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Volume 515, Nº 1 (2024)
CHEMISTRY
Antifouling coatings for electrochemical sensors
Resumo
Electrochemical sensors are extremely promising for the analysis of a number of organic and inorganic compounds both in biological fluids and natural waters during environmental monitoring due to easing operation, ease of miniaturization, low cost, low limits of analyte determination and the possibility of modifying electrodes with a wide range of organic and inorganic compounds and nanomaterials. One of the main problems limiting the use of electrochemical sensors is electrode fouling. The main way to solve this problem is antifouling coatings. Depending on the application, various additional requirements are imposed on the antifouling coatings, such as, for example, biocompatibility or mechanical strength. In this review, various types of antifouling coatings for sensors are considered, the main areas of application of certain coatings are indicated. The main emphasis is placed on non-biocidal coatings, as the most promising ones.
3-17
Synthesis of 4-amino-1,3-diarylimidazolium chlorides
Resumo
The first representatives of 4-amino-1,3-diarylimidazolium chlorides have been synthesized by heating chloroacetonitrile with N,Nʹ-diarylformamidines containing alkyl substituents at positions 2 and 6 of the N-aryl groups. The possibility of postfunctionalization of the obtained aminoimidazolium salts by acylation of the amino group was demonstrated, as well as their applicability as precursors of N-heterocyclic carbenes in the synthesis of Cu/NHC complexes after preliminary protection of the amino group.
18-29
Perovskite-like limited solid solution in the BaO–Y2O3–CuO–MoO3 system
Resumo
A new phase Ba2(Y,Cu,Mo)2O6 with the cubic perovskite structure Fm-3m has been obtained in the BaO–CuO–Y2O3–MoO3 quasiquaternary system, and the possibility of coexistence of two limited solid solutions with cubic structures Fm-3m and F-43m has been established. The samples were synthesized by gel combustion followed by calcination at 1000°C and cooling in the inertial thermal regime. The studies were carried out by X-ray phase analysis, X-ray fluorescence spectrometry, infrared spectroscopy, and diffuse reflectance spectroscopy.
30-35
CHEMICAL TECHNOLOGY
Anti-tumor activity of cobalt-containing complexes of potassium and sodium polygalacturonates and pharmacological compositions based on them
Resumo
Based on the method developed in this study for obtaining water-soluble PGKCo and PGNaCo, which we had previously synthesized, a pharmacological composition (PC) containing simultaneously the macroelements K and Na, as well as the trace element Co, was obtained for the first time. The effect of polygalacturonates and PC on the viability of cells of tumor lines of various origins was studied in vitro. It was shown that the target products have water solubility, low toxicity (LD50 above 5000 mg kg–1) and selective cytotoxic activity against the tumor cell line of human lung carcinoma A549, breast adenocarcinoma MCF-7 and cervical carcinoma M-HeLa. The results obtained confirm the prospects for further research into water-soluble metal complexes and PC based on pectin biopolymers for the treatment of cancer.
36-44
PHYSICAL CHEMISTRY
Transformation of aromatic hydrocarbons in the process of hydrogenation of a concentrated mixture to produce clean fuels
Resumo
The process of hydrogenation of a modeling mixture of aromatic hydrocarbons was studied in order to develop regulated approaches for producing environmentally friendly fuels. The process was carried out on a trimetallic PdNiCr catalyst deposited on aluminum oxide. The optimal conditions for carrying out the reaction were determined. The influence of the structure of substituted substrates on the formation of by-products of the ring-opening reaction has been established.
45-53
Thermodynamic functions of Tm2O3‧2HfO2 solid solution and Shottky anomaly
Resumo
The molar heat capacity of the solid solution Tm2O3‧2HfO2 has been determined for the first time by relaxation, adiabatic and differential scanning calorimetry, the temperature dependences of entropy and enthalpy increment in the temperature region 0–1800 K have been calculated, and the contribution to the heat capacity of the Schottky anomaly at 0–300 K has been evaluated.
54-64