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0216U003527,
0113U001530
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Polyoxometalates of elements of V and VI groups in solutions, solid phase and medical compositions with hydroxyapatite
Rozantsev Georgy Mihailovich, Доктор хімічних наук
29-01-2016
Donetsk National University
The phase formation processes of isopolytungstates in the systems Со2+ WO42 H+ DMF H2O (DMF - dimethylformamide) with different acidities (Z = ?(H+)/?(WO42 ) = 1.14-1.60) have been studied. It was found that only cobalt (II) hepta-, para- and decatungstates can be isolated from aqueous dimethylformamide solutions. The chemical and FTIR spectroscopic analysis of the products isolated from the system allowed the determination of conditions of Co (II) decatungstate formation. Synthesized novel cobalt (II) decatungstate, [Co(C3H7NO)5]2[W10O32], was characterized by elemental and EDX spectral analysis, SEM, FTIR spectroscopy, thermal analysis, single-crystal X-ray diffraction, and by UV-Vis. spectroscopy analysis. The formation and transformation processes of isopoly tungstates in the system Na2WO4 - HCl - NaCl - DMF - H2O with different DMF concentration have been studied by means of single-point pH-potentiometric titration and the subsequent modeling of the equilibria processes. The modeling of equilibria processes resulted in data necessary to synthesize a novel barium decatungstate, [Ba(H2O)2(C3H7NO)3]2[W10O32]?(C3H7NO)2. Synthesized salt was characterized by elemental and EDX spectral analysis, SEM, FTIR spectroscopy, thermal analysis, single-crystal X-ray diffraction analysis in solid state, and by UV-Vis. spectroscopy in solution. Conditions necessary for the formation of sodium heteropoly hexamolybdonickelate (II) Na4[Ni(OH)6Мо6O18]?16H2O (I) in Ni(NO3)2 ? Na2МоO4 ? HNO3 ? H2O solution, acidified up to Z = ?(H+)/?(МоO42-) = 1,00, were established. The synthesized salt (I) was examined using chemical analysis, X-ray single crystal analysis and XRPA, thermal analysis and FTIR spectroscopy. It was shown that the heteropoly anion belonged to the Anderson type of structure. X-ray single crystal analysis of (I) revealed the following results: triclinic, , a = 8,0586(4) ?, b = 10,5445(6) ?, c = 12,1374(5) ?, ? = 69,557(5)°, ? = 70,604(4)°, ? = 84,123(4)°, V = 911,45(8) ?3, and its isostructurality with Na4[Ni(OH)6W6O18]?16H2O was established. The procedures of synthesis of silicon-substituted hydroxyapatite Si - HA containing 1.4-4.3 wt. % Si were elaborated. The chemical and phase composition of silicon-substituted apatite described formula Ca10[(PO4)6-x(SiO4)x](OH)2-x, where x = 0.5; 1.0 and 1.5 (1.41 and 4.32 wt.% Si, respectively) was investigated by EDX spectral analysis, XRD phase analysis, and infrared spectroscopy.
Гумерова Надія Ісмагілівна
Пойманова Олена Юріївна
Радіо Сергій Вікторович
Усачов Олег Михайович
2020-04-02
Updated: 2025-12-08
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