firm-contaction-selective electrode
for definition of ions of aluminum
O.V. Vinogradov, S.S. Ryasenskii, N.V. Baranova
TverStateUniversity, Tver
Department of Inorganic and Analytical Chemistry
The firm-contact ion-selective electrode with a response to an aluminum ion is developed and made. For stabilization of potential the iono-electronic transdyuser on the basis of polyaniline is used. Possibility of practical use of the made electrode is shown.
Keywords:ion-selective electrode, electropro-water polymer, polyaniline.
Complexation processes in systems THAT contain manganese ions (II), high-molecular heparin and proline.
T.V. Kryukov, M.A. Feofanova, M.I. Skobin, N.V. Baranova, M.V.Minina
TverStateUniversity
Department of Inorganic and Analytical Chemistry
Using mathematical modeling of the experimental data such as pH-titration in physionlogical environment (t = 37° C; background electrolyte 0.15 M NaCl). Chemical equilibriums are investigated in multicomponent system Mn (II) - heparin - proline. Significance of complex forms is determined; values of the logarithms of the formation constants of complex forms are calculated.
Keywords: heparin, proline, complex, manganese ion (II)
INFLUENCE ON VEGETABLE ORGANISMS OF COMPLEXES
OF BORON WITH COMPLEXONES, DERIVATIVES
OF SUCCINIC ACID
T.I. Smirnova1, E.D. Malakhayev1, V.M. Nikolskiy2, L.N. Tolkacheva2, I.N. Baranovskiy1, T.V. Mikhaylovskaya2
1Tver state agricultural academy
Department of Agricultural Chemistry, Soil Science and Agroecology
2Tver state university
Department of Inorganic and Analytical Chemistry
The boron is absorbed by plants in the form of borat-anions which can be present at the soil in a look the chelates of complexes, for example, with ecologically safe ligands - complexones, derivatives of succinic acid. Nature of influence the boron complexes on a chemical composition of plants is established. By results of experiment the conclusion about higher biological activity of a boron complex in comparison with in-coordinate boron was made.
Keywords: boron, plants, complexones, derivatives of succinic acid.
CAPILLARY-MEMBRANE DRAINAGES AND THEIR STABILITY IN WATER ENVIRONMENTS
I.P. Storozhuk1, G.E. Bordina2, N.P. Lopina2, R.N. Chirkov3,
V.V. Artamonov3
1Institute of Organoelement Compounds named after A.N. Nesmeyanov
RussianAcademy of Sciences
TverStateMedicalAcademy
2Department of Chemistry
3Department of Surgery with the course optional Oncology
Designs of new types of the capillary-membrane drainages (CMD) are developed and research of their stability in water environments (water, physiological solutions) is conducted. Designs were carried out from acetate-cellulose membranes with a strengthening substrate on the basis of a nonwoven polyester fabric by means of BF-6 glue and the metal probes covered with a ftoroplast film.
Keywords: capillary-membrane drainage, strengthening substrate, draining, acetate-cellulose membrane.
RECEIVING THE MAGNETIC POLYMERIC COMPOSITE ON THE BASIS OF STRONTIUM FERRITE
N.V. Verolainen, A.Yu. Kopnina,L. I. Voronchikhina
Tver state universary
Chare of organic chemistry
Results of the researches directed on creation of heat-resistant polymeric material with magnetoelectric and effective physical and chemical properties are presented. The received composite material of optimum structure on the basis of siloksanovy polymer and ferrite of the strontium modified by means of surface-active substances possesses high strength characteristics and the magnetooperated properties.
KW: strontium ferrite, lestosil, composite material, stabilization, anion surface-active substances, sedimentatsionny stability.
SYNTHESISDERIVATIVES OF TRIETHYLAMINE IONIC LIQUIDSANDSTUDY OF THEIRTHERMAL PROPERTIES
O.I.Postnova, I.A.Presnyakov,O.E.Zhuravlev,
L.I.Voronchihina
TverStateUniversity
Chare of organic chemistry
Synthesizedionic liquids-tetrafluoroboratesandhexafluorophosphatealkiltrietilammoniyaandstudiedtheirthermal stability. A comparative analysis ofthe thermal stability of tetrafluoroborates and hexafluorophosphatewith halidesalkiltrietilammonium.
Keywords:ionicliquid, quaternary ammonium salts, tetrafluoroborateshexafluorophosphate.
ACID ESTERS AS A BASIS FTALILGLITSINA
SYNTHETIC LUBRICANTS
L.I. Voronchikhina, O.E. Zhuravlev, N.I. Krotova, I.A. Presnyakov,
E.V. Andrianov
TverStateUniversity
Chare of organic chemistry
Synthesized acid esters of ftalilglitsina based on individual higher alcohols, their technical and ethoxylated alcohols factions for their research as the basis of mineral oils in the composition of textile auxiliaries. The thermal stability of the air, freeze point, flash point, burning point and the dynamic viscosity. It is shown that the esters of higher alcohols and synthanol DS-10 on the complex properties of superior industrial petroleum oils and can be recommended for use as a mineral oil based.
Keywords: acid esters, oil-soluble surfactant, a thermally stable grease phthalates.
FEATURES OF THE SPECTRAL TRANSMISSION OF GERMANIUM SINGLE CRYSTALS IN A SPECTRAL RANGE 1000-520 СM-1
M.Yu. Ghavalyan, I.A. Kaplunov
TverStateUniversity,
In this study we investigated the optical properties of pure and doped germanium single crystals in the spectral range 1000-520 cm-1. there was shown the effect of dopants and oxygen presence in Germany on the position and shape of the phonon absorption peaks.
Keywords: Single crystals, germanium, isotopes, doped crystals, electroactive impurities, electrically neutral impurities, infrared optics, spectral transmittance, spectrum of phonon absorption.
STUDY OF ELECTRONIC STRUCTURE OF SIMLE EPHIRS IN FRAMEWORK «QUANTUM THEORY OF ATOMS IN MOLECULE»
E. M. Chernova1, V. V. Turovtsev1.2, Yu. D. Orlov1
1Tver state university
2Tver state medical academy
The equilibrium structure and the distribution of electronic density alkyl ethers found by DFT method B3LYP/6-311++G(3df,3pd) were studied in the framework of the “quantum theory of atoms in a mole-cules" (QTAIM). Range of the inductive effect was defined and highlighted the effect of the shielding of the group O.
Keywords: quantum theory of atoms in molecule, electron density, inductive effect, charges at atoms, spin density, QSPR, ethers.
QUANTUM CHEMICALSTUDYING OFRADICALS THIOCARBOXYLIC ACIDS
N.P. Rusakova1, V.A.Kotomkin1, V.V. Turovtsev2, Yu.D. Orlov1
1TverStateUniversity
2TverState Medical Academy
Theradical oftiobutaneacid С3H7C(O)S● was studied. The electron structures ofconformersof the seriesCnH2n+1–C(O)S●,where 1≤ n ≤10, were examinedin theframework of the "quantum theory of atoms in molecules" (QTAIM). The qualitative scaleelectronegativityof functional groupsχ(R) CnH2n+1–C(O)S● was compiled.The data are comparedwith the previously seriesstudiedCH3–(CH2)n–C(O)SHandCH3–(CH2)n–C(S)OH,wheren ≤9, andbuiltan extendedrangeχ(R).
Keywords: electron density, electronegativity, conformational analysis, internal rotation, inductive effect, stericeffect.
The study of the processes of change at the stoichiometric composition of electrochemical deposition and dissolution of manganese (IV)
E.B. Godunov, I. V. Artamonova, T.V. Martynova, A.N. Shirocova
MoscowState of Mechanical Engineering
The processes of change in the stoichiometric composition occurring during the electrochemical deposition and dissolution of manganese(IV) on a platinum electrode from sulfuric acid solutions of manganese sulfate(II). Calculated electrochemical parameters of these processes to reflect changes in the stoichiometric composition.
Keywords: the stoichiometric composition, manganese oxide (IV), a platinum electrode, the electrochemical deposition and dissolution.
BIOCATALYTICTRANSESTERIFICATIONINSUPERCRITICALFLUIDS
N.V. Lakina, I.P. Shkileva, O.S. Burmatova, K.E. Salnikova
TverStateTechnicalUniversity
Department of Biotechnology and chemistry
The article provides an overview of trends in the application of lipases in the process of esterification and transesterification of industrially important chemical compounds in solvents and supercritical fluids. Possible limitations of the lipasesapplication were indicated. The dependence of the activity of the lipase on the type of producer, temperature, pressure, ratio of reagents was analyzed. It is shown that lipase can be successfully used for the enzymatic synthesis of biodiesel and valuable chemical intermediates with high yields.
Keywords:lipase, transesterification, biodiesel, supercritical fluids
LIQUID PHASE METHANOL SYNTHESIS OVER POLYMER STABILIZED ZINC-BASED CATALYST
V.V.Smelkova, M.A.Rubin, A.I.Sidorov, E.M.Sulman
TverStateTechnicalUniversity
Department of Biotechnology and Chemistry
The work is devoted to the possibility of application of polymer-stabilized Zinc-based catalyst in a liquid-phase methanol synthesis. In this paper the effect of the active phase of the catalyst content and the effect of solvent polarity on the rate of formation of methanol were studied. Varying the composition of the active phase of the catalyst in the range from 3% to 10% Zn MN100, the highest rate of methanol was reached at 7,5% Zn MN100. At varying ratios dodecane - isopropyl alcohol the highest rate of methanol formation was achieved in the experiment in pure isopropyl alcohol with selectivity to methanol of 92.5%. It is shown that the major side product of the synthesis was methane.
Keywords: liquid-phase methanol synthesis, Zinc-based catalyst, the composition of the solvent.
Influence of industrial pollution on a chemical composition and morphology
of yarrow and plantain
N. А. Solovyeva, D. М. Тоrоpоvа, Y. G. Оlеnеvа,
S.D. Khizhnyak, P.М. Pаkhоmоv
TverStateUniversity
The chemical composition of the medicinal herbs - yarrow and plantaincollected in areas with different degrees of environmental stress is investigated by means of FTIR, UV and atomic adsorption spectroscopy (AAS).It is established that composition of the analyzed herbsdepends onthe anthropogenic impact. Sensitiveness of the samples to a particular source of pollution is defined bythe plant species.
Keywords: yarrow Achilléa millefólium, plantain Plantágo májor, atomic adsorption spectroscopy (AAS), Fourier transform infrared and UV spectroscopy.
DEPARTMENT OF CHEMISTRYTVERSTATE
MEDICALACADEMY-60 YEARS
G.M.Zubarev, G.E.Bordinа, N.P. Lopina, Ya.M.Khalyapina
TverStateMedicalAcademy
Department of chemistry
Inconnection with the anniversaryof the TverStateMedicalAcademyis a briefoutline ofthe main stages ofthe development ofthe department of chemistry.
Keywords:department of chemistry, history of the department of chemistry, TverStateMedicalAcademy