Complexes of poly(1-vinylimidazole) with aluminum ions in aqueous media

The interaction of aluminum ions with poly(1-vinylimidazole) in an aqueous medium was studied as a function of the hydrolysis degree under the action of NaOH. An increase in the content of Al 13 O 4 (OH) 7+ 24 hydroxo complexes and NMR-inactive polymeric forms in the solution caused by the presence of poly(1-vinylimidazole) was established using potentiometric titration, 27 Al NMR, and IR spectroscopy. Upon attaining a twofold excess of the alkali with respect to aluminum ions, the formation of an insoluble complex of the organic polymer with aluminum hydroxide, stabilized by hydrogen bonds involving pyridine nitrogen atoms of azole units, was observed. X-ray diffraction analysis data indicate the suppression of crystallization of aluminum hydroxide in the presence of poly(1-vinylimidazole).