Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2009, No.3
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Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2009, No.3
| Proceedings of the National Academy of Sciences of Belarus
(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCESPublished by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Number 3, 2009
CONTENTS
INORGANIC CHEMISTRY
Drozdovich V. B., Kubrak P. B., Shimanski S. V., Zhdanok S. A., Zharski I. M.
Preparation and properties of electrocatalytically active sulfur-containing nickel galvanic coatings. pp. 5--9
Summary: Different nickel platings with heightened content of sulfur including composite platings with mechanically activated nickel and molybdenum powders have been obtained. Their composition, electrocatalytic and hydrogen sorption properties in alkaline electrolytes have been analyzed by electronic microscopy with energy dispersing chemical analysis and cyclic voltamperometry. The composition of thiocyanate electrolyte for nickel plating was optimized. Electrocatalysts with activity almost as good as for nickel surface skeletal catalysts were obtained. Nickel sulfur-containing platings can be used for restoring depreciated electrode pairs of alkaline electrolysers and combustion cells.
COLLOIDAL CHEMISTRY
Komarov V. S.
Special features of specific surface determination for adsorbents containing micropores. pp. 10--14
Summary: A new method for specific surface determination of the solid, containing micropores of comparable size with adsorbate molecules, has been discussed. The concept of "profile surface" of the molecule has been introduced, instead of "landing ground" of molecule in the monomolecular surface layer. Several changes are introduced into the design formula of the specific surface, as well as in the value of the monomolecular adsorption layer volume, determined by BET method. This has allowed to determine the specific surface of microporous adsorbents with high validity.
Komarov V. S., Leonenko L. I., Rat'ko A. I., Kostyuk S. A.
Effect of preparation conditions upon structure of coprecipitated manganese-zinc and chromium-nickel hydroxides. pp. 15--18
Summary: Problems associated with syntheses of porous materials from the binary salt systems with different hydroxide precipitation pH values, have been discussed. The mechanism of structure formation and its peculiarities depending on the source salt solution concentration and temperature of hydroxide precipitation have been considered. It has been supposed that the designed method for sample preparation can open the way not just for preparation of adsorbents, but also for making catalysts with even distribution of the active component both in volume and on the surface of samples.
Komarov V. S., Kostyuk S. A., Rat'ko A. I., Leonenko L. I.
Aluminium, iron and magnesium hydroxides' structure formation, depending upon drying condition. pp. 19--22
Summary: The effect of the drying temperature on properties of aluminium, magnesium and ferric hydroxides at 20, 40, 60 and 80 °C has been studied. It has been established that the sample sorption capacity increases with decrease of the surface tension of liquids. The mechanism of hydroxide structure formation and factors responsible for shaping of their porosity during the drying process have been discussed.
Matrunchik Yu. V., Vorobiova E. V., Basalyha I. I., Krut'ko N. P.
Rheological properties of polymeric hydrogel compositions based on polyacrylic acid and anionic surfactants. pp. 23--27
Summary: The relationship between rheological properties of the polymeric hydrogel (PHG) composition based on polyacrylic acid with anionic surfactant (sodium oleate), surfactant concentration and temperature has been studied. Rheological properties of individual components and the composition have been investigated. It has been shown that viscosity of the composition is almost 10 times higher than PHG viscosity and more than 100 times higher than surfactant solution viscosity. It has been speculated that the structure is formed due to hydrophobic interactions of surfactant micelles with non-polar segments of the hydrogel spatial grid.
ANALYTICAL CHEMISTRY
Rakhman'ko E. M., Markovskaya M. S., Stanishevsky L. S., Zubenko Yu. S., Tsyganov A. P.
Quaternary ammonium salt cation size influence on the nitrate-anion exchange to the chloride-anion. pp. 28--32
Summary: A number of 3,4,5-tris-dodecyloxybenzene radical containing QAS was synthesized. The lgKNO-3Cl- dependence of 3,4,5-tris-dodecyloxybenzene-tris-alkylammonium salt alkyl radical length was studied. It was revealed that 3,4,5-tris-dodecyloxybenzene-tris-dodecylammonium nitrate application can increase the NO-3-selective electrode selectivity to Cr-ions.
PHYSICAL CHEMISTRY
Hilevskaya K. S., Masalova O. A., Shutava T. G., Agabekov V. E.
Mono and multilayer coatings based on polysaccharides and protamine sulfate. pp. 33--38
Summary: The rate constants of protamine sulfate, dextran sulfate, and alginic acid adsorption on an oppositely charged polymer sublayer and thicknesses of the layers formed by these biopolymers were evaluated by the quartz crystal microbalance method in solution. It has been shown that surface morphology and structure of multilayer coatings on the basis of the natural polysaccharides and protamine sulfate formed by the layer-by-layer method and consisting of up to 10 protamine/polysaccharide bilayers are affected by the solution pH value.
Potapovich M. V., Grigorenko Yu. A., Metelitza D. I., Shadyro O. I.
Kinetics of aromatic amines' and substituted phenols' co-oxidation in "pseudoperoxidase" systems. pp. 39--48
Summary: The comparative study on inhibited oxidation of tetramethylbenzidine (TMB) and o-phenylenediamine (PDA) in the methemalbumin-H2O2 system at 20 °C in the buffered physiological solution at pH 7.4 has been performed on five substituted aminophenols (AP) and two methylphenol cycloderivatives (analogs of a-tocopherol). All the seven compounds inhibited the TMB oxidation by non-competitive or competative mechanism and the PDA oxidation -- by mixed type mechanism, to a varied degree. The inhibitors have been quantitatively characterized by inhibition constants Ki. In TMB oxidation, these constants varied from 9 to 72 µM, and in PDA oxidation -- from 42.5 to 153 µM. On the basis of Ki values and other properties, two TMB-AP and PDA-AP pairs have been selected for practical use in test systems for total antioxidant activity of human biological fluids.
Bokshits Yu. V., Petrovskaya N. N., Osipovich N P., Shevchenko G. P., Rakhmanov S. K.
Contact deposition of silver on copper nanoparticles in aqueous solution. pp. 49--53
Summary: The possibility for the formation of Cu--Ag bimetallic nanoparticles with core (Cu) -- shell (Ag) structure in the contact deposition reaction has been demonstrated by methods of optical spectroscopy, electron microscopy and voltammetry. It has been found that these structures can be formed when the molar ratio Cu0/Ag+ is much more than 1.
Kuvaeva Z. I., Ahabalajeu A. A.
Interphase distribution of 4,6-substituted 2-desoxystreptamines between water phase and dinonylnaphthalenesulfonic acid octane solution. pp. 54--58
Summary: Interphase distribution of 4,2-substituted 2-desoxystreptamines between water phase and dinonilnaphthalenesulfonic acid octane solution has been studied, using tobramicin and apramicin as model compounds. Coefficients of distribution between water phase and dinonilnaphthalenesulfonic acid octane solution have been calculated for both antibiotics. It has been shown that antibiotic's selectivity increases with increase of its equivalent part in the extractant phase. Water sorption by solutions of dinonilnaphthalenesulfonic acid with varied antibiotic concentration has been studied.
Khaminets S. G., Potapova L. L., Yegiazarov Yu. G.
Activity of Au-containing catalysts on carbon fiber support in carbon monoxide CO oxydation. pp. 59--63
Summary: A series of gold-containing catalysts on the basis of "carbopon", a fibrous carbon material modified with iron oxide, has been prepared. Obtained catalysts have been tested in the reaction of CO oxidation. It has been concluded from the results and literature data analysis, that fibrous carbon materials, even if modified with promotors, are not suitable for making efficient gold-containing catalysts for CO oxidation.
ORGANIC CHEMISTRY
Tarasevich V. A., Agabekov V. E., Fam Hong Hai, Fam Kyok Long
Biocides from guanidine derivatives. pp. 64--71
Summary: A survey of data on chemical biocides used for bioprotection of various materials, industrial, technological and medical objects is presented. Experimental results on antibacterial activity of compositions containing previously prepared polyhexa-methylene guanidines obtained from bacterial strains prevailing in recirculated water of YSC "Atlant", are discussed.
Litvinovskaya R. P., Raiman M. E., Khripach V. A.
Synthesis of 6-o-alkyloxime derivatives of 28-homo-brassinosteroids. pp. 72--78
Summary: Several substituted steroid oximes with terminal carboxylic and ester groups have been synthesized from a 6-O-alkyloxi-me derivative of 28-homocastasterone. New brassinosteroid 6-(O-carboxymethyl)oximes have been prepared also from 23-acetoxy-22-oxo-28-homocastasterone by the regeoselective reaction with O-carboxymethylhydroxylamine hydrochloride.
Khlebnikova T. S., Isakova V. G., Lakhvich F. A.
Indazolones from fluorinated 2-benzoylcyclohexane-1,3-diones. pp. 79--83
Summary: Fluorine-containing 2-benzoylcyclohexane-1,3-diones and their enol methyl ethers react regioselectively with N,N-dinucleophiles, such as phenyl hydrazine, 4-fluorophenyl hydrazine hydrochloride or pentafluorophenyl hydrazine, to give regioisomeric fluorinated 6,7-dihydro-1H-indazol-4(5H)-ones and 6,7-dihydro-2H-indazol-4(5H)-ones, respectively.
Stasevich O. V., Mikhalyonok S. G., Kurchenko V. P.
Preparation and chemical modification of secoisolariciresinol diglucoside lignane. pp. 84--87
Summary: Lignan secoisolariciresinol diglucoside has been isolated from flaxseed with 95% purity. It has been then converted to secoisolariciresinol and then to its diacetic ester acylated by phenolic hydroxy groups. Structures of obtained compounds have been confirmed by NMR 1H, 13C, IR and mass spectrometry.
BIOORGANIC CHEMISTRY
Sivets G. G., Kulikovsky A. I., Kalinichenko E. N.
Synthesis of L-thymidine from L-carbohydrate precursors. pp. 88--94
Summary: Two approaches to L-thymidine have been studied: from L-arabinose and peracylated derivative of L-ribose. The target L-nucleoside has been prepared as a mixture of b/a-anomers or the pure b-anomer via methyl 2-deoxy-3,5-di-O-p-toluoyl-a-L-erythro-pentofuranoside or l-(b-L-ribofuranosyl)thymine, respectively.
Arsenov D. V., Babitskaya S. V., Kisel M. A.
Synthesis of amphiphylic polyunsaturated fatty acids derivatives as effectors of antitumor doxorubicin action. pp. 95--100
Summary: An efficient approach to the synthesis of polyunsaturated fatty acids amides with O-phosphoethanolamine and O-phospho-L-tyrosine, based on the direct acylation of O-phosphoethanolamine and O-phospho-L-tyrosine with polyunsaturated fatty acids' mixed anhydrides, has been developed.
POLYMER CHEMISTRY
Nabiullin A. R., Shmanay V. V.
Functionalization of polyester fiber with aldehyde groups for protein immobilization. pp. 101--104
Summary: A simple two-step method for polyester fiber functionalization with aldehyde groups has been developed. The method includes partial polyester hydrazinolysis, followed by treatment with glutaraldehyde. It has been found that active aldehyde group content in the material obtained was 8.5 µmol/g, immobilization capacity (by albumin) was up to 1.1 µg/g.
GEOCHEMISTRY
Sokolik G. A., Ovsiannikova S. V., Voinikava K. V., Papenia M. V.
Uranium and radium radionuclides in soil-plant complex of Belarus natural ecosystems. pp. 105--112
Summary: The contents of natural uranium and radium radionuclides in the conjugated samples of soil and grass vegetation as well as in the pore soil solutions of the plant root nutrition area of Belarus natural ecosystems have been determined. The migration parameters of these radionuclides in the soil -- plant system for the different types of soil and various grass species of natural ecosystems have been established. It has been shown that the Bryophyta and lichen are characterized by higher accumulation of the natural uranium and radium radionuclides in comparison with the other grass species growing on the similar type of soil. An increase in the hydromorphity and acidity of the soil medium, as well as the proportion of uranium and radium in the soil solution of the root nutrition area intensifies the radionuclide soil-plant migration.
TECHNICAL CHEMISTRY AND CHEMICAL TECHNOLOGY
Bambalov N. N., Zinkalova L. Yu.
Changes of nitrogen content in lignin during peat formation process. pp. 113--118
Summary: Lignin of peat forming plants accumulates nitrogen in the course of peat formation process due to interaction of its functional groups with amino acids, ammonia or the fragments of proteins. About 20--45% of nitrogen in lignin, extracted from humified materials, is contained in the form of amino acids, and about 55--80% -- in the form of non-identified nitrogen compounds.
Kuzmenkova N. M.
Influence of the thermal history on phase transitions in the series burden - melt - glass -glass-ceramic material. pp. 119--122
Summary: The heredity of phase composition for the glass-ceramic material, obtained in K2O--Li2O--Al2O3--SiO2 system, depending on the thermal history (burden heat treatment conditions, glass and glass-ceramic material cooling conditions) has been determined.
Sokolov G. A., Konstantinova A. D., Smirnova V. V.
Changing molecular mass distribution of humic acids by hydrodynamic cavitation of peat suspension. pp. 123--124
Summary: It has been determined that, during hydrodynamic cavitation of peat, not only physical destruction of peat particles occurs, but conditions for formation of high-polymeric fraction of humic acids are created.
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