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Your search keyword '"Maloshitskaya, Olga A."' showing total 43 results
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43 results on '"Maloshitskaya, Olga A."'

1. Heterometallic NIR-emitting nanothermometers by click-reaction between two lanthanide complexes.

Author

Koshelev, Daniil. S., Medved'ko, Aleksei V., Goloveshkin, Alexander S., Nelubina, Yulia V., Maloshitskaya, Olga A., Safiullina, Elnara S., Gracheva, Yulia A., Nikitin, Evgeny A., Lepnev, Leonid S., Vatsadze, Sergey Z., and Utochnikova, Valentina V.

Abstract

Heterobimetallic lanthanide conjugates were obtained by click-reaction between two monometallic lanthanide complexes with Schiff bases for the first time. For that, novel azido- and ethynyl-substituted ligands, as well as their lanthanide complexes, were obtained and characterised; two new crystal structures were obtained. Click-reaction between ligands and complexes was performed, and the latter was demonstrated to result in the conjugates {Ln1–Ln2} formation. Among the obtained conjugates, {Yb–Nd} and {Yb–Er} demonstrated intense NIR emission with temperature sensitivity in the physiological range of up to 3%/K. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Tailoring Wetting Properties of Organic Hole‐Transport Interlayers for Slot‐Die‐Coated Perovskite Solar Modules.

Author

Le, Thai Son, Chuyko, Irina A., Luchnikov, Lev O., Ilicheva, Ekaterina A., Sukhorukova, Polina K., Balakirev, Dmitry O., Saratovsky, Nikita S., Alekseev, Aleksandr O., Kozlov, Sergey S., Muratov, Dmitry S., Voronov, Victor A., Gostishchev, Pavel A., Kiselev, Dmitry A., Ilina, Tatiana S., Vasilev, Anton A., Polyakov, Alexander Y., Svidchenko, Evgenia A., Maloshitskaya, Olga A., Luponosov, Yuriy N., and Saranin, Danila S.

Subjects
ENERGY levels (Quantum mechanics), POLYMER blends, VISCOSITY solutions, SOLAR cells, METALLIC oxides
Abstract

The strategy of incorporating self‐assembled monolayers (SAMs) with anchoring groups is an effective and promising method for interface engineering in perovskite solar cells with metal oxide charge‐transporting layers. However, coating SAM layers in upscaled perovskite solar modules (PSMs) using slot‐die coating is challenging due to the low viscosity and wettability of the solutions. In this study, a triphenylamine‐based polymer poly([{5‐[4‐(diphenylamino)phenyl]‐2‐thienyl}(4‐fluorophenyl)methylene]malononitrile) (pTPA)–TDP, blended with SAM based on 5‐[4‐[4‐(diphenylamino)phenyl]thiophene‐2‐carboxylic acid, is integrated to address these challenges. And, p–i–n‐oriented PSMs on 50 × 50 mm2 substrates (12 sub‐cells) are fabricated with a NiO hole‐transport layer and organic interlayers for surface modification. Wetting angle mapping shows that ununiform regions of the slot‐die‐coated SAM has extreme hydrophobicity, causing absorber thickness fluctuations and macro‐defects at buried interfaces. The blended interlayer at the NiO/perovskite junction homogenizes surface wettability and mitigates lattice strain, enabling the effective use of SAM properties on large surfaces. This improved energy level alignment, enhancing the power conversion efficiency of the modules from 13.98% to 15.83% and stability (ISOS‐L‐2, T80 period) from 500 to 1630 h. In these results, the complex effects of using SAM in slot‐die‐coating technology for large‐scale perovskite photovoltaics are highlighted. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Synthesis and Photophysical Properties of Novel Meta-Conjugated Organic Molecules with 1,3,5-Benzene Branching Units

Author

Skorotetcky, Maxim S., primary, Surin, Nikolay M., additional, Svidchenko, Evgeniya A., additional, Pisarev, Sergey A., additional, Fedorov, Yury V., additional, Borshchev, Oleg V., additional, Kuleshov, Bogdan S., additional, Shaposhnik, Polina A., additional, Maloshitskaya, Olga A., additional, and Ponomarenko, Sergey A., additional

Published
2022
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14. Synthesis and structural characterization of cis- and trans-fused 4a,5,6,7,8,8a-hexahydro-2H,4H-1,3-benzodithiines and their 2-methyl and 2,2-dimethyl derivatives

Author

Pihlaja, Kelevi, Klika, Karel D., Sinkkonen, Jari, Ovcharenko, Vladimir V., Maloshitskaya, Olga, Sillanpaa, Reijo, and Czombos, Jozsef

Subjects
Organic compounds -- Synthesis, Heterocyclic compounds -- Research, Glycols -- Usage, Chemical structure -- Analysis, Biological sciences, Chemistry
Abstract

The synthesis and conformational properties of cis- and trans-fused 4a,5,6,7,8,8a-hexahydro-2H,4H-1,3-benzodithiines and their 2-methyl and 2,2-dimethyl derivatives are described. The compounds are prepared as racemates from dithiols and characterized by proton and carbon nuclear magnetic resonance spectoscopies.

Published
2002

32. Synthesis of Dansyl-Substituted Cryptands Containing Triazacycloalkane Moieties and their Evaluation as Fluorescent Chemosensors.

Author

Chernichenko, Nataliya M., Shevchuk, Vadim N., Averin, Alexei D., Maloshitskaya, Olga A., and Beletskaya, Irina P.

Subjects
ALKANES, SUBSTITUTION reactions, CHEMORECEPTORS
Abstract

A method for the synthesis of a new family of cryptands containing 1,4,7-triazacyclononane and 1,5,9-triazacyclododecane moieties and dansyl fluorophore groups has been elaborated starting from free triazacycloalkanes and employing Pd(0)-catalyzed amination at the macrocyclization step. The dependence of the products yields on the nature of reagents has been established. The majority of synthesized macrobicycles have been evaluated as possible chemosensors for detecting metal cations. Compound comprising 1,4,7-triazacyclononane and dioxadiamine linker proved to be a prospective colorimetric sensor for Cu(II) by changing its absorption spectrum in the presence of this cation, while other cryptands demonstrated full quenching of fluorescence in the presence of Cu(II) and Al(III) what makes them promising fluorescent molecular probes for these metals. [ABSTRACT FROM AUTHOR]

Published
2017
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43. Cyclization of 2-acyl- and 2-thioacylaminobenzylcyclopropanes in the gas phase and solution.

Author

Lebedev AT, Giorgi G, Maloshitskaya OA, Kuchumova J, Samgina T, Dem'yanov P, Karakhanova N, Mochalov S, and Fedotov A

Abstract

Mass spectrometry proved itself to be a powerful tool to predict the directions and yields of mono- molecular reactions of organic compounds. Electron ionization (EI) and electrospray ionization (ESI) were used to study possible transformations of N-(ortho-cyclopropylmethylphenyl)arylamides I and N-(ortho- cyclopropylmethylphenyl)arylthioamides II as well as their para-isomers III and IV in a mass spectrometer and to predict directions and yields of their acid catalyzed cyclization reactions. Several five-eight-membered heterocycles were proposed as possible products of intramolecular transformations of compounds I and II. Reactions of compounds I and II in sulfuric acid solutions were carried out and the results obtained were compared with mass spectrometric data. Surprisingly, EI of the studied compounds mimics their solution reactions better than ESI.

Published
2009
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