PHYSICO-CHEMICAL STUDY OF THE PROCESSES OF ISOPOLIVANADATE FORMATION IN AQUEOUS-ORGANIC MEDIUM

Based on the results of modeling the processes of complexation of isopolyvanadate anions in Na3VO4 (C=0.01; 0.1 mol/L) – HCl – NaCl – C3H7NO (CH3CN) – H2O systems at 25.0 ± 0.1 S, polycondensation reactions in aqueous dimethylformamide (C3H7NO) and aqueous acetonitrile (CH3CN) solutions of sodium orthovanadate were studied; diagrams of the distribution of dominant isopolyanions depending on the acidity and nature of the medium are proposed; it is found that it is more expedient to use solutions with a concentration of C(VO43--) > 0.1 mol/l and an organic solvent content of 20–30 vol.% for the synthesis of salts. Data from chemical, X–ray phase, IR spectroscopic are synthesized and characterized composition [N(C2H5)4]6V10O28·4H2O·4C3H7NO; [N(C2H5)4]4V4O12 ·4 H2O ·2C3H7NO; [N(C2H5)4]5V3O10 ·4 H2O ·C3H7NО; [N(C2H5)4]6 V10O28· 3H2O ·7CH3СN.