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Общее количество найденных документов : 25
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1.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis, Photophysical and Redox Properties of the D-pi-A Type Pyrimidine Dyes Bearing the 9-Phenyl-9H-Carbazole Moiety [Electronic resource] / E. V. Verbitskiy [и др.] // Journal of Fluorescence. - 2015. - Vol. 25, № 3. - С. 763-775. - Bibliogr. : p. 774-775 (51 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
PYRIMIDINES -- CARBAZOLE -- DYE-SENSITIZED SOLAR CELLS
Аннотация: Novel donor-pi-acceptor dyes bearing the pyrimidine unit as an electron-withdrawing group have been synthesized by using combination of two processes, based on the microwave-assisted Suzuki cross-coupling reaction and nucleophilic aromatic substitution of hydrogen. Spectral properties of the obtained dyes in six aprotic solvents of various polarities have been studied by ultraviolet-visible and fluorescence spectroscopy. In contrast to the absorption spectra, fluorescence emission spectra displayed a strong dependence from their solvent polarities. The nature of the observed long wavelength maxima has been elucidated by means of quantum chemical calculations. The electrochemical properties of these dyes have been investigated by using cyclic voltammetry, while their photovoltaic performance was evaluated by a device fabrication study. The experimental and calculation data show that all of the dyes can be regarded as potentially good photosensitizers for dye-sensitized solar cells.

\\\\expert2\\nbo\\Journal of Fluorescence\\2015, v.25, p.763-775.pdf
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2.
Инвентарный номер: нет.
   
   A 67

   
    Application of chitosan and its N-heterocyclic derivatives forpreconcentration of noble metal ions and their determination usingatomic absorption spectrometry / Yu. A. Azarova, A. V. Pestov, A. Yu. Ustinov, S. YU. Bratskaya // Carbohydrate Polymers. - 2015. - Vol. 134. - С. 680-686
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHITOSAN -- N-HETEROCYCLIC DERIVATIVES -- SPECTROMETRY

\\\\expert2\\NBO\\Carbohydrate Polymers\\2015, v. 134, p. 680.pdf
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3.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis and properties of new π-conjugated imidazole/carbazole structures / R. A. Irgashev, N. A. Kazin, N. I. Makarova, I. V. Dorogan, V. V. Malov, A. R. Tameev, G. L. Rusinov, A. V. Metelitsa, V. I. Minkin, V. N. Charushin // Dyes and Pigments. - 2017. - Vol. 141. - P512-520
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
IMIDAZOLES -- CARBAZOLES -- ABSORPTION SPECTRA -- PHOTOLUMINESCENCE -- TDDFT CALCULATIONS -- CHARGE MOBILITY
Аннотация: New 3-(1H-imidazol-2-yl)-9H-carbazoles and 6,6′-di(1H-imidazol-2-yl)-9H,9′H-3,3′-bicarbazoles have been prepared, starting from 9-ethyl-9H-carbazole-3-carbaldehyde or 9,9′-diethyl-9H,9′H-[3,3′-bicarbazole]-6,6′-dicarbaldehyde through their reactions with 4-methoxyaniline or 4-fluoroaniline, benzil or 2,2′-thenil [1,2-di(thien-2,2′-yl) glyoxal] and ammonium acetate on reflux in glacial acetic acid. The obtained compounds have been shown to demonstrate an effective fluorescence in the blue spectral region, exhibiting quantum yields in the range of 0.08–0.51, depending on their molecular structure and solvent polarity. The nature of the observed absorption spectra has been elucidated by the TDDFT calculations.

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4.
Инвентарный номер: нет.
   
   D 64

   
    Dithienoquinazolines – A Convenient Synthesis by the Oxidative Photocyclization of 4,5-Dithienyl-Substituted Pyrimidines and Their Photophysical Properties [Electronic resource] / E. V. Verbitskiy, P. A. Slepukhin, M. S. Valova, E. M. Cherprakova, A. V. Schepochkin, G. L. Rusinov, V. N. Charushin // European Journal of Organic Chemistry. - 2014. - № 36. - С. 8133-8141
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
DITHIENOQUINAZOLINES -- PYRIMIDINES -- PHOTOPHYSICAl PROPERTIES
Аннотация: A convenient route to a new class of thienoacene systems bearing a fused pyrimidine ring is presented along with their optoelectronic properties. The photophysical and electrochemical properties of these newly developed thieno-aza-acenes have been investigated by UV/Vis absorption and photoluminescence spectrophotometry and cyclic voltammetry, and some crystal structures have also been determined.

\\\\expert2\\nbo\\European Journal of Organic Chemistry\\2014, № 36. p.8133-8141.pdf
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5.
Инвентарный номер: нет.
   
   S 89

   
    Structure and photoluminescent properties of 2-methyl-6,7-difluoro-8-hydroxyquinoline [Electronic resource] / G. N. Lipunova, E. V. Nosova, J. O. Subbotina, M. S. Valova, V. N. Charushin // Russian Journal of General Chemistry. - 2015. - Vol. 85, № 7. - С. 1629-1634. - Bibliogr. : p. 1634 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
2-METHYL-6,7-DIFLUORO-8-HYDROXYQUINOLINE -- ABSORPTION SPECTRUM -- EXCITATION SPECTRUM
Аннотация: The effect of fluorine atoms in the benzene ring on the photophysical properties of 2-methyl-6,7-difluoro-8-hydroxyquinoline is studied.

\\\\expert2\\nbo\\Russian Journal of General Chemistry\\2015, V. 85, N 7, p. 1629-1634.pdf
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6.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis, photochemical and luminescent properties of (E)-2-(2-hydroxyarylethylene)-3-phenylquinazolin-4(3H)-ones [Electronic resource] / I. G. Ovchinnikova, G. A. Kim, E. G. Matochkina, M. I. Kodess, N. V. Barykin, O. S. Eltsov, E. V. Nosova, G. L. Rusinov, V. N. Charushin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2015. - Vol. 63, № 11. - С. 2467-2477. - Bibliogr. : p. 2477 (22 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
(E)-2-STYRYLQUINAZOLIN-4(3H)-ONES -- LUMINESCENCE -- ORTHO-HYDROXYSTYRYLQUINAZOLINONES
Аннотация: Photoinduced transformations of 2-styrylquinazolinones in solutions were studied using absorption and NMR spectroscopy methods. A possibility of control of the photochemical isomerization rate of quinazolinone 2-(hydroxyaryl)ethenyl derivatives by changing the pH of the medium was demonstrated. The bases and the solvent nature also affect the luminescence intensity of solutions of these compounds in the wavelength range of 550-650 nm. The differences in the steric organization of the ortho-hydroxystyryldiazinone system in crystals and in solutions related to the turn of the aryl group were found. Their influence on the competing processes of luminescence and photochemical transformation of the ethylene fragment were shown. The fact of reversible photo/thermal E-Z-isomerization was established for (E)-2-(2-hydroxystyryl)-3-phenylquinazolin-4(3H)-one.

\\\\expert2\\nbo\\Russian Chemical Bulletin\\2015, 63 (11), 2467-2477.pdf
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7.
Инвентарный номер: нет.
   

   
    New 2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-2,2’-bipyridine-based co-polymer, synthesis, photophysical properties and response to metal cations / A. P. Krinochkin, M. I. Savchuk, E. S. Starnovskaya [et al.] // Chimica Techno Acta. - 2021. - Vol. 8, № 4. - Ст. 20218417
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SONOGASHIRA COUPLING -- POLYMER -- MONOAZATRIPHENYLENE -- 3,6-DI(THIOPHEN-2- YL)PYRROLO[3,4-C]PYRROLE- 1,4(2H,5H)-DIONE
Аннотация: A new co-polymer based on fragments of 2-(2-pyridyl)monoazatriphenylene and 2,5-bis (2-ethylhexyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione was prepared by using the Sonogashira reaction. The photophysical properties of the polymer were studied. The presence of a strong bathochromic shift of the absorption and emission maxima in comparison with the previously described monomer units is shown. The polymer exhibits an intense “turn-off” response toward Cu2+ cations.

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8.
Инвентарный номер: нет.
   

   
    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.
   

   
    Conjugates of 8-[2,2’-bipyridinyl]coumarins as potential chemosensors for Al3+, Cu2+, Cd2+, Zn2+ ions: synthesis and photophysical properties / A. D. Sharapov, R. F. Fatykhov, I. A. Khalymbadzha [et al.] // Chimica Techno Acta. - 2023. - Vol. 10, № 4. - P202310417
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHEMOSENSORS -- COUMARINS -- 2,2’-BIPYRIDINES
Аннотация: In this work, we report the synthesis of novel coumarin-bipyridine conjugates using a sequence of C-C coupling reaction between 5,7-dimethoxycoumarins and 3-pyridyl-6-aryl-1,2,4-triazines followed by the Boger reaction with norbornandiene to obtain 8-[2,2'-bipyridyl]-5,7-dimethoxycoumarins. Photophysical properties were investigated for the obtained series of 8-[2,2'-bipyridyl]-5,7-dimethoxycoumarins: absorption and emission wavelength maxima are in the region of 212-296 and 401-410 nm, respectively; Stokes shifts are up to 116 nm, and fluorescence quantum yields are up to 15.0%. It was found that titrating the conjugates with Al3+, Zn2+, and Cd2+ ions results in an increase in the intensity of the emission maxima of the complexes, while the opposite effect was observed in the case of titration with Cu2+ ions. These findings suggest that the studied compounds may be considered as promising chemosensing materials. Finally, a positive solvatochromism of 8-[2,2'-bipyridyl]coumarins and their metal complexes was established. The experimental data are supported by mathematical calculations according to the Lippert-Matagaequation and Kosower diagram.

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10.
Инвентарный номер: нет.
   

   
    Synthesis and photophysical studies of novel v-shaped 2,3-bis{5-aryl-2-thienyl}(dibenzo[f,h])quinoxalines / T. N. Moshkina, E. V. Nosova, A. E. Kopotilova [et al.] // Asian journal of organic chemistry. - 2020. - Vol. 9, № 4. - P673-681
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CROSS-COUPLING -- DIBENZO[F,H]QUINOXALINE -- DONOR-ACCEPTOR-DONOR CHROMOPHORES -- FLUORESCENCE -- SENSORS
Аннотация: A series of novel V-shaped luminophores containing electron-withdrawing dibenzo[f,h]quinoxaline core and arylthienyl donor fragments at positions 2 and 3 has been synthesized. The absorption spectra (UV/vis) were recorded in several solvents, whereas emission spectra were recorded in solutions and powders. The solvatochromism as well as halochromism of obtained compounds was also explored. Electronic-structure calculations using quantum-chemistry methods were performed to further analyse experimental results. All characteristics were compared with that of 2,3-bis(arylthienyl)quinoxaline counterparts. The halochromic effect studies showed that upon gradual addition of trifluoroacetic acid (TFA) to the toluene solution of diethylaminophenyl-substituted dibenzo[f,h]quinoxaline chromophore, absorption and emission changed. Observed band shifts were more distinct in the case of mentioned quinoxaline than for other derivatives. All of the (dibenzo[f,h])quinoxaline chromophores exhibited good sensitivity toward nitro-containing explosives with high Stern-Volmer constants up to 57800 M−1, these results are remarkable for such heterocyclic systems.

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