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 Найдено в других БД:Публикации Чарушина В.Н. (24)
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Общее количество найденных документов : 31
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 1-10    11-20   21-31   31-31 
1.
Инвентарный номер: нет.
   

   
    (Mechano)synthesis of azomethine- and terpyridine-linked diketopyrrolopyrrole-based polymers / W. K. A. Al-Ithawi, A. F. Khasanov, M. I. Valieva [et al.] // Chimica Techno Acta. - 2023. - Vol. 10, № 2. - P202310204
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
DIKETOPYRROLOPYRROLE-BASED POLYMERS -- PD-CATALYZED SYNTHESIS -- MECHANOSYNTHESIS
Аннотация: Three efficient synthetic approaches towards new azomethine- and terpyridine-containing 2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (diketopyrrolopyrrole, DPP) based polymers, such as P1 and P2, are reported. The first approach involves the Pd-catalyzed synthesis via two- or three-component Suzuki or Stille cross-coupling reaction in solution. The second approach involves Pd-catalyzed Suzuki cross-coupling reaction under ballmilling conditions. And, finally, the third approach involves Pd-free condensation reaction under ball-milling conditions. The newly obtained polymers exhibited absorbance around 700 nm and emission around 900 nm, and, thus, these polymers are considered to be NIR-fluorophores.

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2.
Инвентарный номер: нет.
   

   
    A BF3-mediated C–H/C–Li coupling of 1,3,7-triazapyrene with 2-thienyllithium in the design of push–pull fluorophores and chemosensors for nitroaromatics / I. A. Lavrinchenko, T. D. Moseev, M. V. Varaksin [et al.] // New Journal of Chemistry. - 2022. - Vol. 46, № 11. - P5121-5128
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Mono- and bis-2-thienyl-substituted 1,3,7-triazapyrenes have been synthesized for the first time via BF3-mediated C–H/C–Li coupling of 1,3,7-triazapyrene with 2-thienyllithium in 33 and 51% yields, respectively. The photophysical properties of these polycyclic azaaromatics have been studied, with emission in the range of 450–500 nm and fluorescence quantum yields of up to 99% in methanol solutions being revealed. The turn-off chemosensing properties of 2-thienyl-substituted 1,3,7-triazapyrenes for the selective detection of nitroaromatics have also been assessed; in particular, the quenching constants according to the Stern–Volmer model, the quenching sphere radius according to the Perrin model, the detection limit and the quenching efficiency have been determined. In particular, 6,8-bis-(thiopen-2-yl)-1,3,7-triazapyrene, characterized by 10 times the quenching constant and limit of detection (LOD) compared to the mono-substituted analog, can be considered as the most promising chemosensor for determining nitroaromatic compounds. DFT calculations confirm the presence of intramolecular charge transfer (ICT) effects in the case of the obtained fluorophores and clarify the quenching mechanism for nitroaromatics.

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3.
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    Synthesis of 5-(4-bromophenyl)- and 5-(5-bromothiophen-2-yl)-substituted 3-aryl[1,2,4]triazolo[4,3-c]quinazolines / E. V. Nosova, A. E. Kopotilova, M. A. Ivan’kina [et al.] // Russian chemical bulletin. - 2022. - Vol. 71, № 7. - P1483-1487
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A series of [1,2,4]triazolo[4,3-c]quinazolines, bearing 3-positioned p-bromophenyl or 5-bromothiophen-2-yl fragment, was synthesized by oxidative cyclization of the corresponding hydrazones with bromine in glacial acetic acid at room temperature. The obtained tricyclic derivatives are valuable intermediates for biologically active compounds and fluorophores.

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4.
Инвентарный номер: нет.
   

   
    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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5.
Инвентарный номер: нет.
   

   
    Synthesis of new water-soluble polyarene-substituted naphtho[1,2-d]oxazole-based fluorophores as fluorescent dyes and biological photosensitizers / N. V. Slovesnova, A. S. Minin, O. S. Taniya [et al.] // Dyes and Pigments. - 2022. - Vol. 204. - Ст. 110410
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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6.
Инвентарный номер: нет.
   

   
    Design and synthesis of y-shaped fluorophores based on n(2)-aryl-1,2,3 triazoles / I. A. Lavrinchenko, T. D. Moseev, Y. A. Seleznev [et al.] // Успехи синтеза и комплексообразования = Advances in synthesis and complexing : сборник тезисов шестой Международной научной конференции. - Москва, 2022. - P240
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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7.
Инвентарный номер: нет.
   

   
    Abnormal push-pull benzo[4,5]imidazo[1,2-a][1,2,3]triazolo[4,5-e]pyrimidine fluorophores in planarized intramolecular charge transfer (PLICT) state: Synthesis, photophysical studies and theoretical calculations / O. S. Taniya, V. V. Fedotov, L. K. Sadieva [et al.] // Dyes and Pigments. - 2022. - Vol. 204. - Ст. 110405
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The combination of excellent luminescence with high solvent polarity effect and aggregation induced emission (AIE) is an ideal combination for creating fluorophores/probes with high microenvironmental sensitivity. However, many push-pull chromophores of the D−A type in common intramolecular charge transfer (ICT) state with a significant solvatochromic effect and AIE activity, have poor luminescent properties. Herein, to overcome this problem by using reactions of nucleophilic aromatic hydrogen substitution (SNH), we have designed a series of novel 4-heteroaryl-substituted 2-aryl-2H-benzo[4,5]imidazo[1,2-a][1,2,3]triazolo[4,5-e]pyrimidine fluorophores possessing a planarized intramolecular charge transfer (PLICT) state. All these fluorophores exhibited high luminescence quantum yields (up to 60%) and large Stokes shift values of up to 7459 cm−1. Among them, the fluorophore 4h was found to exhibit the most pronounced positive solvatochromic effect and the probe 4f exhibited the most pronounced aggregation induced emission characteristics. This AIE behavior was further confirmed by means of time-resolved fluorescence lifetime measurements as well as DFT-assisted geometry optimization studies. In the presence of trifluoroacetic acid (TFA) compound 4h exhibited a well-pronounced acidochromism via visible color change from yellow-green to orange which returned to the original yellow-green solution after the addition of triethylamine (TEA). The Stern-Volmer constant for the probe 4h towards TFA was 38 M−1. Finally, for the compounds 4f, g, h theoretical calculations in the ground and excited states in different solvents were carried out to confirm the PLICT process. Based on all above the herein reported PLICT fluorophores 4a-h can be successfully applied as biological probes and optical switches.

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8.
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    Coumarin-pyridine push-pull fluorophores: synthesis and photophysical studies / R. F. Fatykhov, A. D. Sharapov, E. S. Starnovskaya [et al.] // Spectrochimica acta part A: molecular and biomolecular spectroscopy. - 2022. - Vol. 267. - Ст. 120499
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A series of coumarin-pyridine-based push-pull fluorophores were prepared starting from 1,2,4-triazines by using direct C-H functionalization (SNH-reaction)–Diels-Alder–retro Diels-Alder domino reaction sequence. This efficient synthetic strategy allowed to obtain a series of 19 coumarin-pyridine fluorophores. Their photophysical properties were studied. While pyridine-substituted derivatives of 4-alkylcoumarins may be considered as alternative to coumarin dyes characterized by emission maxima mainly in a visible region with wavelengths of 402–415 nm, absorption in the UV range at 210–307 nm, and good photoluminescence quantum yields of 6–19%, all the derivatives of 4-phenylcoumarin did not exhibit any noticeable fluorescence. More detailed photophysical studies were carried out for two the most representative derivatives of 4-alkyl-coumarin-pyridines to demonstrate their positive solvatochromism, and the collected data were analyzed by using Lippert-Mataga equation, as well as Kosower and Dimroth/Reichardt scales. The obtained results demonstrate that the combining two chromophore systems, such as 2,5-diarylpyridine and coumarin ones, is promising in terms of improving the photophysical properties of the new coumarin-pyridine hybrid compounds.

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9.
Инвентарный номер: нет.
   

   
    An efficient synthesis of push-pull fluorophores based on (2-fluoroaryl)-1,2,3-triazoles / I. A. Lavrinchenko, T. D. Moseev, Y. A. Seleznev [et al.] // Успехи синтеза и комплексообразования = Advances in synthesis and complexing : сборник тезисов шестой Международной научной конференции. - Москва, 2022. - P194
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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10.
Инвентарный номер: нет.
   

   
    Benzo[de]naphtho[1,8-gh]quinolines: synthesis, photophysical studies and nitro explosives detection / I. L. Nikonov, I. A. Khalymbadzha, L. K. Sadieva [et al.] // Chimica Techno Acta. - 2021. - Vol. 8, № 4. - Ст. 20218415
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BENZO[DE]NAPHTHA [1,8-GH]QUINOLONES -- FLUORESCENCE -- SENSOR -- EXPLOSIVES
Аннотация: A rational synthetic approach to substituted naphtho[1,8-gh]quinolines based on intramolecular cyclization in the presence of potassium in the series of (naphthalen-1-yl)isoquinolines is described. The photophysical properties of the obtained compounds were studied; in particular, fluorescence emission was detected in the range 454-482 nm with a quantum yield of up to 54%. We also calculated the HOMO-LUMO energies and optimized molecular structures for the resulting fluorophores. Based on the results of fluorescence titration, the Stern-Volmer constants (up to 21587 M-1) and the detection limits of nitroanalytes (up to 1.4 ppm) were calculated, confirming the possibility of their use as potential chemosensors for the visual detection of nitro-containing explosives.

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