Russian Journal of Inorganic Chemistry最新文献

This study focuses on the design and characterization of two phthalocyanine molecules, 1,8(11),15(18),22(25)-tetra-(3,5-di-tert-butylphenoxy)phthalocyaninato indium(III)acetate (In-4) and 1,8(11),15(18),22(25)-tetra-(3,5-di-tert-butylphenoxy)phthalocyaninatooxotitanium(IV) (Ti-5). The composition of the complexes was confirmed by the methods on the basis of UV-Vis, FTIR and ¹H NMR spectroscopies as well as elemental analyse and Maldi Tof techniques. Investigating the photochemical and photophysical properties of both axial metal complexes revealed a notably high singlet oxygen quantum yield. Density functional theory (DFT) calculations are used to rationalise the relative stability and photophysical properties of these complexes. The effects of the In-4 complex on cervical cancer were assessed through mitochondrial dehydrogenase activity, which indicated an IC₅₀ at a concentration of 100 µM. Analysis of cell index data suggested the initiation of the cell death pathway, accompanied by DNA damage. Subsequent evaluation of the mitotic index was showed a decrease over time. These findings suggest the potential successful utilization of the In-4 complex in thephotodynamic therapy of cervical cancer. This novel research highlights both the PDT properties of phthalocyanines and the antiproliferative effects of the In-4 complex on HeLa cells.

The sensory properties of h-Co_xWO₃ (0 ≤ x ≤ 0.09) and h-W_{1 – x}Fe_xO₃ (0 ≤ x ≤ 0.06) solid solutions, as well as m-WO₃, have been studied in relation to various toxic gases at the maximum permissible concentrations in the air. Doping h-WO₃ with Co²⁺ or Fe³⁺ ions does not affect the sensitivity of the sensory response to CH₃COCH₃ and NH₃ but leads to a decrease in the sensory signal towards NO₂. A comparative analysis of the sensory properties of hexagonal and monoclinic tungsten trioxide has been performed. When detecting CH₃COCH₃ and NH₃, the sensitivity of h-WO₃ is, respectively, ~1.5 and ~1.3 times higher than that of m-WO₃. The oxygen vacancy concentration and pore volume are the key parameters responsible for the higher sensitivity of m-WO₃ to NO₂ compared to h-WO₃.

Coordination compounds of rare-earth nitrates with N,N-dimethylacetamide (DMAA) with the compositions [Sc(H₂O)(DMAA)₂(NO₃)(μ-OH)₂Sc(NO₃)(DMAA)₂(H₂O)](NO₃)₂, [La(DMAA)₄(NO₃)₃], [Ce(DMAA)₅(NO₃)₂][Ce(DMAA)₂(NO₃)₄], and [Ln(DMAA)₃(NO₃)₃] (Ln = Pr, Nd, Sm–Lu, Y) have been synthesized. Using elemental analysis, IR spectroscopy, single-crystal and powder X-ray diffraction techniques, as well as TGA-DSC analysis, their compositions and structural features were determined; thermal decomposition of the compounds was studied in a wide temperature range (50–900°C). Complexes [Ln(DMAA)₃(NO₃)₃] form two isostructural series: crystals with Ln = Pr–Dy belong to the monoclinic symmetry, and crystals with Ln = Ho–Lu, Y belong to the orthorhombic symmetry. It is shown that the coordination compounds can be used as precursors for the production of nanoscale REE oxides (from 12 to 50 nm) with a specific surface area of 18–65 m²/g.

For the first time, a cryoprotectant based on a glass-forming aqueous solution of magnesium acetate—a metal essential for the human body—has been obtained and studied using DSC analysis. This cryoprotectant, Mg(CH₃COO)₂∙12H₂O, surpasses existing analogs in the following aspects: it has a high glass-forming ability (transitions from the glassy state to liquid without crystallization), is non-toxic, and is easily produced. Its cryoprotective ability, demonstrated using chicken egg white, is independent of cooling and heating rates. It has been shown that the Mg(CH₃COO)₂–H₂O system contains five additional potential cryoprotectants and a preservative suitable for the hypothermic storage of biological material. Using density functional theory (DFT), the molecular mechanism preventing damage and death of biological material placed in favorable cryopreservation solutions of the Mg(CH₃COO)₂–H₂O system has been established.

Samples of NASICON glass ceramics have been prepared by pyrolysis of a mixture of organic solutions in rosin melt. The phase formation, morphology, and characteristics of prepared silicophosphates have been discussed. A glass ceramics formed from precursor with molar component ratio Na : Zr : Si : P = 3 : 1.33 : 2 : 1 has been used for the study. Effect of additional phosphorus amount on the phase composition of sample has been investigated. It has been found that precursor of 3 : 1.33 : 2 : 1.15 composition produces densely sintered glass ceramics containing crystalline phase of Na₃Zr₂Si₂PO₁₂ composition. Product composition has been confirmed by unit cell parameters calculated by the Rietveld method. The samples have been obtained at 1000 and 1100°C without pressing and show 85 and 88% density of theoretical value, respectively. Conclusion has been drawn that not involved in crystal lattice Na, Si, and P take part in the formation of X-ray amorphous phase and provide conditions for NASICON formation by the type of liquid-phase sintering. A comparison of properties of Na₃Zr₂Si₂PO₁₂ ceramics obtained from Zr-deficient and non-deficient precursors has been made. It has been shown that glass phase formed in the intergrain space of Zr-deficient samples deteriorates the values of material conductivity.

Precursors of composition Ni_1–2хMn_хCo_хO_y, where x = 0–0.5, have been prepared by solution combustion synthesis. The phase composition of precursors have been confirmed by X-ray powder diffraction. Samples morphology has been studied by scanning electron microscopy in combination with energy-dispersive analysis. Change in the phase composition of precursors of mixed d-metal oxides depending on synthesis conditions and annealing temperatures has been studied. NiO, Ni, and MnCo₂O₄ content in Ni_1–2хMn_хCo_хO_y precursors composition after solution combustion synthesis (SCS) and after 550°C have been studied. Dependence of parameter a of crystal lattice of spinel phase on the composition of sample after annealing at 550, 800, and 900°C has been determined. Precursor Ni_1–2хMn_хCo_хO_y (x = 0.1–0.333) is monophase after annealing at 550°C.

Hydrophilic colloidal particles of cadmium sulfide CdS were prepared by chemical condensation. The approach used to create hydrophilic shells comprised the formation of a micelle-like structure around CdS nanoparticles (NPs) provided by the surface cadmium atoms forming stable complexonates with ethylenediaminetetraacetic acid anions. The aggregation stability mechanism of CdS NPs in aqueous solutions was studied. Optical, spectral, and photocatalytic properties of both nanostructured powders agglomerated from hydrophobic CdS nanoparticles and isolated hydrophilic CdS nanoparticles in a colloidal solution were investigated.

A novel chromic Cd(II) host-guest coordination polymer [Cd(PTA)_0.5Cl](Bcbpy)_0.5 (1) has been synthesized through the self-assembly of CdCl₂·2.5H₂O, H₄PTA (pyromelliticacid), and Bcbpy·2Cl (1,1'- bis(3-cyanobenzyl)-[4,4'-bipyridine]-1,1'-diium). Complex 1 exhibits rarely properties of photochromism and thermochromism, which arise from electron transfer progress and form the viologen radicals. Meanwhile, photo- and thermoluminescence properties of complex 1 was studied.

Molten-salt titanation of core–shell C/SiC composite fibers was carried out. A KCl, LiCl, and K₂TiF₆ mixture was used as the reaction medium; the titanating agent was metallic titanium powder. The titanation conditions were 800°C and a stationary argon atmosphere. Ceramics were manufactured from the titanated fibers by hot pressing. The microstructure and phase composition of the fibers and hot-pressed samples were investigated. Ti₅Si₃ and TiC phases were found to be formed upon titanation, and the Ti₅Si₃ phase reacted with the carbon core of C/SiC composite fibers during hot pressing to yield titanium carbide TiC as a titanium-containing product. The increasing degree of titanation was found to decrease the porosity and insignificantly increase the strength of the hot-pressed ceramics.

Solid solutions based on fluorite-like phase in systems Pr_5–xMe_xMo₃O_16+δ, where Me = Cd, Pb, have been obtained by solid-phase synthesis from metal oxides. The phase content after calcination at 1000°C has been studied by X-ray powder diffraction; the substitution limits and the dependences of the unit cell parameter on the composition of the systems have been determined. The parameters of the crystal structure of solid solutions have been specified by the Rietveld method. The influence of magnesium oxide additives on the sinterability of cadmium-containing solid solutions has been established. Isomorphous substitution of praseodymium by lead and cadmium has been found to result in a decrease in the conductivity value of the samples in the studied systems.