Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2006, No.4
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Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2006, No.4
| 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 4, 2006
CONTENTS
INORGANIC CHEMISTRY
Klyndyuk A. I., Petrov G. S., Akimov A. I., Dalidovich S. V., Savitsky A. A.
Heat capacity, thermal expansion and electrical conductivity of Nd1-xTmxBa2Cu3O7-d cuprates solid solutions. pp. 5--9
Summary: Heat capacity, thermal expansion and electrical conductivity of Nd1-xTmxBa2Cu3O7-d solid solutions have been investigated at 300-1100 K. Anomalies of thermophysical properties of the cuprates attributed to a rearrangement of their oxygen sublattice were observed at 500-600 and 700-900 K. It was found that activation energy of electrical conductivity for Nd1-xTmxBa2Cu3O7-d increases monotonously with increasing d.
ANALYTICAL CHEMISTRY
Matveiko N. P., Tachilova T. L.
Cobalt determination by the cathodic stripping voltammetry method. pp. 10--13
Summary: A possibility of cobalt determination as a barely soluble compound, Co (OH)3, by cathodic stripping voltammetry using a AVA-1 analyzer with a pyrocarbon electrode has been investigated. Optimum parameters for the analysis have been found. A project of the method for cobalt determination in drinking and sewage waters has been developed on the basis of the data obtained.
Zhebentyaev A. I., Yorshik V. M.
Extraction of ion associates of sulfophthalein dyes with antiarrhythmic drugs. pp. 14--21
Summary: Optimal conditions for extraction of colored ion associates of antiarrhythmic drugs (moricizin, atenolol, metoprolol, amiodarone, verapamil, novocainamid) with sulfophthalein dyes (bromocresol red, bromophenol blue, bromocresol green, bromothymol blue) were found. The main chemical analytical properties of the associates were studied. The extraction constants for some associates were determined.
COLLOID CHEMISTRY
Komarov V. S., Seredyuk L. I., Rat'ko A. I.
Carbon preparation by template synthesis. pp. 22--26
Summary: The infuence of modifying salt solution on carbon porous structure in template low-temperature synthesis of carbon adsorbents on the basis of wood sawdust in the presence of activating additives, such as ZnCl2 or acetone, and freezing has been investigated. Positive effect of aforementioned additives to modifying solution on cellulose crystalline structure and development of carbon structural parameters has been shown. An increase of salt concentration in modifying solution was found to enhance sorption capacity and specifc surface of obtained carbon adsorbents. An explanation of the results is proposed.
Volnianko E. N.
Aggregate stability and electrophoretic behaviour of ultradispersed b-sialon hydrosols. pp. 27--30
Summary: Sedimentation and microelectrophoresis methods were applied to study aggregate and sedimentation stability of dispersed systems "hydrosoluion of surfactant - b-sialon". It has been found that the most stable system is "solution of cationic surfactant - b-sialon". Positively charged surface of b-sialon changes its sign in the aqueous media, the absolute value of x-potential decreases. It is shown that solvatation and electrostatics are the main stability factors of the dispersed system.
PHYSICAL CHEMISTRY
Azarko V. A., Kalechitz G. V., Agabekov V. E., Lysenko G. N., Mikhailovskii Yu. K.
Phototransformation of picric acid derivatives in thin film state. pp. 31--36
Summary: The possibility to form thin films from picric acid derivatives and monotherpene alcohols by vacuum thermal deposition has been investigated and optimum conditions have been found. The influence of substitute chemical structure on kinetics of photochemical transformations of picrates in the films has been studied. The estimated sum values of the direct and reverse reaction constants are in the range of (0.95--11.9) • 10-3 s-1.
Ivashkevich O. A., Kabo G. J., Blokhin A. V., Karpushenkava L. S., Antonova Z. A., Simirskij V. V., Maksimuk Yu. V.
Chemical exergy of rape biomass. pp. 37--40
Summary: The temperature dependencies of heat capacity for samples of seeds and straw of the rape in the range 80--370 K were measured. An isoperibol calorimeter equipped with a static bomb and an isothermal water jacket was used for measurements of the energies of combustion of the components of the rape biomass. The entropies at 80 K of the components were evaluated with the use of Kelly -- Parks -- Huffman extrapolation. Standard chemical exergies of straw and seeds of the rape were designed from the data obtained. It is shown that the gain of exergy makes ~ 170900 MJ/ga in one cycle of manufacture of the rape biomass that corresponds to ~ 4250 kg of diesel fuel.
Rabchinskii S. Ì., Strel'tzov Å. À.
Electrodeposition of atomic layers of cadmium on polycrystalline tellurium. pp. 41--45
Summary: The process of cadmium cathodic reduction from acid sulfate solutions (0.05 M CdSO4 + 0.1 M H2SO4) on polycrystalline Te-electrodes at more positive potentials than the equilibrium ECd2+/Cd0 potential (underpotential deposition -- UPD) has been investigated. Cadmium atomic layers generated by UPD interact with Te, diffuse into Te volume and form nanosized structures CdTenano. It results in changing from 2D structure to CdTe 3D nanostructures. CdTenano/Te heterostructure in contrast to Òå possesses photoelectrochemical activity -- generates cathodic photocurrent. Electrode sensibilization is connected with light absorbtion by CdTe which photoelectrons possess high reducing ability including Cd2+ cations reduction.
Yegiazarov Yu. G., Potapova L. L.
Infuence of support nature on efficiency of Fe-EDTA/anionite catalytic system in the reaction of hydrogen sulfide oxidation. pp. 46--49
Summary: Catalytic systems with Fe-EDTA complexes fixed on a fibrous anionite and an inert fibrous support have been obtained and tested in the reaction of hydrogen sulfide oxidation. Samples of the catalyst on the basis of anionite fibers were found to be more effective as a result of an increase of catalytic system stability due to inhibition of oxidative destruction of active complex by anionite's functional groups.
Ogorodnikov V. A., Soldatov V. S., Shunkevich A. A., Oboturov A. V.
Zinc sorption by monofunctional fibrous sulfocationite FIBAN K-1. pp. 50--55
Summary: Zinc ions sorption from aqueous solutions by sulfonic type fibrous cation-exchanger FIBAN K-1 has been investigated. The influences of pH, background electrolyte, solution temperature and packing density of the fibers on sorption dynamics have been studied. Dynamic characteristics of zinc sorption by ion-exchanger FIBAN K-1 were compared with those of fibrous carboxylic ion-exchanger FIBAN K-4 and granular sulfocationite ÊU-2×8.
Bildyukevich A. A., Kuvaeva Z. I.
Ultrafltration of cultural liquids containing L-threonine. pp. 56--60
Summary: Possible application of polyacrylonitrile ultrafltration membranes with different cut-offs for preliminary clearing of cultural liquids containing L-threonine has been investigated.
Bokshits Yu. V., Shevchenko G. P., Ponyavina A. N., Rakhmanov S. K.
Reduction of silver and copper iodide nanoparticles in aqueous solutions. pp. 61--66
The processes of Ag, Cu and Ag-Cu nanoparticles formation by reduction of respective iodide colloids have been studied. Depending on precursor solubility, the reduction was found to proceed through the solid phase (for AgI), through solution (for CuI) or by a mixed way (for AgI-CuI solid solution). Silver and copper nanoparticles were shown to form preferably upon reduction of AgI-CuI colloids; bimetallic Ag-Cu nanoparticles are less likely to form.
ORGANIC CHEMISTRY
Tarasevich V. A., Basalaeva L. I.
2-Naphtylamine in the synthesis of derivatives of sodium salt naphthalenyl-azo-naphthalene sulfonic acids. pp. 67--70
Summary: Sodium salt naphthalenyl-azo-naphthalene sulfonic acids were synthesized using 2-naphtylamine as an azocompound and as a diazocomponent.
Cherevin M. S., Gulevich T. G., Zubreichuk Z. P.,. Knizhnikov V. A.
Simultaneous preparation of mono- and bis-trifuoroacetyllysine. pp. 71--74
Summary: The possibility of simultaneous synthesis of mono- and bis-trifuoroacetyl derivatives of lysine by interaction of sodium salt of lysine with ethyltrifuoroacetate in ethanol medium has been shown. The influence of the reagents ratio on the yield of target products has been investigated.
Dikusar E. A., Potkin V. I., Kozlov N. G.
Synthesis of aromatic azomethynes on the basis of aminopropiophe-none and derivatives of vanillin and vanillal. pp. 75--81
Summary: New aromatic azomethynes containing keto, ether and ester groups were synthesized by interaction of vanillin, vanillal, and their esters with 4-aminophenylpropan-2-one in anhydrous methanol.
BIOORGANIC CHEMISTRY
Potapovich M. V., Eryomin A. N., Rubinov D. B., Metelitza D. I.
Effect of herbicide tralkoxydime on peroxidase activity in water-organic and reversed-micellar media. pp. 82--87
Summary: The tralkoxydime effect on catalytic activity of horseradish peroxidase has been studied in oxidation of tetramethylbenzidine (TMB) and o-phenylenediamine (PDA) in water-organic and reversed-micellar media. In buffered solutions containing 5--10% of DMFA, tralkoxydime activates the peroxidase-catalyzed oxidation of TMB and PDA. The activation has a non-competitive character in the case of PDA (1-5 mM of tralkoxydime), TMB (4--7 mM) and hydrogen peroxide (1--7 mM). At the TMB oxidation in the presence of 1--4 mM of tralkoxydime, the activation is of a mixed type. In buffered solutions in the presence of surfactants of different nature, the activating effect of tralkoxydime on TMB oxidation decreased. In the reversed micelles of Aerosol OT in heptane, tralkoxydime weakly effects the peroxidase-catalyzed oxidation of TMB and PDA.
Khripach N. B., Baranovsky A. V.
NMR spectral characteristics of steroid derivatives with different orientation of C-22 substituent in the side chain. pp. 88--93
Summary: Synthesis and detailed NMR investigation of several 22-hydroxysteroids with 22a- and 22b-orientation of hydroxyl group are described. It is shown that, for a pair of isomers, C-23 resonance of 22a-isomer in 13C NMR spectra appears at lower felds than one of 22b-isomer. The rule is valid for 22-monosubstituted and for a number of polysubstituted steroids and can be used for steroid side chain structure elucidation.
Navakovski M. J., Epshtein T. V., Dubovskaya L. V., Vashkevich I. I., Sviridov O. V.
Improvement of affinity chromatography isolation method and quality control of streptavidin. pp. 94--98
Summary: A modernized affinity chromatography-based process of streptavidin isolation from the culture liquids of Streptomyces avidinii has been proposed. The procedure includes separation of impurities insoluble at pH11 and adsorption of contaminates on amino-sepharose pre-column followed by biospecifc chromatography on 2-iminobiotin-sepharose column. The method results in ultra-pure biologically active streptavidin with a yield of about 94%. An affinity electroforesis procedure has been developed to evaluate quality of the final product.
TECHNICAL CHEMISTRY AND CHEMICAL TECHNOLOGY
Cherednichenko D. V., Vorob'eva E. V., Krut’ko N. P.
Potassium chloride particles interaction in the process of granulation. pp. 99--104
The character of potassium chloride particles interaction in the process of granulation depends on initial state of the powder (wetness, dispersity, hydrophobicity) and additive type. Regulating wetness and dispersity of potassium chloride particles, using composite polymeric and surfactant additives for hydrophobic powders allows to control water distribution in the mass and plastic resistibility of the powder, optimize the parameters of the granulation process, and increase its efficiency.
Stefanyuk I. V., Shkadretsova V. G,. Kuzmich V. V, Markevich U. G.
Optical and physical-chemical characteristics of heat-absorbing unprimed coatings on the basis of glasses of R2O--B2O3--Na3AlF6--RxOy--SiO2 system. pp. 105--108
Summary: The influence of CoO, FeO, NiO, CuO, MnO2 concentrations on physical-chemical and infrared optical properties of unprimed glass-enamel coatings has been investigated. The maximal absorption factor (93--95%) in the range of the solar spectrum is observed while 1% of oxide cobalt or mixed oxides of cobalt, nickel, iron are added to the base composition. High chemical stability and coupling durability of the coating retain.
Chernaya N. V., Emello G. G., Lamotkin A. I.
Features of coagulation of modified tall rosin hydrodispersion by cationic polyelectrolytes. pp. 109--112
Summary: The effect of some cationic polyelectrolytes on coagulation kinetics of modified colophony is higher than that of aluminum sulfate. Destabilization of colophony particles apparently occurs because of reducing particles charge in the presence of the polyelectrolytes and through particle agglomeration due to bridging with polymer macrocations. The strong polyelectolytes are found to be the most effective ones.
Zaitseva T. L., Zhukov V. K.
Characteristics of extractive substances from some peat-forming plants. pp. 113--115
Summary: The extractive substances from herb of Comarum Palustre L. and Menyanthes trifoliate L. and also from their leaves, stems, flowers, and roots were isolated by extraction with a water-ethanol solvent. The physico-chemical characteristics of these extracts are summarized. The output of extracts on the average is of 21.6% for Comarum Palustre L. and 27.6% for Menyanthes trifoliate L. It was shown that the extracts of investigated peat-forming plants contain high quantity of biologically active substances -- triterpenoids and unsaturated organic acids. The biggest quantity of these substances was found in extracts from herb and flower of Comarum Palustre L.
Dyakonov Î. Ì., Shevchuk V. V.
Thermal destruction of oil phase under heating of metal chips. pp. 116--121
Summary: The process of temperature conversion of inorganic and organic components of metal waste into solid and gaseous products has been studied. It has been shown that the thermal destruction of oil phase under heating proceeds according to complicated mechanism of consecutive reactions. These include polycondensation, polymerization and law packing with a constant decrease of hydrogen content and conclude with the formation of coke carbonic residue on the surface of metallic particles and air dredge of carbon fne particles (smoke).
SCIENTISTS OF BELARUS
Krut'ko N.P., Komarov V. S., Rat'ko A. I. et al.
Foma Fomich Mozheiko (To the 70th Anniversary). pp. 122--123
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