- Synthesis and characterization of linear 1,4-diazine-triphenylamine–based selective chemosensors for recognition of nitroaromatic compounds and aliphatic amines
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Novel 1,4-diazine-based dyes of the D–π–A type, possessing triphenylamine as an electron-donating group, have been developed. Fluorescence studies have demonstrated that emission of these fluorophores is sensitive towards different nitroaromatic compounds and aliphatic amines, both in solutions and in a vapor phase. Moreover, these compounds can be considered as “naked-eye” fluorescent probes for solution polarity because they possess pronounced solvatochromic properties. Therefore, these compounds have to be regarded as potential multifunctional chemosensors for monitoring hazardous organic substances.
- Baranova, Anna A.,Charushin, Valery N.,Chupakhin, Oleg N.,Chuvashov, Roman D.,Khokhlov, Konstantin O.,Kvashnin, Yuriy A.,Makarova, Nadezhda I.,Metelitsa, Anatoly V.,Rusinov, Gennady L.,Schapov, Il'ya E.,Shchepochkin, Aleksandr V.,Verbitskiy, Egor V.,Vetrova, Elena V.,Yakovleva, Yuliya A.,Zhilina, Ekaterina F.
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- Influence of (de)protonation on the photophysical properties of phenol-substituted diazine chromophores: experimental and theoretical studies
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In this contribution, a series of seven new push-pull systems has been designed by combining a protonable diazine heterocycle (pyrimidine/pyrazine) with a deprotonable phenol unit through various π-conjugated linkers (phenylene, thienylene, thienylenevinylene, and phenylenevinylene). The (de)protonation in solution resulted in a systematic bathochromic shift both in the absorption and emission maxima compared to the neutral forms. Extensive Density Functional Theory (DFT) and its Time Dependent counterpart (TD-DFT) calculations were performed to rationalize this behavior and understand the impact of (de)protonation on the different optical transitions. These computations showed that (de)protonation affects both the energy and the nature of the vertical transitions, with a significant increase in the Intramolecular Charge Transfer (ICT) character of the (de)excitations. Some of the compounds remained moderately luminescent after (de)protonation, giving a mixture of complementary emitting species that were used to obtain white light emission.
- Achelle, Sylvain,Fihey, Arnaud,Hodée, Maxime,Katan, Claudine,Lenne, Augustin,Robin-Le Guen, Fran?oise,Rodríguez-López, Julián
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p. 19132 - 19144
(2021/10/29)
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- Synthesis of new heterocycles festooned with thiophene and evaluating their antioxidant activity
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The chemical performance of 5-bromo-2-(bromoacetyl)-thiophene (1) was tested toward the reaction with numerous bi-nucleophilic reagents (namely; 2-aminobenzothiazoles, 2-aminothiazole, 2-aminotetrazole, 2-aminotriazole, 2-aminopyridines, 2-aminobenzimidaz
- Abed, Nader A.,Hammouda, Mohamed M.,Ismail, Mohamed A.,Abdel-Latif, Ehab
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p. 4153 - 4163
(2020/09/09)
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