complexes containing clusters of Si8O12(OH)(8) and hydrated ion pairs of alkali metal chlorides. These calculations allow us to explain the displacement in the chemical shifts of water protons.