Investigation of the interaction of chromium(III) complexes with organic compounds of a biopolymer

The effect of concentrations of chromium sulphate solutions on the structure of neutral dinuclear complex compounds, as well as on complex cations and dissociation products formed on dissolving the salt in water has been investigated. The inner sphere of the complex cations contains not only the water molecules and sulfo groups, but also hydroxo groups, appearing in the cation inner sphere as a result of the deprotonation of water molecules. It has been shown that even in a dilute solution of salt the hydrolysis degree does not exceed 21%. The pathway of basic chromium salt formation under the action of sodium hydroxide has been analyzed. The various pathways of the reaction proceeded in the presence of amino acids, using a solution of chromium(III) sulphate and a solution of basic chromium sulphate are presented. These reactions are accompanied by the release from the inner-sphere of either water molecules or sulfo group and the replacement of the released groups by amino acids. The structure of chromium(III) complex and the interaction schemes with organic compounds of collagen have been proposed.