


Том 69, № 10 (2024)
СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ
The Iminoacylation Reaction of Iodoaniline with [2-B10H9NCCH3]– Anion is a Route to the Preparation of New Boron-Containing Synthons
Аннотация
This work is devoted to the study of the nucleophilic addition reaction of isomers of iodo-aniline to the nitrile derivative of closo-decaborate anion. The structure of the products was established by multinuclear NMR spectroscopy, ESI-mass spectrometry, and IR spectroscopy. The structure of compound (NBu4)[2-B10H9NHC(CH3)HN(2-C6H4I)] was established by single crystal X-ray analysis.



New Method for the Synthesis of Acetylacetone-Based Closo-Borate Anion Derivatives [BnHn–1NH=C(R)C(C(OH)CH3)C(O)CH3]–, Where n = 10, 12, R = Me, Et
Аннотация
The processes of nucleophilic addition of acetylacetone as a C-nucleophile to multiple bonds of nitrile derivatives of boron cluster anions have been studied in this work. The structure of the products was established by multinuclear NMR spectroscopy, ESI-mass spectrometry, and IR spectroscopy. The structure of compound (NBu4)[2-B10H9NH=C(C2H5)C(C(OH)CH3)C(O)CH3] was established by single crystal X-ray analysis.



Synthesis, Optical and Electrical Properties of High-Entropy Niobate (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6 with Columbite Structure
Аннотация
The high-entropy niobate (Mg0.2Cu0.2Ni0.2Co0.2Zn0.2)Nb2O6 with a columbite structure was synthesized for the first time. A modified method of combustion solutions followed by high-temperature sintering was used. According to the diffuse reflectance spectra, the band gap of the direct electronic transition is 3.36 eV. Mixed electronic-ionic conductivity was determined. The total conductivity of the sample is 2.5 · 10–3 S/cm at 750°C and is comparable to Mg0.8Cu0.2Nb2O6.



Solid-Vapor Equilibrium under Conditions of Desolvation of Solid Solutions. Topological Isomorphism with Diagrams of Polymorphic Transformations of Solid Solutions
Аннотация
The article provides a proof of analogues of the three Gibbs-Konovalov laws (Gibbs-Rosebom rules) implemented on solid–vapor phase diagrams in ternary systems under conditions of desolvation of solid solutions in the absence of a liquid phase. The topological isomorphism of the diagrams under consideration with diagrams of polymorphic transformations of solid solutions of binary systems is demonstrated, for which analogues of the Gibbs-Konovalov laws are also obtained. The proof is based on the application of generalized Van der Waals differential equations for phase equilibrium shift, written in the metrics of incomplete and full Gibbs potential of solid phases with variable composition. The applicability of the considered analogues is demonstrated by the examples of a number of model systems. Based on the established patterns for solid solution desolvation diagrams, a method for separation and purification of salt components of solid solutions is proposed.



КООРДИНАЦИОННЫЕ СОЕДИНЕНИЯ
Mixed Yttrium and Dysprosium Lactates as First Example of Rare-Earth Hydrogen-Bonded Organic Framework Solid Solutions
Аннотация
For the first time, molecular solid solutions of yttrium and dysprosium lactates of [Y1-xDyx(C3H5O3)3(H2O)2] composition, where x = 0, 0.01, 0.1, 0.5, 0.8, and 1, have been obtained. These can be considered the first solid solutions of rare-earth hydrogen-bonded organic framework (M-HOF). The obtained compounds were analyzed using a set of instrumental methods, including X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX), infrared (IR), and Raman spectroscopy. It has been shown that the unit cell volume of the lactate solid solutions linearly depends on their cationic composition. It has been established that changes in the cationic composition of the solid solutions result in a monotonic shift of the lines in the Raman spectra corresponding to Ln–O vibrations (151–158 cm–1). It has been demonstrated that the obtained compounds can be single-molecule magnets with an energy barrier of up to 108 K.



Influence of the Nature of the Central Atom on the Basicity of Octa(3,5-di-tert-butylphenoxy)phthalocyanine Complexes
Аннотация
The knowledge of the parameters and mechanisms of proton transfer from the medium to the macrocyclic ligand of highly substituted phthalocyanines complexes is necessary for the optimization of the technological processes of catalysis and creating functional materials. The complexes of octakis(3,5-di-tert-butylphenoxy)phthalocyanine with 3d-metal ions were synthesized and their acid-base reactions were studied using UV-vis and 1H NMR spectroscopy. The chemical structure of the complexes was established using elemental analysis, MALDI-TOF mass spectrometry, IR, 1H NMR and UV-vis spectroscopy. The complete protonation of Co, Ni and Cu complexes occurs in mixtures of dichloromethane – trifluoroacetic acid. The doubly and quadruple protonated forms are identified in the UV-vis spectra. The concentration ranges of existence, UV-vis parameters and thermodynamic stability constants of protonated forms were determined, as well as their relationship with the electronic structure of the coordination center.



Coordination Compounds of Yttrium(III) with Urea and Dimethylacetamide: Composition, Structure, Thermal Behavior
Аннотация
Coordination compounds of yttrium(III) nitrate with urea (Ur) and N,N-dimethylacetamide, [Y(H2O)(Ur)2(NO3)3] (I), [Y(Ur)3(NO3)3] (II) and [Y(DMAA)3(NO3)3] (III), were synthesized; their compositions, structural features and thermolysis were studied with the use of elemental analysis, IR spectroscopy, X-ray powder and single-crystal diffraction, thermal gravimetric analysis, differential scanning calorimetry. The coordination compounds can be used for the synthesis of nano-scale yttrium(III) oxide.



ФИЗИЧЕСКИЕ МЕТОДЫ ИССЛЕДОВАНИЯ
Heat Capacity and Magnetic Properties of PrMgAl11O19
Аннотация
Isobaric heat capacity of magnesium-praseodymium hexaaluminate PrMgAl11O19 with magnetoplumbite structure was measured by three calorimetric methods in the temperature range 2–1865 K. Heat capacity values were docked and smoothed to calculate thermodynamic functions (entropy, enthalpy change and derived Gibbs energy) in the mentioned temperature region. A gentle anomaly of heat capacity with a maximum of about 8 K was found, its entropy and enthalpy were calculated. Magnetic properties of PrMgAl11O19 have been studied using the method of dynamic magnetic susceptibility in the temperature range 2–300 K. Based on the results of measurements of magnetic properties, an anomaly was found on the imaginary component of dynamic magnetic susceptibility, the temperature range of which is consistent with the area of the anomaly of heat capacity.



ФИЗИКО-ХИМИЧЕСКИЙ АНАЛИЗ НЕОРГАНИЧЕСКИХ СИСТЕМ
Phase Equilibria in the Li–V–O System (Analytical Review)
Аннотация
Using the method of topological modeling and basing on fragmentary experimental data on phase equilibria and transformations, P–T–x phase diagrams of binary systems Li–V, Li–O, V–O, as well as a complete isothermal concentration diagram of the Li–V–O system, which take into account the formation of limited solid solutions and the presence of saturated vapor, were constructed for the first time.



Solid Solution in the Pseudobinary System Ba2YMoO6–[Ba2YCuO5]
Аннотация
Samples of the pseudobinary system Ba2YMoO6–[Ba2YCuO5] were synthesized using the gel combustion method. The obtained samples were studied by X-ray diffraction and photoluminescence spectroscopy. By replacing Mo with Cu, it was possible to stabilize the cubic phases Fmm and F3m of the Ba2YMo1–xCuxO6–δ solid solution (0 ≤ x ≤ 0.5) in air.



ФИЗИКОХИМИЯ РАСТВОРОВ
On Polymer Complexes of Gold(I) with Glutathione in Aqueous Solution
Аннотация
Processes involving gold(I) glutathionate complexes in aqueous solution at t = 25°C and I = 0.2 M (NaCl) in the pH range 7.20–6.06 (CAu = (5–10 × 10–4 M)) were studied. Using mass spectrometry, it was shown that at CGS > CAu, in addition to monomeric Au(GS)2*, there can exist polymeric forms Au4(GS)4*, as well as Aun(GS)n+1*, where n ≤ 4, the symbol * means the sum of forms of different degrees of protonation. From UV spectroscopy it follows that in the entire region of 0.5 < CGS/CAu < 3, spectra of four forms, including Au(GS)2*, are sufficient to describe all spectra within experimental errors in the form of a linear combination. As pH decreases, the proportion of Au(GS)2* decreases. The equilibrium constant 0.25 Au4(GSH)44– + GSH2– = Au(GSH)23– + H+ is equal to lgK = –4.4 ± 0.1 (I = 0.2 M, NaCl).



On the Interaction of Gold(III) Complexes with Methionine
Аннотация
The interaction of gold(III) complexes AuCl4–, Au(bipy)Cl2+, Au(en)23+ and Au(C9H19N4)2+ with methionine (HMet) in an aqueous solution (pH 2.0 и 7.4; I = 0.2 M (NaCl), CAu = (5–10) × 10–5 M, CHMet < (6–50) × 10–5 M) at 25°C was studied. Methionine reduces gold(III) to gold(I), but the processes proceed much more slowly (hundreds of times) than under the action of thiols. As the density of ligands in the gold(III) complex increases, the rate of reactions with HMet decreases significantly.



НЕОРГАНИЧЕСКИЕ МАТЕРИАЛЫ И НАНОМАТЕРИАЛЫ
Zirconosilicate Sorbent Based on Coal Fly Ash Cenospheres for Cesium Immobilization in a Ceramic Form
Аннотация
Hollow aluminosilicate microspheres (cenospheres) of stabilized composition (glass phase – 95.4 wt. %; (SiO2/Al2O3)glass – 3.1) isolated from fly ashes from coal combustion were used to prepare composite sorbents containing a sorption-active component based on zirconosilicates of framework structure. The synthesis products were characterized by XRD, SEM-EDS and low-temperature nitrogen adsorption methods, and their sorption properties towards Cs+ were studied. Zirconosilicate material demonstrates the high distribution coefficient in the process of Cs+ sorption from aqueous solutions (~103–104 ml/g) and stability of sorption capacity as a result of decationation. The possibility of application of SPS-synthesis technology to create high-density mineral-like ceramics for cesium immobilization based on the zirconosilicate sorbent has been investigated. The results of dilatometry, structure and porosity analyses were obtained for ceramics sintered at different temperatures (800–1000°C).



Preparation and Chemosensory Properties of Ti2CTx–10 mol. % SnO2 Composite Material
Аннотация
A hybrid method for the preparation of Ti2CTx–10 mol. % SnO2 composite material was developed, combining a deposition method in the presence of dispersed MXene accordion-like aggregates and subsequent hydrothermal treatment. As a result, the MXene multilayer was decorated by ~2–4 nm tin dioxide nanoparticles, and the interlayer spacing of the Ti2CTx MXene multilayer increased from 11.6 to 13.5 Å. For the obtained Ti2CTx–SnO2 composite material coated by microplotting, a high sensitivity of the receptor layer to 100 ppm ethanol, ammonia and nitrogen dioxide was observed already at room temperature and under conditions of 23% relative humidity. The determined high response of the nanocomposite to humidity changes allows us to consider it as a promising receptor material for a humidity sensor.



Electrochromic Properties and Preparation of Thin V2O5 Films Using Heteroligand Complexes of Vanadyl
Аннотация
Microstructural features, phase composition, and eletrochromic properties of V2O5 film formed by spin-coating using vanadyl alkoxoacetylacetonate as a precursor have been studied. The obtained material possesses a significant amount of V4+ ions, which is indicated both by the presence of the corresponding modes on the Raman spectra and the presence of the V7O16 phase. As a result, the material exhibits anodic electrochromism – it colors upon oxidation, changing color from pale blue to a much less transparent orange-yellow. The optical contrast can reach 30% at a wavelength of 400 nm, and the coloration efficiency is 65.26 cm2/C. The results of the study clearly demonstrate the promising application of materials based on V2O5, obtained using heteroligand hydrolytically active vanadyl complexes, as functional components of devices that provide a change in optical properties when an electrical voltage is applied.


