The new benzimidazole-functionalized graphene
material based on graphene oxide (GO) and 3,3',4,4'-
tetraaminodiphenyl oxide (TADPO) was obtained
under one-step hydrothermal synthesis conditions.
According to IR spectroscopy and elemental analysis,
as a result of the reaction, benzimidazole (BI) rings are
formed, and the mass content of nitrogen is 12.3%.
The new graphene material is characterized by
excellent electrochemical efficiency in a threeelectrode
supercapacitor. As a result of the redox
activity of BI cycles the specific capacitance reaches
286 F/g at the scan rate of 2 mV/s, which is
substantially higher than the reduced graphene oxide
(RGO) sample obtained under similar conditions
without using TADPO (159 F/g at 2 mV/s)
The present article belongs to the area of organic chemistry, namely, to chemistry of heterocyclic compounds. For the purpose of optimization of a method of synthesis the threecyclic heteroaromatic systems containing a pyridi-ne, thiophen and pyrimidine ring in one molecule, - tetrahydropyridothienopyrimidinon and dihydropyri-dothienopyrimidinon – reaction 3-aminothieno[2,3-b]-pyridine-2-carbokxamides with aromatic aldehydes is studied, some of which contain pharmacolodical groups. Reaction was carried out in the conditions of an acid catalysis – is used p-TsOH. Influence of the nature of solvent (toluene, ethanol, mix ethanol-dimethilform-amide (1:1)) on the course and the direction of reaction are studied. It is established that carrying out reaction in toluene leads to the dihydropyrimidine containing in situation 2 phenyl, 4-bromphenyl deputies. In the presence in a molecule of initial aldehyde of the deputy in orto-situation tetrahydropyrimidine are formed. Use of ethanol mainly leads to formation of a tetrahydro-pyrimidine ring. Boiling of initial substances in mix ethanol-DMF yields the results similar to use of toluene, but time of reaction is reduced twice. The way of receiving the dihydroderivatives short-term boiling of tetrahydropyrimidine is found in mix isopropanol-DMF (a volume ratio of solvents 1:3). Identity of the received substances is proved by method of a thin layer chroma-tography. The structure of the synthesized connections is confirmed with the element analysis. The structure of tertagidropirimidinon and digidropirimidinon is proved with use of data of IK and NMR 1H of the spectral analysis
This publication examines the relationship between the structure of molecules of complexing (descriptors of electronic structure), which are used as inhibitors of hydrogen embrittlement of the steel grade St3, and the content of absorbed hydrogen in model samples-plates made of the above steel. The form of expression of this relationship is the correlation coefficient (CC) by Pearson
The current-voltage characteristics and the number of
effective ion transfer, as well as the frequency
spectrum of the electrochemical impedance of
multilayer ion-exchange membranes in a stable and
controllable thickness of the diffusion layer were
measured, using the of rotating membrane disk
complex. The article presents a comparative analysis
of the frequency spectra of the electrochemical
impedance of the source and a surface-modified
monopolar anion exchange membranes in 0.01 M
sodium chloride was made. The process of water
molecules dissociation at current densities above the
limiting one in 0.01 M sodium chloride solution was
studied in detail
Acylation of amides substituted with pyridine-3-
sulfonic acids oxalil-chlorides and phosgene was
studied. New pyridil-3-sulfonil isocyanates were
synthesized. The conditions for this synthesis were
optimized by taking into account the detailed
understanding of this acylation. The synthesized
pyridine-3-sulfonyl isozyanates were converted to
pyridine-3-sulfonyl ureas. Biological activity of the
new compounds was studied and the substances with
high herbicidal effect were found
The change in the Kepler’s atomic number in the
Periodic Table of Mendeleev is studied. It is shown
that its values decrease regularly with increasing
nuclear charge. An alternative formula for computing
the values of the Kepler’s atomic number is proposed.
It is shown that the ratio of the atomic number of
Kepler’s to the mass of the atom is a constant for each
period. The values of these constants are calculated
Macrodeficiency of polymeric materials, including the
pervasive one, is a consequence of the development of
initial microdefects which appear in polymers both
due to external factors and during their processing. In
the article, the problem of the detection of structural
microdeficiency of various polymeric materials
through an assessment of their structural parameters is
solved. The considered materials possess
approximately identical degree of crystallinity (60 –
66%), but different density. The express assessment
technique of polymeric materials microdeficiency by
the sorption method with the use of the academician
M. M. Dubinin’s theory of volumetric micropore
filling is developed and evaluated. On the basis of a
quantitative assessment of sorption processes in
polymeric materials, including elastomeric
compositions – rubbers and rubberized fabrics, the
existence of the initial local microdefects arising in
the course of synthesis is established. In real
polymeric materials, including elastomeric
compositions – rubbers and rubberized fabrics, the
existence of the initial local microdefects arising in
the course of synthesis is established (the number of
microdefects n varies from 1x1017 sm-3 to 6x1019 sm-3
,
and the rated linear size k – from 2 nm to 7 nm). The
general reduction of microdeficiency in rubberized
fabrics in comparison with initial rubber is revealed
and rationalized
Studying natural phenomena in all their diversity,
humanity worked experienced in every field of
science the model of perceiving the world and
methods of obtaining information. The development
of science currently cannot be imagined without
research on the intersection of its regions. This
article presents the results of the automated systemcognitive
analysis of the size of atoms from the
main characteristics that are of research at the
interface of General chemistry elements and
intelligent systems. Dependence of nuclear radius,
mass and of the atom and the charge number are
identical in shape and size, which is probably
connected with the linear increase of these
parameters in the Periodic system of chemical
elements. There is also a similar form of the
dependences of radii of atoms from the factors ex
and x, because these factors are interrelated. The
obtained results of the ask analysis have confirmed
the theoretical assumptions and the formulae of the
dependence of main characteristics of the atom
The article studies adsorption of ascorbic acid on
KSMG silicagel. The experimental results, the basic
thermodynamic characteristics of ascorbic acid adsorption
on oxide silicon have been used for treatment of
adsorption mechanism of ascorbic acid on silica
KSMG. Results of the study ascorbic acid adsorption
on silica gel KSMG may be used for further identification
of it in the various objects
The article illustrates the results of the research dedicated to finding a method of combining two polymeric materials - ion-exchange membranes having different chemical nature. It shows a method of applying a homogenous film MF 4SK on the surface of the heterogeneous membrane substrate to produce a chemically and mechanically stable asymmetric bipolar membrane. We have selected membrane substrate ensuring the best electrochemical performance