(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
| Proceedings of the National Academy of Sciences of Belarus (Vestsi Natsiyanalnai Akademii Navuk Belarusi) SERIES OF CHEMICAL SCIENCES Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Summary: Single phase solid solutions of compound Bi2Ca3-xSrxCo2Oy (x < 2) have been synthesized by a solid state reaction in air. These solid solutions have been revealed to be not superconductive. They have a metal type conductivity in a temperature range from 80 to 800 K and that of a semiconductor type below 83 K. Individual compound Bi2Sr2Co1Oy has been synthesized by a solid state reaction. It has been established that it is impossible to replace strontium by calcium.
Komarov V. S., Repina N. S., Kosobutskaya N. F., Luneva N. K., Rekashova N. I.
Structure and ion-exchanging of phosphates and molybdate of zirconium, titanium and hafnium modified by hydroxides. pp. 12--16
Summary: Structural and ion-exchanging properties of phosphates and manganates of zirconium, titanium and hafnium structured by iron and aluminium hydroxides have been studied. A curve of Vs -- composition of coprecipitated samples produced from bi- and three-component systems has been shown to have a maximum. Analogous dependence has been obtained for ion-exchanging capacity. Ion-exchanging capacity has been established to increase due to inner surface development which enhances an accessibility of ion-exchanging sites.
Summary: Values of thermodynamic properties of butyne-1 and butyne-2, pentyne-1 and pentyne-2, hexyne-2 and hexyne-3, heptyne-2, 4,4-dimethylpentyne-2 and cyclopropylacetylene have been calculated under idal gas conditions. A simple additive scheme has been elaborated to calculate an enthalpy of acetylene hydrocarbons formation (gas; 298.15 K). The values of enthalpy of formation of isomeric hexynes and heptynes have been calculated based on additivity rule.
Senkov G. M., Gorbatsevich M. F., Nikitina A. M.
Effect of ferrum ions on a catalytic activity of alumoplatinum catalyst modified by chromium pp. 27--29
Summary: An effect of ferrum ions on the catalytical properties of 0.4%Pt + 0.6%Cr + Fe catalyst has been investigated in n-octane conversion. Ferrum ions have been shown to change acidic properties of catalyst carrier surface as well as electron state of Pt sites of a contact.
Stepanova E. A., Ratko A. I., Bolotnikova E. V., Vecher V. A., Chistova T. A.
A change of physical-chemical properties of carbonate tripolies under thermal activation. pp. 30--35
Summary: Regularities of changing of mineral composition, adsorption-structural and acidic properties of the carbonate tripolies of Belarus depending on their thermal activation in an air and in vacuum have been established. The samples have been shown to possess a high sorption capacity, Lewis acidity and thermal stability under heating in a temperature range from 200 to 700 °C.
Summary: Literature data on synthesis of niobium and titanium compounds containing s-bonded a-thienyl groups and their application for preparation niobocene and titanocene organic derivatives have been summarized.
Summary: A long-term investigation based on 2,3-acylcyclohexan-1,3-diones and their precursors resulted in preparation of synthetic feromones for a number of specific moths harmful to fruit trees, such as Gelechia rhombella Shiff., Callisto denticulella Th., Lithocolletis corylifoliella HW., Nepticula malella Stt., Coleophora nigricella Steph. The compounds prepared are promising for application in agriculture for moth monitoring as well as for moth control by male elimination.
Litvinko N. M., Kuchuro S. V., Lis L. G., Zheldakova T. A., Filich E. P.
Effect of phospholipase A2 preincubation with 9,10,11-methyl analogous of prostaglandi on lipolysis. pp. 59--70
Summary: Egg yolk phospholipids hydrolysis by Naja naja oxiana and Vipera russelli snakes venom phospholipase A2(PL A2) was studied. The method of diffusion of the enzyme in lecithin --agarose gel after preincubation with hydrophobic substances was used. Natural PG E2, PG F2a and 22 synthetic 9,10,11-methyl of analogous PG based on cyclopenthanon and cyclopenthenon were used as hydrophobic agents. Last group included ethylene-, acetylene-, isoxazole- and isoxazoline-contained derivatives. Inhibition of PL A2 activity after preincubation with almost all agents were observed.
Summary: Behaviour of K-40, Ra-226, Th-232 and Sr-90, Cs-137 in buried geochemical barriers are examined. Some sides of the barrier geochemical structure dealt with syngenetic and epigenetic processes have been taken into consideration.
Summary: A method for a modified terpenoid maleic resin (ITMR) preparation by TMR treatment with ethanolamine at 170±2 °C has been developed. The ITMP possesses a number of useful properties such as electroinsulatoric, antiseptic and anticorrosion ones. Thermal oxidative destruction of ITMR in a temperature range from 180 to 200 °C has been studied by dynamic and isothermal gravimetry.
Dite M. V., Bambalov N. N.
Coagulation thesholds of humic acids isolated from a cotton grass peat by different extractants. pp. 83--84
Summary: Coagulation thresholds of humic acids isolated from a cotton grass peat with extractants of different pH values. It has been shown that in peat humic acids there are fractions coagulating at CaCl2 concentrations from 3 to 80 mg-eq/l.
Belyavskii K. M., Kasperchik V. P., Karpovich N. V., Podruchnaya A. G., Ivlicheva A. M., Movchanskii M. A., Zharkevich L. V., Logunova A. V.
Preparation of a complex of aminoacids and low molecular peptides of a fodder purpose from waste of leather processing. pp. 85--89
Summary: Preparation and properties of a complex of aminoacids and low molecular peptides of a fodder purpose from waste of leather processing are described. The initial solution can be concentrated on membranes with additionally modified surface up to 30--35% of dry substances.
Viryasov G. P., Ivanova L. A., Kukharchik V. V., Parmon S. V
Dependence of a chemical component composition of lipids of organic sapropels on extractant properties. pp. 90--94
Summary: Polar extractants (isopropanol, chloroform-ethanol (1:1)) permit a lipid yield to be increased by 1.5 -- 2 times as compared to nonpolar ones (benzene C2-80/120) due to isolation of oxidized sapropel components of a nonlipid nature. Chemical composition of lipids extracted from organic sapropels by benzene C2-80/120 is similar to a peat wax. But these lipids are characterized by a higher content of saturated long-chain nonbranched compounds of a normal structure mainly, such as n-hydrocarbons, esters, alcohols, acids, ketones.
Revyako M. M., Markina A. Ya., Gorshcharik N. D.
Preparation technology and properties of materials based on wastes of dimethyltherephthalate production. pp. 95--98
Summary: New material based on alkylphenolamine resins and wastes of dimethyltherephthalate production have been prepared and investigated. These materials possess a complex of unique properties and are promising for using in optical industry as polishing and sticking resins.
Geller B. E., Shcherbina L.A., Chirtulov V. G.
Kinetics of dinitrile of azodiisobutyric acid thermal decomposition in aprotonic and hydrotopic solvents. pp. 99--105
Summary: Kinetics of 2,2'-azobis(2-methylpropanenitrile) (ABMPN) thermal decomposition has been studied in dimethylformamide (DMF) and 51.5% (wt) aqueous solution of sodium rhodanate (ASSR). Initial rate constants of thermal decomposition, kd have been determined at 70 -- 90 °C, kd in ASSR being higher as compared to that in DMF. This fact is due to a specificity of a complexation of ABMPN and fragments of its decomposition with solvent molecules.
Vasyuk M. G., Zharskii I. M., Ivanova N. P.
Electrodeposition of zinc coatings in impuls mode of electrolysis. pp. 106--109
Summary: Pulsing current with a density of 1800 -- 2000 A/dm2 permits to accelerate substantially deposition process of corrosion resistance zinc coatings in alkaline electrolyte without brightener.
Summary: A monomolecular adsorption of mercury (II) traces from aqueous solutions on surfaceactive centers of polyurethane foam modified by 2-mercaptoethanol is acompanied by a chemosorption of the metal ions on an inner surface of the polymer micropores and occurs practically with a quantitative yield.
Lakhvich F.A., Lishtvan I.I., Soldatov V.S. et al.
Vladimir Semyonovich Komarov (To the 75-th Anniversary) pp. 122--124
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