The structure and composition of the nanocomposite based on the mixture of natural polyamide base and FeO filler, some physico-chemical properties were studied using elemental analysis, IR-spectroscopy, X-ray phase analysis, quantum-chemical calculations, thermal analysis, UV spectrosco-py methods. Studies were conducted to study the chemical composition of the initial components and compositions. The mole ratio of polyamide and iron particles filled into it was determined. Based on the results of thermal analysis, the liquefaction, decomposition temperatures and thermal stability of the composite were studied. Changes in vibration frequencies of carbonyl and amino groups in the polyamide base were observed with the help of the obtained IR-spectra. It was found that the stabilization of FeO polyamide by base occurs through these groups

The article studies the effect of bentonite clay on the agrophysical and chemical properties of soil and on improving the ecological environment of plants, and determines the effect of mineral clays on the fertility of Absheron soils, plant productivity, and ecological status. The effect of bentonite clays on the amount of phosphorus in the soil under corn plants and on the productivity of the plant was studied in the experimental area of the Absheron Peninsula. The results of the field experiment showed that the combined application of granular superphosphate fertilizer, which contains phosphorus (P2O5) in its composition, and mineral clay to the soil has a favorable effect on both plant growth and the development of soil mass and the increase in phosphorus absorption efficiency. It has been shown during research that, when applied to soil alone or in combination with superphosphate, mineral clay forms a number of weakly bound compounds in the soil, which improves the water-physical and air regimes of the soil and creates favorable conditions for plant nutrition. As a result of the research conducted, it was concluded that the use of bentonite clay in various soil types can have a positive effect on increasing the productivity of agricultural crops

Using the pyrazine- and triazine-modulated tripyridyldiamine ligand 6-phenyl-N2,N4-di(pyrazin-2-il)-1,3,5-triazine-2,4-diamine (H2dpztzda), a new mononuclear copper(II) complex [Cu(H2dpztzda)(NO3)2]∙2C3H7NO 1 has been synthesized, structurally characterized, and its antimicrobial properties studied. According to the single crystal X-ray analysis of complex 1, Cu(II) exhibits five coordination with a distorted trigonal bipyramidal geometry. The "inverted type" of EPR spectra (g┴ > g||~ ge), alongside results from magnetic moment susceptibility and electronic spectrum studies, collectively support this observation. The calculated Addison value for 1 is τ5 = 0.54, indicating also that the Cu(II) center possesses distorted trigonal bipyramidal geometry. The H2dpztzda molecule coordinates with the Cu(II) as a tridentate ligand. Complex 1 exhibits two types of hydrogen bonding: classical and non-classical. It has been shown that the interactions involving C-H‧‧‧π, π-π, and hydrogen bonding significantly influence the crystal packing of synthesised complex 1 and play a crucial role in the formation of supramolecular motifs. The antimicrobial activity of the compounds was evaluated using the traditional well diffusion method. Both compounds (complex 1 and H2dpztzda ligand) analyzed for antimicrobial activity showed highly effective results against the bacteria Pseudomonas aeruginosa, Mycobacterium phlei, and the fungi Aspergillus niger and Penicillium chrysogenum in lubricants and coolants

The formation of novel mixed-ligand fluoromanganate(III) complexes was achieved in aqueous medium, demonstrating the fluoride-assisted stabilization of Mn(III). These complexes were synthesized by reacting MnO(OH) and 40% HF with oxygen donor ligands such as mannitol and resorcinol. The resulting compounds are stable over long periods when stored in polythene bags. Consistency of the compounds can be assessed through manganese and fluoride content analysis or determination of the manganese oxidation state. The compounds exhibit poor solubility in common organic solvents and limited solubility in water. Characterization was conducted via elemental analyses, cyclic voltammetry, electronic spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy, and magnetic susceptibility measurements at room temperature. The data indicate a distorted octahedral geometry for the complexes. Additionally, the fluorescence and antibacterial activity of one of the complexes were investigated

An amphiphilic helicene derivative, 9-hydroxy-oxa[9]helicene (HO9H), was used for the fabrication of Langmuir-Blodgett (LB) films at the air-water interface. The deposited film was characterized by different experimental techniques, and its photochemical properties were investigated. It was demonstrated that the compound HO9H forms multilayers film or aggregates at the air-water interface due to insufficient hydrophilicity. This result was confirmed by Brewster angle microscopic (BAM), atomic force microscopic (AFM), and X-ray reflectivity (XR) analysis. The experimental findings confirm the perpendicular orientation of helicene molecules with respect to the plane of substrate in the film. Furthermore, it was found that upon light irradiation, HO9H generated a considerable amount of photocurrent, highlighting its potential as an organic photoelectronic material

Amide-based molecules play a significant role in various scientific and industrial applications, including pharmaceuticals and agrochemicals, due to their structural and functional properties. This study focuses on the synthesis and evaluation of a novel amide, N-(2-bromoethyl)-4-nitrobenzamide, to enhance antimicrobial properties. The amide was synthesized via a condensation reaction between 4-nitrobenzoyl chloride and 2-bromoethylamine hydrobromide, using pyridine as a base. The structural characterization was conducted through ¹H and ¹³C NMR spectroscopy, confirming the successful formation of the amide bond. To improve the antibacterial efficacy, a supramolecular ensemble was formed by incorporating the synthesized amide with graphene oxide nanolayers, prepared using a modified Hummer method. The antibacterial activity of the amide and its ensemble was assessed against bacterial strains including Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae. Results showed that the graphene oxide enhanced the antimicrobial potency, with significantly lower minimum inhibitory concentrations (MICs) compared to the amide alone and the standard antibiotic ampicillin. The study demonstrates the potential of amide-graphene oxide composites for developing new antibacterial agents with improved activity

Based on readily available initial reagents, boron-containing compounds of various composition and structure have been synthesized. Hydroxymethyl esters of xanthogen, dithiophosphoric acids, hydroxymethylsulfamide and dialkyl esters of boric acid were used as initial reagents. As a result of the work done, a number of boron- and boron-nitrogen-containing compounds have been synthesized. The structure and composition of the synthesized compounds have been proven by studying their physicochemical properties, elemental analysis, and IR spectroscopy and gas chromatography (GLC) methods. A study of the tribological characteristics of S-(dialkyloxyboryl)xanthates and -diisopropyldithiophosphate in MS-20 aviation oil has established their high anti-seize efficiency, and the derivative of diisopropyldithiophosphoric acid is also characterized by anti-wear properties. The dependence of the extreme pressure properties of the synthesized compounds in the series of S-(dialkyloxyboryl)xanthates on the radical value in dialkyl esters of boric acid was revealed. A higher extreme pressure efficiency of the boron-containing ester of dithiphosphoric acid was shown compared to the ester of xanthic acid of a similar structure. Due to limited solubility in mineral oils, dibutoxyboryltoluenesulfamide was investigated as an antimicrobial additive in water-soluble cutting fluids (CFL). Analysis of the obtained results showed their high efficiency in this area of application

The presented work is devoted to the synthesis of new modifiers containing low-viscosity oligoesters of epoxy (methyl)acrylate with a branched structure, determination of optimal conditions for their production and the creation of new modifiers for various purposes with high performance characteristics based on them, due to the reaction of the interaction of propantriol-, polyoxychloropropylenetriglycidyl esters (met)with acrylic acids, it is dedicated to the production of hybrid epoxy compounds and the study of their properties. The synthesis of oligoepoxymethacrylates by esterification of trialkyl triepoxide with methacrylic acid has been carried out. The influence of esterification conditions on the composition and yield of reaction products has been studied. It is shown that by varying the reaction conditions, the process can be directed towards preferentially obtaining mono-, di- and trimethacrylic oligoesters. Synthesized oligoesterepoxymethacrylates are used as a modifier of epoxy resin. Self-extinguishing compositions were obtained on the basis of epoxy resin ED-20 and synthesized oligoester epoxymeth acrylates. The materials obtained by curing these compositions with amine and anhydride hardeners are characterized by increased physico-mechanical, adhesive and thermophysical properties

The method of electrochemical deposition was used to purify water contaminated with heavy metals (copper and nickel). The study was carried out by changing the duration of the experiment and the distance between the electrodes. As a result, the dependence of both the processes of deposition of metal ions on the travel time and the inter electrode distance was determined. With increasing voltage, the deposition of ions of both metals reached its maximum value. In the article, the method of electrochemical treatment (electrochemical deposition) is used to purify water contaminated with metal ions. To achieve the deposition of copper and nickel ions, the experiments investigated the parameters affecting the process - the distance between the electrodes, the current, the working surface of the electrodes, the amount of metal ions in wastewater. First, the effect of the inter electrode distance on the efficiency of the process was studied. At the same time, experiments were carried out with changes in deposition time and stress and the impact of these parameters on cleaning efficiency was studied. It was established that depending on the working surface of the electrodes, the cleaning effect was low at a distance between the electrodes of 6 cm and 10 cm, and the output power (cleaning effect) was high between the electrodes of 8 cm. In the study The influence of stress on the process, it was established that at high voltage (9 V) the destruction of both metals reach the maximum value. In this work, the wastewater containing heavy metal ions was treated with an electrochemical method that not only re-duced the value of chemical oxygen demand and reduced the number of heavy metal ions, but also produced hydrogen throughout the process. A series of experiments were carried out under the optimal conditions of the selected electrode materials, pH values, power supply capacity and working time. The results show that by controlling the key factors of the process, it is possible to implement a practical method of the wastewater treatment, which also produces a significant amount of green energy

Composite catalysts based on metal-modified mordenite zeolite (module 17) and sulfated zirconium dioxide were synthesized. With the participation of these catalysts, the isomerization conversion of gas gasoline at low temperature (160–2000C) and normal atmospheric pressure was studied. The role of each of the components of the catalyst in this process was studied. It has been found that the addition of a metal (cobalt or nickel) to the zeolite increases the stability of the catalytic system, zirconium dioxide lowers the process temperature, and sulfate anions facilitate isomerization. The components of the catalytic system are not active individually in this process under the given conditions, and these components carry out the process together. It was determined that with the participation of the synthesized catalytic system, the low and high molecular weight components of gas gasoline were converted into medium molecular weight and mainly iso-C5-C6 alkanes. Thus, it was shown that the synthesized catalytic systems have the ability to convert gas gasoline into environmentally friendly, high-octane gasoline components. It has been found that the stability of the catalytic system depends on the nature of the metal in its composition and the temperature at which the system is initially operated in a hydrogen environment. It has been shown that the deactivation of a catalyst may be due to the occupation of its active surface by condensation products and, the deactivation rate of the catalysts is proportional to the rate of accumulation of condensation products on the catalyst surface and inversely proportional to the rate of their disproportionation via hydrocracking/hydrogenolysis