Russian Chemical Bulletin最新文献

A composite material with magnetic properties, which consists of nanosheets of graphene-like carbon nitride and iron oxide, that is, Fe₃O₄/g-C₃N₄, was synthesized. The nanocomposite was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetry. The obtained material was used as an adsorbent to remove phosphate anions from aqueous media. The influence of process parameters (pH, initial phosphate anion concentration, contact duration, adsorbent dose, and temperature) on its efficiency was investigated. The adsorption mechanism was examined based on the analysis of surface potentials under different acidity conditions. A comparative study of the applicability of the Langmuir and Freundlich adsorption models for the description of experimental phosphate adsorption isotherms was carried out. The thermodynamic parameters of the process were calculated. The highly stable material can be easily removed from aqueous solutions using an external magnet after the completion of the adsorption experiments and reused in five to six cycles while continuing to demonstrate a high adsorption efficiency.

By reacting 2-aryl-1-(vinylsulfonyl)pyrrolidine with various diamines, new taurine derivatives containing pyrrolidine and diamine fragments were obtained. The proposed method affords taurine derivatives under mild conditions and in high yields. The structures of the products were confirmed by ¹H and ¹³C NMR and IR spectroscopy; the compositions were verified by elemental analysis.

Two efficient synthetic procedures for charge-compensated cobalt bis(dicarbollide) conjugates with 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY), in which the boron cluster is attached to the meso position of the dipyrrylmethene moiety were developed: (1) through the nucleophilic opening of cyclic oxonium derivatives of cobalt bis(dicarbollide) by BODIPYs modified with the benzyldimethylamino group; (2) through the synthesis of cobalt bis(dicarbollide) aldehydes followed by their condensation with 2,4-dimethylpyrrole, oxidation, and complexation with BF₃•Et₂O. The study of the optical properties of the BODIPY derivative with the benzyldimethylamino substituent and its boron-containing conjugates demonstrated that the attachment of the boron cluster enhances the fluorescence of BODIPY. Therefore, the synthesized compounds can be used for further biological assays as fluorescent boron neutron capture therapy agents to determine the distribution of boron in the body.

Alkylation of aniline with bicyclic monoterpenes, namely, (−)-β- and (+)-α-pinenes, in the presence of various catalysts was studied. Aluminum-containing catalysts were found to be efficient for the synthesis of N-substituted anilines with the p-menthene and bornyl structure of the terpene substituent. The reactions of α-pinene with an excess of aniline gave rise to substituted tetrahydroquinolines. Using various test systems, it was shown that the antioxidant activity of terpenylanilines significantly depends on the isomerism of the terpene fragment. N-Bornylaniline was found to be more active than N-alkylaniline with a p-menthene fragment, which makes it of interest for further, more detailed study as a new highly active antioxidant for technical and biomedicinal applications.

This review summarizes the recent advances in the oxidative cleavage of the furan ring as a structural component of complex molecules. Depending on the selected oxidizing agent and the degree of substitution of the furan ring, this approach provides saturated and unsaturated γ-dicarbonyl compounds, β-aryl(hetaryl) enones, enals or enoates, pyrrolin-2-ones and pyrrolidin-3-ones, γ-butyrolactones, and carbonyl alkynes. The review covers literature published from 2015 to 2025.

Creation of bioreceptor layers with predetermined morphology and functionality on the surface of electrolyte-gated organic field-effect transistors (EGOFETs) is a challenge for researchers working on the development of liquid biosensors. In this work, a biotin-containing receptor layer was formed directly on the surface of organic semiconductor (component of an EGOFET device) using the azide-alkyne cycloaddition reaction proceeding by the click mechanism. A new alkyne-functionalized [1]benzothieno[3,2-b][1]-benzothiophene derivative allows one to carry out the Cu^I-catalyzed click reaction on the EGOFET surface. The effect of the content of the alkyne derivative in the organic semiconductor on the morphology and functionality of the resulting bioreceptor layer is assessed. Subsequent modification of the biotin fragments with streptavidin and a DNA aptamer as a selective receptor allowed one to create a biosensor that detects the influenza A virus at a concentration of 3 • 10⁶ virus particles mL⁻¹, which corresponds to the sensitivity of the antibody-based test strips.

The activity of combined Co—V/SiO₂ oxide catalysts in the ozone-catalytic oxidation (OZCO) of volatile organic compounds (VOCs) using n-butane as a model compound was studied. The two-component Co₃O₄—V₂O₅/SiO₂ catalysts were shown to be much more efficient in VOCs oxidation at temperatures of 50–150 °C then the one-component Co₃O₄/SiO₂ and V₂O₅/SiO₂ systems. An enhanced efficiency of ozone-catalytic oxidation on the two-component Co₃O₄—V₂O₅/SiO₂ catalysts can be interpreted to mean that a bifunctional route is operative according to which the ozone decomposition step with the formation of highly reactive atomic oxygen (O*) proceeds on Co sites and the n-C₄H₁₀ activation step proceeds on V sites.

The catalytic hydrosilylation of three different α-olefins (1-octene, 2-vinylnorbornane, and vinylferrocene) was studied using chlorodimethylsilane as an activated hydrosilane in the presence of Pt-, Rh-, and Pd-containing catalysts. The reactions can proceed with quantitative olefin conversion and high anti-Markovnikov selectivity of hydrosilane addition. Conditions for the selective anti-Markovnikov addition of chlorodimethylsilane to vinylferrocene providing more than 98% total yield were identified.

Surface functionalization of organic electrochemical transistors (OECTs) is an urgent challenge in the development of biosensors. In this work, we propose a new method to functionalize the poly(3,4-ethylenedioxythiophene)—poly(styrene sulfonate) (PEDOT:PSS) active layer of OECTs with the bioreceptor layer. Namely, the surface of the PEDOT:PSS layer was modified with nonpolar hexyl groups. A Langmuir layer consisting of a siloxane dimer of [1]benzothieno[3,2-b][1]benzothiophene (BTBT) and its biotinylated derivative was used as the receptor layer. It was found that the receptor layer does not affect the mechanism of OECT operation and allows for transistor surface coverage with the recognition elements. The specificity of the developed biosensor is provided by the biotin-streptavidin interaction. A DNA aptamer specific to the influenza A virus was used as the recognition element, while the inactivated influenza B virus, the Newcastle disease virus, and an allantoic fluid were used as non-specific controls.

β-Diketonates of boron difluoride and polymer compositions based on them have recently attracted the attention of researchers due to their unique luminescent properties. The conformational behavior of the boron difluoride complexes significantly affects their optical properties. The conformational features of a number of symmetric boron difluoride curcuminoids and their effects on luminescent properties were investigated in this work. Dual luminescence was observed for the dyes studied: both blue (400–500 nm) and red (600–800 nm) luminescence were simultaneously detected. Using luminescence spectroscopy and quantum chemical calculations, the formation of rotamers and the twisted intramolecular charge transfer (TICT) state due to rotation around the single bond between the chelate cycle and double bond was explored. The effects of solvent polarity on the equilibrium between rotamers and the optical properties of the dyes were established.