Contents of Volume 81 №6 (2015)

Summary: Thick films of stabilized dioxide zirconium, stabilized by complex scandium-, yttrium-, cerium-, iron dopants were synthesized by tape casting method. Scandium–containing films are characterized by a sufficiently high ionic conductivity, low electronic conductivity, and can be used as solid electrolytes for low temperature (600 °C) fuel cells.

Summary: Acid-basic properties of inorganic compounds of zirconium and hafnium and their conformity to position in Periodic system of elements are discussed. On the basis of the offered parameter of basicity the conclusion about greater basicities of zirconium oxide and fluoride in comparison with similar compounds of hafnium is made that is a consequence of lanthanide compression among 4f-elements. This conclusion is confirmed by the analysis of relative durability of complex oxides of zirconium and hafnium in which ZrO₂ and HfO₂ play a role as basic (systems Zr(Hf)O₂—MO₂ (M – Ge,Ti)—P₂O₅), and acid (systemsMg(Ca)O—Ln₂O₃ —Zr(Hf)O₂) oxides. It is noticed that distinctions of acid (basic) properties of hydroxides of the specified metals are expressed much more weakly, than at corresponding oxides.

Summary: Optimal methods of synthesis homoand heterometallic tartratogermanates different structural types have been developed by varying initial reagents: GeO₂ and GeCl₄, solvent, temperature, ratio of Ge: ligand : second metal, reaction time. It was found that the basis of their structure constitute dimer fragments [Ge₂(μ-Tart)₂] with octahedral or trigonal-bipyramidal polyhedron completely deprotonated ligand, which depending on the synthesis conditions can be combined in the polymer chains and nets by bridging hydroxo- or oxogroups, and also by bridge deprotonated ligand Tart^4–.

Summary: А simple and reliable method of microextraction preconcentration from water solutions and following gas chromatographic determination of acetylderivatives of methyl-, ethyl-, propylparabens has been developed. The enrichment factors and extraction recoveries were obtained in the range of 260—270 and 96 —100 % respectively. Limit of detection for methylparaben was 0.016, for ethylparaben was 0.015, for propylparaben was 0.013mg/l. Reproducibility was acceptable with relative standard deviation up to 7.8 %.

Summary: To study the effect of oxygen on the character of the EPR spectra samples obtained from Donetsk anthracite, heat-treated at different temperatures (375, 875 °С) different reagents—water vapor, argon, air and in vacuum have been synthesized. The effect of oxygen on the sorbents and the dependence of EPR spectra parameters of the oxygen concentration has been investigated. The estimation of the suitability of anthracite as an oxygen sensor has been done.

Summary: The mineralogical, elemental and oxide composition of blast furnace slags of Ukrainian metallurgical plants was determined. The peculiarities of surface morphology of slag particles were studied. The high slag hydraulicity by module system and by content of minerals with high hydraulic activity was shown. The criteria of practical utilization of technogenic materials in binder’s materials production were substantiated. They are: the absence of toxic elements, presence of minerals with high hydraulic activity and substances’ amorphous state, the necessary ratio of main elemental oxides. The slags’ fractions were recommended to utilize in raw mixture composition for Portland cement clinker production instead of clayey component and in slag Portland cement production.

Summary: The synthetic method to obtain new benzotriazole and benzimidazole derivatives containing at the nitrogen atom bulky fluorinated groups (–C(CF₃)₂H and –C(CF₃)₂OR) was developed based on available o-nitrophenylimine of hexafluoroacetone.

Summary: A series of the new functionalized unsaturated 1-phenyl-3,5-dimethylpyrazole derivatives via cross-metathesis reactions between 4-allyl-1-phenyl-3,5-dimethylpyrazole and various functionalized olefins was synthesized for the first time. These transformations were carried out using ruthenium containing Grubbs-Hoveyda catalyst. According to prognosis of biological activity via Prediction of Activity Spectra for Substances program cross-metathesis products obtained may be antiinflammatory, insulysin inhibitor, 5-O-(4-coumaroyl)- D-quinate 3’-monooxygenase inhibitor, CYP2J substrate, HMGCS2 expression enhancer.

Summary: Chemical structure of a number of industrial surface-active substances (surfactants, SA) used as stabilizers of high internal phase emulsions (HIPEs) for template synthesis of polyHIPEs, whose skeleton is formed by polystyrene/polycyanurate (PS/PCN) interpenetrating polymer networks (IPNs) has been simulated on the base of the results of FTIR and 1H-NMR spectroscopy measurements. In this paper the HIPEs of styrene (S)/dimethacrylate of triethylene glycol (DMATEG)/ dicyanate ester of bisphenol E (DCBE) were stabilized by the mixtures of SA1/SA2, where as SA1 Hypermer 2296 was chosen and as SA2 Hypermer V246SF, Hypermer B246E, Hypermer A60, Hypermer 1083, Span 40, Span 60 and Span 80 were tested. Using SEM, DSC, TGA techniques and the results of mechanical testing, the best combination of properties, namely, a porous structure, thermal and thermo-oxidative stability, thermal behavior and mechanical strength have been found for P(S-DMATEG)/PCN polyHIPEs synthesized in the presence of a pairs Hypermer 2296/Hypermer B246E and Hypermer 2296/Hypermer A60.