Himiâ vysokih ènergij

ISSN(Print): 0023-1193

Media registration certificate: No. 0110274 dated 02/08/1993

Founder: Russian Academy of Sciences, Institute of Physical Chemistry RAS

Editor-in-Chief: Razumov Vladimir Fedorovich

Number of issues per year: 6

Indexation: RISC, list of Higher Attestation Commissions, CrossRef, White List (level 3)

Ағымдағы шығарылым

Ашық рұқсат Ашық рұқсат  Рұқсат жабық Рұқсат берілді  Рұқсат жабық Тек жазылушылар үшін

Том 59, № 1 (2025)

Мұқаба

Бүкіл шығарылым

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

PHOTONICS

Effect of solvents on optical properties and dynamics of exciton states in quantum dots CdZnS/ZnS doped with Mn2+
Vasin A., Dobryakov A., Kostrov A., Koroznikova E., Gostev F., Shelaev I., Antonova O., Kochev S., Nadtochenko V.
Аннотация

The dynamics of differential absorption spectra of Mn2+ : Zn0.48Cd0.52S/ZnS quantum dots (QDs) after excitation with a femtosecond (fs) pulse of 360 nm in aprotonic nonpolar cyclohexane and polar propylene carbonate solvents in comparison with the protonic polar solvent water has been studied by femtosecond laser spectroscopy method. The absorption and luminescence spectra of QDs in water revealed bands related to trapped states. The fading band related to the edge exciton of QD attenuates significantly faster in water than in aprotonic solvents, which suggests rapid electron transfer from the 1Se level to trap states in competition with electron transfer to manganese. Apparently, the competition of these processes is the reason for the decrease in the quantum yield of manganese luminescence in Mn2+ : Zn0.48Cd0.52S/ZnS when passing from aprotonic solvents to water.

Himiâ vysokih ènergij. 2025;59(1):3-11
pages 3-11 views
Quenching of gadolinium(III) ion photoluminescence in liquid ammonia by solvated electron
Abdrakhmanov A., Sharipov G., Gareev B., Yakshembetova L.
Аннотация

The effect of a solvated electron on the gadolinium(III) chloride photoluminescence in liquid ammonia at 293 K and a pressure of 8.8 atm is considered. The solubility of GdCl3 crystalline hydrate in ammonia is 5 × 10–4 M. The solvated Gd3+ ion luminescence spectrum thein this solution coincides with the hydrated Gd3+ ion luminescence spectrum in a similar aqueous solution at atmospheric pressure. The lifetime τ in the excited state (6P7/2) of the gadolinium(III) ion is longer in ammonia (2.6 ms) than in water (2.0 ms). Luminescence of (Gd3+)* in ammonia is quenched by a solvated electron (es) formed during the dissolution of lithium metal. Under these conditions, the Gd3+ and es solution is unstable, precipitates are formed, and there is a continuous change in the concentrations of the components involved in the quenching reaction (Gd3+)* + es → Gd2+. Because of this, the gadolinium ion photoluminescence intensity this not applicable to assessing the quenching efficiency by a solvated electron. The quenching efficiency (τ0–τ)/τ linear dependence the on the quencher concentration was obtained by measuring the gadolinium ion τ at a variable concentration es, which was determined from the solution optical density at 1400 nm in its absorption band. The bimolecular rate constant for the proposed quenching reaction, found from this dependence, was k = (5.3 ± 0.3) × 107 M−1 ∙ s−1.

Himiâ vysokih ènergij. 2025;59(1):12-17
pages 12-17 views
Quenching of phosphorescence of triple complexes of naphthalene-β-cyclodextrin-cyclohexane with oxygen
Makhrov D., Ionov D., Ionova I., Alfimov M.
Аннотация

The process of quenching of long-lived phosphorescence of ternary complexes naphthalene-β-cyclodextrin-cyclohexane, localized in the matrix of double complexes β-cyclodextrin-cyclohexane, in aqueous suspension of crystalline hydrates and powder formed by drying of crystalline hydrates has been studied. In the suspension, the phosphorescence kinetics are monoexponential and the quenching is dynamic; the bimolecular quenching constant is equal kq = 0.87 × 105 s–1M–1. In the powder, the phosphorescence kinetics are not monoexponential, which is apparently due to the different surrounding structure of the naphthalene molecules. The inhomogeneity of the environment is expressed in the presence of a distribution of the rate constants of radiation-free processes and a decrease in the availability of naphthalene molecules for interaction with oxygen.

Himiâ vysokih ènergij. 2025;59(1):18-25
pages 18-25 views

ФОТОХИМИЯ

Spectral and photochemical properties of dipyrenylcyclobutanes formed in the [2+2]-photocycloaddition reaction from biphotochromic dyads
Budyka M., Li V., Gavrishova T.
Аннотация

The properties of dipyrenylcyclobutanes CB10 and CBoX, which are products of the [2+2]-photocycloaddition reaction (PCA) of the corresponding biphotochromic dyads D10 and DoX, have been studied. The absorption and fluorescence spectra of cyclobutane CBoX revealed the presence of different types of pyrene substituents, with strong and weak interactions in the ground S0 and excited S1 states. In both cyclobutanes, energy transfer (ET) from the pyrenyl substituents to the cyclobutane rings is observed, initiating the cyclobutane opening reaction (retro-PCA), which occurs via a predissociation mechanism. The photochromic pair “D10-CB10 is an example of a new type of photochrome operating by the mechanism of the PCA reaction and can function as a two-channel color-correlated fluorescent photoswitch.

Himiâ vysokih ènergij. 2025;59(1):26-38
pages 26-38 views

ФОТОКАТАЛИЗ

Study of the influence of ultraviolet irradiation on the properties of CO catalyst based on titanium dioxide, plasma-chemical titanium carbonitride and palladium
Vershinin N., Balikhin I., Kabachkov E., Kurkin E.
Аннотация

A CO catalyst based on TiO2 was synthesized with additions of 10 wt % TiC0.2N0.8 and 10 wt % Pd. The catalyst was tested by TEM, X-ray photoelectron spectroscopyand X-ray patterns. The effect of UV radiation on catalytic properties was investigated and long-term tests were carried out for 100 days. UV radiation was found to increase the rate of the CO oxidation reaction, decrease the activation energy of the reaction rate constant, and increase the long-term stability of the catalytic properties. The activation energy of the reaction rate constant is determined in the temperature range from 288 to 308 K, which is equal to 23 ± 1 kJ/mol under UV illumination of the catalyst. The catalyst has good prospects for use in photocatalytic air cleaners.

Himiâ vysokih ènergij. 2025;59(1):39-45
pages 39-45 views
Photochemical oxidation of water catalyzed by a cobalt (II) tetra-nuclear complex with polyoxovolphramophosphate ligands and lithium antications in artificial photosynthesis
Dzhabieva Z., Ilyaschenko V., Savinykh T., Dmitriev A., Zhidkov M., Baskakova Y., Dzhabiev T.
Аннотация

Lithium salt of cobalt tetra-nuclear complex was synthesized and characterized by physicochemical methods Li10[Co4(H2O)2(α-PW9O34)2] 24H2O (1) – active homogeneous catalyst for the reaction of water oxidation with the formation of О2. ESI – mass spectrometric method shows the presence in the mass spectrum of the maximum peak with m/z = 1182.611 corresponding to the ion [Co4(PW9O34)HLi5]4– which forms a sandwich-type structure. Measurements of temperature-dependent magnetic susceptibility showed the predominance of antiferromagnetic interaction in the complex 1. The photochemical oxidation reaction of water under visible light irradiation in the presence of electron acceptor was studied Na2S2O8, photosensitizer bpy3RuCl2 and the catalyst. Efficiency of the catalytic system under optimal reaction conditions (рН 8, [1] = 5 μM), catalyst turnover number TON = 330, quantum yield of photogenerated oxygen (F = 0.46) is higher than that of the sodium salt of a similar catalyst (TON = 220, F = 0.27).

Himiâ vysokih ènergij. 2025;59(1):46-52
pages 46-52 views
Photochemical oxidation of antibacterial drugs in the presence of oxygen-containing additives
Lyubushkin T., Ivancova N., Kuzin E., Tikhonova V.
Аннотация

The article deals with the photochemical oxidation of nitrofural and tetracycline in the presence of oxygen-containing additives (hydrogen peroxide, peroxydisulfuric acid, potassium persulfate). It was found that the addition of oxygen-containing additives significantly increases the efficiency and rate of APS degradation. The highest degradation efficiency is achieved using hydrogen peroxide, but the high cost of the reagent allows us to consider peroxydisulfuric acid and potassium persulfate as potential alternatives.

Himiâ vysokih ènergij. 2025;59(1):53-58
pages 53-58 views

RADIATION CHEMISTRY

Preparation and properties of propylene oxide fluorotelomers
Kim I., Shestakov A., Shulga Y., Gak V., Allayarov S.
Аннотация

Telomeres are formed under the action of gamma rays from a 60Co source at room temperature in solutions of tetrafluoroethylene in propylene oxide with concentrations of 0.08–4.2 mol/L; telomer chain length depends on the monomer content in the solution. Monomer consumption during irradiation was controlled calorimetrically and gravimetrically; its complete conversion is observed at irradiation doses of 10–15 kGy. Molecular-mass characteristics of radiolysis products were determined by thermogravimetry. The telomeres with chain length less than 6 form true solutions. At the degree of monomer polymerization 6–15 colloidal solutions are formed, at more than 15 – dense gels. In the structure of propylene oxide fluorotelomer, the end functional epoxy group is retained. The morphology of the coating layers was investigated by atomic force microscopy.

Himiâ vysokih ènergij. 2025;59(1):59-68
pages 59-68 views

ПИСЬМА В РЕДАКЦИЮ

Charge characteristics of structurally complex titanocene by the NBO method
Loukova G., Milov A.
Himiâ vysokih ènergij. 2025;59(1):69-72
pages 69-72 views

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