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Общее количество найденных документов : 43
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1.
Инвентарный номер: нет.
   


   
    Bacterial degradation of PCB 70 and its hydroxy derivatives is an environmentally friendly way to destroy pops / T. D. Kir'yanova, D. O. Egorova, T. I. Gorbunova, M. G. Pervova // Bio Web of Conferences : International Scientific and Practical Conference “Innovations, Technological Solutions and Management in Modern Biotechnology and Biomedicine” (ITSM-2022). - Pushchino, 2023. - P09002
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: One of the problems of our time is the environmentally safe destruction of polychlorinated biphenyls (PCBs) and their hydroxylated derivatives. The aim of the study was to investigate the features and prospects of the decomposition of PCB 70 (2,5,3',4'-tetrachlorobiphenyl) and hydroxylated chlorobiphenyls derived from it by Rhodococcus wratislaviensis strain CH628. As a result of the application of methods of periodic cultivation, gas chromatography and light spectrometry, it was found that the efficiency of destruction of PCB 70 1 g of cells of strain CH628 was 90 mg PCB/day, and the same indicator for a mixture consisting of hydroxy derivatives obtained from PCB 70 was 56 mg PCB/day. It was shown that the strain uses all components of the mixture of hydroxy-PCB 70 as a growth substrate, but with different degradation rates. When cultivated in a mineral medium with PCB 70 or a mixture of hydroxy-PCB 70, strain CH628 forms biofilms. The analysis of the obtained results shows that the use of the Rhodococcus wratislaviensis CH628 strain will make it possible to develop a technology for the environmentally safe destruction of PCB 70 and hydroxy-PCBs derived from it.

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2.
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    Fluoroaromatic 2H-imidazole-based push-pull fluorophores: Synthesis, theoretical studies, and application opportunities as probes for sensing the pH in saliva / T. D. Moseev, M. V. Varaksin, E. A. Virlova [et al.] // Dyes and Pigments. - 2022. - Vol. 202. - Ст. 110251
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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3.
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    (A)symmetric chromophores based on cyano and fluorine-substituted 2,3-bis(5-arylthiophen-2-yl)quinoxalines: Synthesis, photophysical properties and application prospects / T. N. Moshkina, E. V. Nosova, A. E. Kopotilova [et al.] // Dyes and Pigments. - 2022. - Vol. 204. - Ст. 110434
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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4.
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    Modification and application of 1,2,5-oxadiazolo[3,4-b]pyrazine derivatives: highlights and perspectives / Yu. A. Kvashnin, E. V. Verbitskiy, G. L. Rusinov, V. N. Charushin // Russian chemical bulletin. - 2022. - Vol. 71, № 7. - P1342-1362
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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5.
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    N-Substituted-3-aminopropylsilsesquioxanes: synthesis, physicochemical properties, and application / M. E. Evseev, A. S. Kholmogorova, L. K. Neudachina [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 6. - P1154-1160
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SILSESQUIOXANES -- SOL-GEL -- CARBON PASTE ELECTRODES -- RUBEANIC ACID -- DETERMINATION OF SILVER(I)
Аннотация: Synthesis and study of the physicochemical properties of silsesquioxanes modified with 3-aminopropyl, 2-aminoethyl-3-aminopropyl, and dithiooxamide groups was carried out. The obtained sorbents were characterized by thermal stability, porosity, and a high degree of functionalization; the concentration of groups grafted to the particle surface reached 2.80 mmol g−1. Modified silsesquioxanes were used as an electroactive substance for the development of indicator carbon paste electrodes (CPEs). When using a CPE with a 5% dithiooxamidated silsesquioxane content, the conditions selected for potentiometric titration of aqueous solutions containing silverI were pH 3–4, the titrant was potassium iodide. The designed sensor was successfully tested by analyzing a standard sample and a drug for silver ion content.

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6.
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   P 58


   
    Photophysics, photochemistry and bioimaging application of 8-azapurine derivatives / A. K. Eltyshev, I. A. Agafonova, A. S. Minin [et al.] // Organic & biomolecular chemistry. - 2021. - Vol. 19, № 45. - P9880-9896
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: New 2-aryl-1,2,3-triazolopyrimidines were designed, synthesized, and characterized. Their optical properties were thoroughly studied in the solid phase, in solution and in a biological environment. Density Functional Theory (DFT) based calculations were performed, including the molecular geometry optimization for both the ground state and the first singlet excited state, the prediction of the UV-Vis absorption and fluorescence spectra, the determination of the molecular electrostatic properties and the solvent effect on the optical properties. The emission intensity was revealed to increase in time upon irradiation. Mass spectrometric research, quantum mechanical calculations, and analysis of literature data suggested a possible photo-transformation pathway through the homolytic cleavage of one of the C–Cl bonds upon irradiation with UV light. The structure of the active intermediate was identified by the series of mass spectrometry experiments and via synthesis of putative transformation products. The kinetic parameters measured in different solvents allowed estimating the rate of these photo-transformations. Biological experiments demonstrated that 2-aryl-1,2,3-triazolopyrimidines penetrate cells and selectively accumulate in the cell membrane and the Golgi complex and endoplasmic reticulum. Their unique properties pave the way for new possible applications of fluorescent 8-azapurines in biology and medicine.

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7.
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    Application of aluminum diketonates in polymerization catalysisε-caprolactone / Y. V. Solovyova, I. S. Puzyrev, A. V. Pestov // Mendeleev 2021: book of abstracts XII international conference on chemistry for young scientists. - Saint Petersburg, 2021. - С. 778
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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8.
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    Oxidizing agents in metal-catalyzed and metal-free C-H functionalization of heteroarenes / I. A. Utepova, O. N. Chupakhin, M. A. Trestsova [et al.] // Arkivoc. - 2021. - № 9. - P240-299
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
DIRECT С-H FUNCTIONALIZATION -- HETEROARENE -- OXIDIZING AGENTS
Аннотация: Oxidative C-H functionalization represents a crucial method to make new C-C, C-X (X = heteroatom) bonds. An optimal selection of the oxidizing agent goes hand in hand with the insight into the reaction mechanism. This review covers recent advances in methods of direct oxidative C-H functionalization of azines and their derivatives with heteroaromatic nucleophiles. Also we review the data on application of inorganic and organic oxidants for implementation of these reactions. C-H functionalizations under electrochemical and photocatalytic oxidation conditions are included as well.

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9.
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    1,2,4,5-Tetrazine derivatives as components and precursors of photo- and electroactive materials / G. N. Lipunova, E. V. Nosova, G. V. Zyryanov [et al.] // Organic chemistry frontiers. - 2021. - Vol. 8, № 18. - P5182-5205
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Extensive research on the synthesis and application of tetrazine derivatives for electronic devices, luminescent elements, photoelectric conversion elements, and image sensors has been published recently. This review covers reported data on the modern trends in the design of functionalized tetrazines obtained within the period 2010–2020. Aryl(heteroaryl) and arylvinyl derivatives of tetrazines and their photoluminescence and application for fluorogenic probes are discussed. Examples of photosensitive oligomers and polymer 3,6-dithienyltetrazines are reviewed.

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10.
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    New naphtho[1,8-ef]perimidines: synthesis, fluorescence studies and application for detection of nitroanalytes / I. L. Nikonov, L. K. Sadieva, M. I. Savchuk [et al.] // Chimica Techno Acta. - 2021. - Vol. 8, № 4. - Ст. 20218416
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
NAPHTHO[1,8-EF]PERIMIDINES -- FLUORESCENCE -- SENSOR -- EXPLOSIVES
Аннотация: A rational approach to the synthesis of substituted naphtho[1,8-ef]perimidines based on SNH methodology and cyclization reaction in the series of condensed azines with naphthalene substituents was presented. Photophysical properties of the obtained fluorophores were studied, in particular, green fluorescence in the 485–536 nm range with quantum yield up to 32.4% was detected. HOMO-LUMO energy values and distributions for the new compounds were calculated by the DFT method in comparison with nitroanalytes and perylene. Based on the data obtained, as well as on the results of fluorescence titration, the possibility of using the new diazaperylenes as potential chemosensors for the visual detection of nitro-containing explosives was shown.

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