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

   
    2,2 '-Bipyridinyl carboranes as B,N,N-ligands in cyclometallated complexes of platinum(II) [] / A. M. Prokhorov, P. A. Slepukhin, V. L. Rusinov, V. N. Kalinin, D. N. Kozhevnikov // Chemical Communications. - 2011. - Vol. 47, № 27. - С. 7713-7715
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
O-CARBORANE -- METALLACARBORANES -- PHOTOLUMINESCENT
Аннотация: Novel B,N,N-cyclometallated Pt(II) complexes of 2,2'-bipyridin-6-yl carboranes exhibit absorption and emission similar to relative Pt(II) complexes of aromatic C,N,N-ligands: the same transitions but lower intensities. DFT calculations suggest the former emits from the (3)MLCT state while for the latter the mixed (3)ICT-MLCT transitions should be considered

\\\\expert2\\NBO\\Chemical Communications\\2011,v.47. p.7713.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.
   

   
    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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4.
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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5.
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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6.
Инвентарный номер: нет.
   
   F 97

   
    Fundamental absorption edge of NiO nanocrystals [Electronic resource] / V. I. Sokolov, A. V. Druzhinin, D. G. Kim, N. B. Gruzdev, A. Ye. Yermakov, M. A. Uimin, I. V. Byzov, N. N. Shchegoleva, V. B. Vykhodets, T. E. Kurennykh // Physica B: Condensed Matter . - 2013. - Vol. 430. - С. 1-5. - Bibliogr. : p. 5 (29 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
TRANSITION METAL OXIDE -- OPTICAL PROPERTIES -- CHARGE TRANSFER TRANSITIONS
Аннотация: NiO nanocrystals with the average size of 5, 10 and 25 nm were synthesized by gas-condensation method. The well-defined increase of the optical density D near the fundamental absorption edge of NiO nanocrystals in the range of 3.5–4.0 eV observed after the annealing in air is caused by the oxygen content growth. It is the direct experimental evidence of the fact that p—d charge transfer transitions form the fundamental absorption edge

\\\\expert2\\NBO\\Physica B\\2013, v.430, p. 1-5.pdf
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7.
Инвентарный номер: нет.
   
   N 10

   
    N-(2-(2-pyridyl)ethyl)chitosan: Synthesis, characterization and sorption properties / S. YU. Bratskaya, Yu. A. Azarova, E. G. Matochkina, M. I. Kodess, Yu. G. Yatluk, A. V. Pestov // Carbohydrate Polymers. - 2012. - Vol. 87, № 1. - С. 869-875
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHITOSAN N-HETEROCYCLIC DERIVATIVES -- SELECTIVE ADSORPTION -- PYRIDINE DERIVATIVES
Аннотация: The method of producing N-2-(2-pyridyl)ethylchitosan (PE-chitosan) with substitution degrees (DS) up to 1.2 has been developed using the "synthesis in gel" approach for direct addition reaction between 2-vynilpyridine and chitosan. Investigation of sorption properties has revealed significantly higher affinity of pyridylethyl fragments to Pt(IV)) and Pd(II) ions compared to the unsubstituted amino groups of chitosan. The maximum sorption capacities of PE-chitosan in 0.1 M HCl solution were estimated as 5.56 mmol/g for Au(III), 3.67 mmol/g for Pd(II), and 2.75 mmol/g for Pt(IV). Sorption capacities of PE-chitosan for transition metal ions at pH 4-8 were 1.5-2.6 higher than those of chitosan with the highest values attained for Cu(II) and Ag(I) ions - 1.50 mmol/g and 1.53 mmol/g, respectively. The PE-chitosan application for preconcentration of Au(III) with subsequent elution with HCl/thiourea mixtures was proved to be efficient for atomic absorption spectroscopy analysis of multi-component solutions with low gold content

\\\\Expert2\\nbo\\Carbohydrate Polymers\\2012, v. 87, p.869.pdf
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8.
Инвентарный номер: нет.
   
   N 10

   
    N-(2-(2-pyridyl)ethyl)chitosan: synthesis, characterization and sorption properties [Text] / S. YU. Bratskaya, Yu. A. Azarova, E. G. Matochkina, M. I. Kodess, Yu. G. Yatluk, A. V. Pestov // Carbohydrate Polymers. - 2011. - In Press, Accepted Manuscript, Availabe online 31 Augist 2011
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The method of producing N-2-(2-pyridyl)ethylchitosan (PE-chitosan) with substitution degrees (DS) up to 1.2 has been developed using the “synthesis in gel” approach for direct addition reaction between 2-vynilpyridine and chitosan. Investigation of sorption properties has revealed significantly higher affinity of pyridylethyl fragments to Pt(IV)) and Pd(II) ions compared to the unsubstituted amino groups of chitosan. The maximum sorption capacities of PE-chitosan in 0.1 M HCl solution were estimated as 5.56 mmol/g for Au(III), 3.67 mmol/g for Pd(II), and 2.75 mmol/g for Pt(IV). Sorption capacities of PE-chitosan for transition metal ions at pH 4-8 were 1.5-2.6 higher than those of chitosan with the highest values attained for Cu(II) and Ag(I) ions–1.50 mmol/g and 1.53 mmol/g, respectively. The PE-chitosan application for preconcentration of Au(III) with subsequent elution with HCl/thiourea mixtures was proved to be efficient for atomic absorption spectroscopy analysis of multi-component solutions with low gold content

\\\\Expert2\\nbo\\Carbohydrate Polymers\\2011, Article inPress, 31 August.pdf
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9.
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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10.
Инвентарный номер: нет.
   
   O-84

    Osintseva, E. V.
    Protolytic properties and complexation with copper(II) ions of some azo derivatives of beta-arylaminopropionic acids [Electronic resource] / E. V. Osintseva, L. K. Neudachina, Yu. G. Yatluk // Russian Journal of Inorganic Chemistry (Zhurnal Neorganicheskoi Khimii). - 2010. - Vol. 55, № 10. - P1644-1650
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The azo coupling reaction of N-(2-carboxyethyl)anthranilic acid and N,N,N,N-tetrabis(2-carboxyethyl)-1,3-phenylenediamine with diazosulfanilic acid yielded the complexones sodium 4-N-(2-carboxyethyl)amino-5-carboxyazobenzene-4?-sulfonate (I) and 2,4-N,N,N,N-tetrabis(2-carboxyethyl)diaminoazobenzene-4?-sulfonic acid (II), respectively. The acidity constants of I and II (20°C = 0.1M KCl) were determined to be as follows: for I, pK 00 = 1.29 ± 0.13, pK 0 = 2.92 ± 0.07, pK 1 = 3.92 ± 0.05, pK 2 = 5.16 ± 0.03; for II, pK 00 = 2.35 ± 0.06, pK 0 = 2.81 ± 0.09, pK 1 = 3.21 ± 0.11, pK 2 = 3.81 ± 0.09, pK 3 = 4.34 ± 0.04, pK 4 = 5.03 ± 0.06, pK 5 = 6.67 ± 0.07. The electronic absorption spectra of I and II were measured, and acid-base equilibrium scheme for I and II in aqueous solutions were suggested. The complexation constants of I and II with copper(II) ions were determined to be logK CuQI= 5.47 ± 0.06 and logK CuQII= 5.72 ± 0.13 (20°C = 0.1 M KCl). ??

\\\\Expert2\\nbo\\Russian Journal of Inorganic Chemistry\\2010, v. 55, N 10, с.1644.pdf
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