Russian Journal of Inorganic Chemistry最新文献

Vanadium(V) oxide films doped with 10 mol % NiO and 10 mol % WO₃ were prepared by aerosol printing. In the case of nickel doping, the film crystallized in the tetragonal β-V₂O₅ modification with strong texturing along the {200} crystallographic plane, while tungsten doping resulted in an X-ray amorphous material. The nickel-doped film consisted of one-dimensional structures, whereas the V₂O₅–10 mol % WO₃ composition formed particles of irregular or nearly spherical shape. The electron work function values indicated high number of defects in the WO₃-containing film. Both samples exhibited anodic electrochromism, with the V₂O₅–10 mol % NiO demonstrating higher optical contrast and coloration efficiency. The results clearly show the influence of dopant nature on the functional properties of the obtained materials and demonstrate the potential of aerosol printing for fabricating electrochromic films.

Graphene oxide (GO) and composites based on it are often used to produce graphene-like materials by thermal or chemical reduction, and the reduction method strongly affects the properties of the materials. In this study, a new method was proposed to prepare a conductive composite based on reduced graphene oxide (rGO) with magnetite nanoparticles (NPs) with an average diameter of 18 nm dispersed on its surface. The method consisted of treating a GO-based composite with Fe₃O₄ on the its surface in supercritical isopropanol. The composites based on GO and rGO and magnetite NPs were investigated by FTIR spectroscopy, X-ray powder diffraction analysis, and scanning electron microscopy. It is shown that the sample compact film of the rGO-based composite has specific surface resistivity is 22 Ω cm^–2 and saturation magnetisation is 32.3 emu/g.

Efficient synthetic methods have been developed for hybrid compounds based on layered yttrium hydroxide (LYH) intercalated with malonate complexes of d-metals (Cr³⁺, Fe³⁺, Ni²⁺, Cu²⁺, or Zn²⁺) and f‑metals (Eu³⁺ or Tb³⁺). The influence of the anion-exchange reaction temperature and the nature of the intercalated metal cations on the orientation and coordination modes of malonate anions in the LYH interlayer space has been systematically studied. The amount of incorporated d- and f-metal cations increases in the following order: Tb³⁺ < Ni²⁺ < Zn²⁺ < Cu²⁺ < Cr³⁺ < Eu³⁺ < Fe³⁺. These findings demonstrate that malonate-intercalated LYH is a versatile platform for the design of novel d- and f-metal-based hybrid materials.

Cubic α-Mn₂O₃ was synthesized by microwave-assisted hydrothermal treatment of a reaction mixture containing potassium permanganate and ascorbic acid taken in a molar ratio of 1: (1–1.5) followed by annealing in air. A possible mechanism for the formation of manganese(III) oxide was proposed. The main physicochemical characteristics of the synthesized α-Mn₂O₃ were determined using powder X-ray diffraction, scanning electron microscopy, and low-temperature nitrogen adsorption. It was found that β-MnO₂, Mn₃O₄, and MnO/C and Mn₃O₄/C composites can be additionally obtained by varying the molar ratio of the components of the reaction mixture and the conditions of annealing of the precursors.

The interaction of thallium(I) N,N-dipropyldithiocarbamate with [AuCl₄]^– anions in a 2 M HCl medium has been studied. The heterogeneous reaction of gold(III) binding from solution to the solid phase, involving a redox process, results in the formation of the double dithiocarbamato–chlorido complex [Au(S₂CNPr₂)₂][TlCl₄]. The crystals of this compound are prone to polymorphism: at 220 K, the complex exists in the form of the α-modification (α-I), while at 296 K the β-modification (β-I) is stable. The α-I/β-I structures include 4/2 nonequivalent square-planar [Au(S₂CNPr₂)₂]⁺ cations (A, 2 B, C/A, B) and 2/1 distorted tetrahedral [TlCl₄]^– anions. Self-assembly of these structural units, which are combined due to interionic secondary interactions (the most important of which are chalcogen bonds S···Cl), leads to the formation of complicated supramolecular architectures such as pseudopolymeric cation–anion ribbons. Alternating along the edges of these ribbons and acting as double linkers, thallium(III) anions pairwise combine neighboring isomeric [Au(S₂CNPr₂)₂]⁺cations located in the central part of the ribbons. Studying the thermal behavior of the complex, it was demonstrated that individual thermolysis products are TlCl and elemental gold, which is quantitatively reduced and crystallized under low-temperature conditions (up to 300°C).

To effectively remove dyes from wastewater, carboxyl-functionalized and amine-functionalized Fe₃O₄ magnetic nanoparticles were synthesized by hydrothermal method and co-precipitation method, respectively, then coated with BSA through reverse emulsion. Their difference in morphology and structure of different functionalized magnetic nanoparticles are recognizable by X-ray diffraction, Fourier transform infrared (FT-IR) and scanning electron microscope (SEM). And their thermal stability and magnetic properties were examined through thermogravimetric analysis (TGA) and magnetic hysteresis curves. In addition, their dye removal behavior was examined. Results demonstrated that the composite particles have a good removal effect on Congo red and Alizarin red. The experimental maximum adsorption capacity of composite particles BSA-coated carboxyl-functionalized Fe₃O₄ for Congo red and Alizarin red is 546.914 and 89.25 mg/g, respectively. The maximum adsorption capacity of BSA-coated amine-functionalized Fe₃O₄ is 486.25 and 71.34 mg/g, respectively. Both the adsorption processes of dyes on the composite particles fitted well with the pseudo-second-order kinetic model. Their adsorption isotherm were more in line with the Langmuir model than the Freundlich model. It was inferred that the adsorption process was spontaneous adsorption from the values of the thermodynamic parameters of the reaction between dyes and composite particles. The two types of composite particles show potential applications in the removal of dyes from wastewater. This expands their application fields, as previously only the use of such BSA/Fe₃O₄ composite particles for treating heavy metals in wastewater had been reported.

Two novel zinc(II) coordination polymers, namely [Zn₂(ptca)(OH)(bpe)(H₂O)]_n (1) and {[Zn(Hptca)(bpa)]·H₂O}_n (2) (H₃ptca is 1,3,5-pentanetricarboxylic acid, bpe is 1,2-bis(4-pyridinyl)ethylene, bpa is 1,2-bis(4-pyridinyl)ethane) have been prepared through solvothermal reactions. Single-crystal X-ray diffraction revealed that both complexes 1 and 2 have two-dimensional layer structures pillared by nitrogen-donor ligands, wherein different degrees of deprotonation and coordination modes of carboxylate groups are observed. In addition, the fluorescent properties of complexes 1 and 2 have been studied in the solid state at room temperature.

In the magnesium chlorate–ureamonoethanolammonium acetate–water system, the binary system consisting of Mg(ClO₃)₂–H₂O was initially studied from –52.0°C to the melting point of the initial components, and a diagram of the binary system was drawn. All eutectic points were identified in the constructed diagram. In order to fully describe the system, the binary system of the first and second substances was first studied. It was found that the eutectic point of the binary system consisting of C₃H₈O₃N₂∙NH₂C₂H₄OH–H₂O corresponds to the temperature of –31.0°C when there are 54.4% monoethanolammonium acetate urea and 45.6% water. Based on the binary systems of studied starting materials and six internal sections, the phase polythermal solubility diagram of the Mg(ClO₃)₂–C₃H₈O₃N₂∙NH₂C₂H₄OH–H₂O system was constructed. The polythermal solubility diagram was studied at the temperature from –52.0 to –3.0°C and the wide concentration range based on binary systems of the starting substances and six internal sections. The crystallization field boundaries of ice, C₃H₈O₃N₂∙NH₂C₂H₄OH, Mg(ClO₃)₂∙6H₂O, Mg(ClO₃)₂∙12H₂O, and Mg(ClO₃)₂∙16H₂O were determined in the diagram. The studied system belongs to the complex eutonic type, the starting substances retain their properties in solution and no new compounds are formed.

Boron cluster compounds are inorganic polyhedral structures used in various fields, they have a wide range of different types of bioactivity and are perspective compounds for boron neutron capture therapy of cancer. Therefore, they require the development of various analytical techniques for qualitative and quantitative analysis and determination of their properties. Capillary electrophoresis (CE) is an interesting, universal method for analysis of charged substances. However, there is a fairly limited number of boron cluster compounds studies using CE. Here reports the possibility of a technically simple method of capillary zone electrophoresis analysis of boron clusters [B₁₀H₁₀]^2– and some of its derivatives, as well as the [B₁₂H₁₂]^2–. The possibility of anions analysis in normal and reverse polarity separation modes in the absence of capillary surface modifiers or capillary wall polymer coating has been demonstrated. Electrophoretic mobilities were determined for analyzed compounds. The presented work is a clear example of the fact that capillary electrophoresis can serve as a simple and convenient method for soluble and partially water-soluble boron cluster compounds analysis.

Z-scheme plasmonic photocatalytic Ag/AgBr/Bi₂WO₆ nanocomposites were synthesized by precipitation–sonochemical deposition method. X-ray powder diffraction, FTIR spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy were used to certify the coexistence of spherical Ag and AgBr nanoparticles randomly supported on the surface of orthorhombic Bi₂WO₆ nanoplates. In this research, the visible absorption of Ag/AgBr/Bi₂WO₆ nanocomposites was better than that of pure Bi₂WO₆ and AgBr/Bi₂WO₆ samples because of the synergistic effect of surface plasmon resonance (SPR) of metallic Ag nanoparticles and Z-scheme Ag/AgBr/Bi₂WO₆ heterojunctions. Photocatalytic activity and mechanism of ternary Ag/AgBr/Bi₂WO₆ photocatalyst were investigated under visible light illumination and discussed in details according to the experimental results.