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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mohammed M. S. I., Kovalev I. S., Slovesnova N. V., Sadieva L. K., Platonov V. A., Novikov A. S., Santra S., Morozova J. E., Zyryanov G. V., Charushin V. N., Ranu B. C.
Заглавие : Polyaromatic hydrocarbon (PAH)-based aza-POPOPS: synthesis, photophysical studies, and nitroanalyte sensing abilities
Место публикации : International journal of molecular sciences. - 2023. - Vol. 24, № 12. - С. 10084
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): aza-popops--click reactions--chemosensors
Аннотация: 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) is a common scintillation fluorescent laser dye. In this manuscript, the synthesis of 2-Ar-5-(4-(4-Ar'-1H-1,2,3-triazol-1-yl)phenyl)-1,3,4-oxadiazoles (Ar, Ar' = Ph, naphtalenyl-2, pyrenyl-1, triphenilenyl-2), as PAH-based aza-analogues of POPOP, by means of Cu-catalyzed click reaction between 2-(4-azidophenyl)-5-Ar-1,3,4-oxadiazole and terminal ethynyl-substituted PAHs is reported. An investigation of the photophysical properties of the obtained products was carried out, and their sensory response to nitroanalytes was evaluated. In the case of pyrenyl-1-substituted aza-POPOP, dramatic fluorescence quenching by nitroanalytes was observed.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sharapov A. D., Fatykhov R. F., Khalymbadzha I. A., Kopchuk D. S., Nikonov I. L., Potapova A. P., Shtaitz Y. K., Slepukhin P. A.
Заглавие : Conjugates of 8-[2,2’-bipyridinyl]coumarins as potential chemosensors for Al3+, Cu2+, Cd2+, Zn2+ ions: synthesis and photophysical properties
Место публикации : Chimica Techno Acta. - 2023. - Vol. 10, № 4. - С. 202310417
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lavrinchenko I. A., Moseev T. D., Varaksin M. V., Zyryanov G. V., Taniya O. S., Tsmokalyuk A. N., Charushin V. N., Chupakhin O. N., Demidov O. P., Borovlev I. V.
Заглавие : 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
Место публикации : New Journal of Chemistry. - 2022. - Vol. 46, № 11. - С. 5121-5128
Предметные 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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4.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mohammed M. S. I., Sadieva L. K., Kovalev I. S., Taniya O. S., Kopchuk D. S., Zyryanov G. V., Charushin V. N., Ranu B. C.
Заглавие : Using the click methodology for the synthesis of peg-substituted polyaromatic chemosensors for the detection of nitroaromatic compounds
Место публикации : Успехи синтеза и комплексообразования = Advances in synthesis and complexing : сборник тезисов шестой Международной научной конференции. - Москва, 2022. - С. 210
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovalev I. S., Sadieva L. K., Taniya O. S., Kopchuk D. S., Zyryanov G. V., Ulomsky E. N., Rusinov V. L., Chupakhin O. N.
Заглавие : Detection of anti-viral drug riamilovir and herbicides in aqueous media by using pyrene-based fluorescent chemosensors
Место публикации : Chimica Techno Acta. - 2021. - Vol. 8, № 2. - С. 20218208
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): covid-19--riamilovir--triazavirin--detection in aqueous media--fluorescence quenching
Аннотация: Two ethyleneglycol esters of 1-pyrene carboxylic acid were studied as chemosensors for the fluorescence “turn-off” detection of two nitro-containing analytes, such as antiviral drug Riamilovir (Triazavirin ®) and herbicidal agent dinitro-ortho-cresol (DNOC). In both cases the dramatic fluorescence quenching was observed with quenching constants as high as 3·104 M-1 and limits of detection (LOD) as low as 100 ppb.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovalev I. S., Sadieva L. K., Taniya O. S., Yurk V. M., Minin A. S., Kopchuk D. S., Zyryanov G. V., Ulomsky E. N., Rusinov V. L., Charushin V. N., Chupakhin O. N.
Заглавие : Pyrene-based lipophilic/biphilic chemosensors for the fluorescence "turn-off" detection of nitroanalytes in aqueous media
Место публикации : AIP Conference Proceedings. - 2021. - Vol. 2388, № 1. - Ст.030015
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Two approaches towards “turn off” fluorescence detection of nitroanalytes (dinitro-ortho-cresol (DNOC), 2,4,6-trinitrotoluene (TNT) and Riamilovir (Triazavirin ®) are reported such as by tuning the chemosensors structure or by changing the environment. In both cases the great response was achieved with Stern-Volmer quenching constants (KSV) as high as 2.28–3.14 × 104 M−1 (for structure modification approach) and 4.67 × 105 M−1 (for changing of environment approach).
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platonov V. A., Zyryanov G. V., Kovalev I. S., Kopchuk D. S., Taniya O. S., Bhattacherjee D., Chupakhin O. N.
Заглавие : Urea-containing oligomers/polymers as chemosensors for visual detection of phosphate anions
Место публикации : AIP Conference Proceedings. - 2021. - Vol. 2388, № 1. - Ст.040004
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Isomeric urea-containing polymeric/oligomeric chemosensors for anions were prepared by means of interaction of isomeric diaminobihenyls with triphosgene. An intensive “turn-on” fluorescence response toward phosphate anion in solutions was observed.
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovalev I. S., Sadieva L. K., Taniya O. S., Yurk V. M., Minin A. S., Kopchuk D. S., Zyryanov G. V., Charushin V. N., Chupakhin O. N.
Заглавие : Bispyrenylalkane chemosensor for the naked-eye detection of nitro-explosives
Место публикации : Chimica Techno Acta. - 2021. - Vol. 8, № 2. - С. 20218209
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): detection of explosives in aqueous media--chemical sensors--fluorescence quenching--pyrene-based fluorophores
Аннотация: Pyrene-based compounds have a great potential as fluorescent chemosensors for various analytes including common nitroexplosives, such as 2,4,6-trinitrotoluene (TNT). Compounds having two pyrene units in one molecule, such as bispyrenylalkanes, are able to form stable, bright emissive in a visual wavelength region excimers both in non-polar and polar environments. In this work we wish to report that in non-polar solvents the excimer has poor chemosensing properties while in aqueous solutions it provides significant “turn-off” fluorescence response to TNT in the subnanomolar concentrations.
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovalev I. S., Sadieva L. K., Taniya O. S., Yurk V. M., Minin A. S., Santra S., Zyryanov G. V., Charushin V. N., Chupakhin O. N., Tsurkan M. V.
Заглавие : Computer vision vs. spectrofluorometer-assisted detection of common nitro-explosive components with bola-type PAH-based chemosensors
Место публикации : RSC Advances. - 2021. - Vol. 11, № 42. - С. 25850-25857
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Computer vision (CV) algorithms are widely utilized in imaging processing for medical and personal electronics applications. In sensorics CV can provide a great potential to quantitate chemosensors' signals. Here we wish to describe a method for the CV-assisted spectrofluorometer-free detection of common nitro-explosive components, e.g. 2,4-dinitrotoluene (DNT) and 2,4,6-trinitrotoluene (TNT), by using polyaromatic hydrocarbon (PAH, PAH = 1-pyrenyl or 9-anthracenyl) – based bola-type chemosensors. The PAH components of these chemical bolas are able to form stable, bright emissive in a visual wavelength region excimers, which allows their use as extended matrices of the RGB colors after imaging and digital processing. In non-polar solvents, the excimers have poor chemosensing properties, while in aqueous solutions, due to the possible micellar formation, these excimers provide “turn-off” fluorescence detection of DNT and TNT in the sub-nanomolar concentrations. A combination of these PAH-based fluorescent chemosensors with the proposed CV-assisted algorithm offers a fast and convenient approach for on-site, real-time, multi-thread analyte detection without the use of fluorometers. Although we focus on the analysis of nitro-explosives, the presented method is a conceptual work describing a general use of CV for quantitative fluorescence detection of various analytes as a simpler alternative to spectrofluorometer-assisted methods.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovalev I. S., Sadieva L. K., Taniya O. S., Volkova N.N., Minin A. S., Grzhegorzhevskii K. V., Gorbunov E. B., Zyryanov G. V., Chupakhin O. N., Charushin V. N., Tsurkan M. V.
Заглавие : Bola-type pah-based fluorophores/chemosensors: synthesis via an unusual clemmensen reduction and photophysical studies
Место публикации : Journal of photochemistry and photobiology A: Chemistry. - 2021. - Vol. 420. - С. 113466
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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