Russian Journal of Inorganic Chemistry最新文献

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 in 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.

The reaction of nucleophilic addition of isomers of iodaniline to the nitrile derivative of the closo-decaborate anion has been studied. The structures of the products have been determined using multinuclear NMR and IR spectroscopy, as well as ESI mass spectrometry. The structure of compound (NBu₄)[2-B₁₀H₉NHC(CH₃)HN(2-C₆H₄I)] was determined by single-crystal X-ray diffraction.

The reactions of gold(III) complexes ({text{AuCl}}_{4}^{ - }), Au(bipy)Cl(_{2}^{ + }), Au(en)(_{2}^{{3 + }}), and Au(C₉H₁₉N₄)²⁺ with methionine (HMet) were studied in aqueous solutions (pH 2.0 and 7.4; I = 0.2 M (NaCl), C_Au = (5–10) × 10^–5 mol/L, C_HMet < (6–50) × 10^–5 mol/L) at 25°C. Methionine reduces gold(III) to gold(I), but the reactions proceed much more slowly (by hundreds of times) than under the action of thiols. The rate of reactions with HMet markedly decreases with increasing denticity of ligands in the gold(III) complex.

We used topological modeling based on fragmentary experimental data on phase equilibria and phase transformations to construct for the first time P–T–x diagrams for Li–V, Li–O, and V–O binary systems and a complete isothermal concentration diagram of the Li–V–O system, the latter taking into account the formation of limited solid solutions and the presence of saturated vapor.

The study addresses reactions involving gold(I) glutathione complexes in aqueous solutions at T = 25°C and I = 0.2 M (NaCl) in the pH range of 7.20–6.06 (C_Au = (5–10) × 10^–4 M). Using mass spectrometry, it was shown that at C_GS > C_Au, polymeric species ({text{A}}{{{text{u}}}_{{text{4}}}}({text{GS}})_{4}^{*}) and ({text{A}}{{{text{u}}}_{n}}({text{GS}})_{{n + 1}}^{*}), where n ≤ 4, can exist, together with monomeric ({text{Au}}({text{GS}})_{2}^{*}) (the symbol * means the sum of species with different degrees of protonation). According to UV spectroscopy data, in the range of 0.5 < C_GS/C_Au < 3, all spectra can be described, within the experimental error, as linear combinations of the spectra of four species, including ({text{Au}}({text{GS}})_{2}^{*}). The proportion of ({text{Au}}({text{GS}})_{2}^{*}) decreases with decreasing pH. The equilibrium constant for 0.25 ({text{A}}{{{text{u}}}_{{text{4}}}}({text{GSH}})_{4}^{{4 - }}) + ({text{GSH}}_{2}^{ - }) = ({text{Au}}({text{GSH}})_{2}^{{3 - }}) + H⁺ amounts to log K = –4.4 ± 0.1 (I = 0.2 M, NaCl).

Yttrium(III) complexes with carbamide (Ur) and N,N-dimethylacetamide (DMAA) of composition [Y(H₂O)(Ur)₂(NO₃)₃] (I), [Y(Ur)₃(NO₃)₃] (II), and [Y(DMAA)₃(NO₃)₃] (III) have been synthesized. Their composition, structural features, and thermolysis processes in a wide temperature range have been determined using physicochemical methods (elemental analysis, IR spectroscopy, X-ray powder diffraction, single-crystal X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry). It has been shown that the isolated complexes can be used for the synthesis of nanosized yttrium oxide.

The photochemical behavior of substituted phthalimides with carboxylate groups associated with the cymantrenyl fragment is studied by infrared spectroscopy (IR), nuclear magnetic resonance (NMR) spectroscopy, UV-visible spectroscopy, and cyclic voltammetry (CV). During the formation of hemilabile dicarbonyl chelate complexes, a sharp change in the electronic, electrochemical, and optical properties of compounds is observed. According to the dynamic light scattering (DLS) method, further irradiation of solutions of these complexes leads to the formation of previously undescribed stable nanoparticles in liquid media containing manganese in two degrees of oxidation Mn²⁺/Mn⁺ and a phthalimide fragment associated with a Cp-ring coordinated or uncoordinated with manganese(I).

A hybrid method for the preparation of Ti₂CT_x–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 Ti₂CT_x MXene multilayer increased from 11.6 to 13.5 Å. For the obtained Ti₂CT_x–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.

Molecular solid solutions of yttrium and dysprosium lactates of composition [Y_1–xDy_x(C₃H₅O₃)₃(H₂O)₂], where x = 0, 0.01, 0.1, 0.5, 0.8, and 1, have been obtained for the first time. These solutions can be considered as the first examples of REE coordination compounds formed due to hydrogen bonding. The obtained compounds have been analyzed by the set of physicochemical methods including XRD, energy dispersive X-ray (EDX), IR, and Raman spectroscopy. Unit cell volume of solid solutions shows linear dependence on cationic composition. It has been found that variation in the cationic composition of solid solutions leads to the monotonic shift of position of lines in Raman spectra corresponding to vibrations of Ln–O bonds (151–158 cm^–1). It has been shown that the obtained compounds can behave as single-molecule magnets with magnetization barrier up to 108 K.

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 structures of the products have been 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] has been established by single crystal X-ray analysis.