Russian Journal of Applied Chemistry最新文献

In this article, we aim to use polyvinylazoles as a support for mercury acetate, which can be used as a heterogeneous catalyst in transvinylation reactions for the synthesis of vinyl derivatives of azoles. The transition from a homogeneous to a heterogeneous system in transvinylation reactions allows for the easy separation of the catalyst from the reaction mixture and its reuse, which thereby reducing mercury salt pollution in wastewater. Cross-linked polyvinylazoles, obtained through radical copolymerization of vinyltriazole and vinylimidazole with divinylbenzene, were used as a support. Subsequently, these cross-linked polymers were heated in a mixture of benzene and acetic acid with mercury oxide. The amount of mercury acetate in the obtained complex is 60–65%. The structure of the obtained complexes was confirmed by IR spectroscopy, and they were tested as heterogeneous catalysts in transvinylation reactions in the azole-vinyl acetate system. It has been shown that the obtained heterogeneous catalysts can be successfully used (approximately six times) in selected transvinylation reactions. The structure of the obtained vinylazoles was confirmed by IR and NMR ¹H and ¹³C spectroscopic methods.

A series of N,N'-(methylenebis(4-methyl-7-nitrobenzo[d]thiazole-6,2-diyl))bis(1-arylmeth- animine) derivatives 3a–3o were synthesized by the reaction of 6,6'-methylene bis(2-amino-4-methyl-7-nitrobenzo[d]thiazole) with different aromatic aldehyde. All the synthesized compounds were characterized by spectroscopic analysis such as FTIR, ¹H NMR, ¹³C NMR, mass spectra and elemental analysis. The antibacterial activity of these compounds was first studied in vitro by the disk diffusion assay against gram positive and gram negative bacteria. The minimum inhibition concentration (MIC) was then determined with the references of standard drug Ampicillin and Chloramphenicol. The antifungal activity was examined against Candida albicans, Aspergillus clavatus, and Aspergillus niger by the serial plate dilution method using Nystatin and Griseofulv in as standard. All fifteen derivatives were docked against the two proteins, namely carbonic anhydrase 2 (PDB ID: 7SEV) and lanosterol 14 alpha demethylase ((PDB ID: 5V5Z).The compound 3m has shown the best binding score against carbonic anhydrase 2 (PDB ID: 7SEV) (–9.785 kcal/mol) and compound 3o has shown the best score for fungal lanosterol 14 alpha demethylase (–12.538 kcal/mol). The physicochemical properties of potent derivatives were also reported.

Wastewater contaminated with oil and organic materials, also known as oily wastewater (OW), is commonly produced in both industrial and residential settings. This type of wastewater typically contains fats, oils, and greases, along with petroleum-based substances like diesel oil, gasoline, and kerosene. OW is regarded as a severe threat to humans, plants, and animals in special and the environment generally, jeopardizing ecosystems. There is an increasing demand for efficient treatment techniques due to the increased OW worldwide discharge and stringent limits on effluent discharge. Traditional approaches have proven to be inefficient, costly, and time-consuming, often resulting in secondary pollution. The adsorption technique, on the other hand, is thought to be a more practical choice because of its ease of use, cheaper startup costs, and reduced need for land. With better separation efficiency and lower operating costs, the adsorption technique has become a viable option for treating OW. The development of super adsorbents with high adsorption capacities has further enhanced the effectiveness of this method. Advanced technologies in adsorption are constantly evolving to meet the current and future demands of OW treatment.

This passage provides a summary of the raw materials and the underlying principles for the synthesis of polyurethane materials. It also outlines both traditional and environmentally friendly approaches to polyurethane production. The traditional methods encompass one-shot, prepolymer, and semi-prepolymer techniques, while the green synthesis methods involve the use of carbamates and bicyclic carbonates. This paper summarizes the synthesis route at home and abroad, summarizes the shortcomings and deficiencies of traditional synthesis methods, and combined with the development trend at home and abroad, puts forward a new route based on waste recycling and green synthesis of polyurethane elastomer, to provide a new idea for the recovery and high-value utilization of waste resources.

Addition polymerization of three norbornene-type monomers derived from various diamines and cis-5-norbornene-exo-2,3-dicarboxylic acid anhydride in the presence of Pd complexes with an N-heterocyclic carbene ligand was studied. The polymerization conditions for these bifunctional polymers containing imide fragments were optimized, which made it possible to produce the target polymers in yields of up to 75%. The structure of the synthesized polymers was confirmed using IR, Raman spectroscopy and solid-state ¹³C NMR spectroscopy. The main physicochemical properties of the obtained addition polymers were investigated by TGA, DSC, X-ray diffraction, as well as low-temperature adsorption of nitrogen and CO₂. The effect of the bridge nature in the bifunctional norbornene-type monomer on the sorption properties of the addition polymer based thereon was established. It was shown that the sorption for the addition polymer based on the monomer obtained from isophoronediamine exceeds 13 cm³/g.

This paper replaced 3-nitro-1,2,4-triazole-5-one (NTO) with the chlorine branches of the polyepichlorohydrin (PECH) compound and analyzed the inhibitory efficiency of this compound for the steel immersed in a (1-M) solution of hydrochloric acid. The synthesis of this compound was confirmed by the Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), elemental analysis (CHN), thermal analysis (TGA), and visible-ultraviolet (UV-Vis) spectroscopy. Moreover, the inhibitor corrosion properties of this compound in the acidic solution were analyzed through the electrochemical impedance spectroscopy (EIS), polarization, and quantum chemistry tests. According to the results, the sample containing NTO and SO(OH) had the highest rate of inhibition corrosion. Its efficiency was enhanced by increasing the concentration of inhibitors in the acidic solution, something which indicated the dominant role of the adsorption mechanism in improving the inhibitory properties of the system. Furthermore, the results of the polarization test depicted that the inhibitors acted as mixed inhibitors in an acidic medium and affected both anodic and cathodic reactions of corrosion through adsorption on the surface of the steel immersed in a corrosive medium.

A series of novel epoxy : phenol polymer thermosets (P1–P3) are synthesized from the reaction of phenol containing triphenylamine (TPA)-azomethine and epoxy resin, diglycidyl ether of bisphenol A with n = 0.03. TPA linked azomethine-based phenol were synthesized by the acid catalyzed reaction of aromatic/aliphatic amine and 4,4'-diformyl triphenylamine. Which were characterized by elemental, Fourier transform infrared (FT-IR) and ¹H NMR spectral analysis. The thermosetting polymers were characterized via FT-IR spectral analysis. The incorporation of TPA moiety in connection with azomethine linkage improved the processability of the resulting polymers, therefore, synthesized polymers are soluble in a variety of common organic solvents. Thermal features of P1–P3 were evaluated via differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Aromatic TPA moiety in the thermosetting network has enhanced their thermal stability (upto 370°C) as compared to conventional epoxy : phenol thermosets. The photophysical properties of the thermosetting polymers were determined via UV-visible absorption and photoluminescence (PL) emission spectral analysis in NMP (10 μM) as well as in solid state. All the polymers were optically transparent and exhibit excellent blue light emission in the range 435–460 nm with PL quantum efficiency in the range 1.5–7.7. The mechanical stability of all the polymers was evaluated by tensile strength measurement. The above-mentioned characteristics indicate that the synthesized thermosetting polymers display appreciable thermal stability, efficient blue light emission and appreciable processability as well as good mechanical strength, which can be potential candidates as light emissive coatings and adhesives.

In the last ten years, the use of nanotechnology in the food industry has increased dramatically. Food packaging has become more demanding in order to provide consumers with high-quality foods with long shelf lives, such as improved food taste, color and flavor modification, texture and consistency variation, increased nutrient absorption and bioavailability, and new food packaging materials with improved mechanical, barrier, and antimicrobial properties. This article review discussed the processes for synthesizing nanoparticles and nanocomposites for use in food packaging to enhance the mechanical strength and characteristics of the packaging’s water and oxygen barrier and the benefits and drawbacks of nanomaterials in food packaging.