Synthesis and optical properties of new 2-(5-arylpyridine-2-yl)-6-(het)arylquinoline-based “push-pull” fluorophores

Synthesis and Photophysical Properties of α-(N-Biphenyl)-Substituted 2,2′-Bipyridine-Based Push–Pull Fluorophores

“…As a result, we calculated Δμ for 3b , g , i , l ( Table 2 ). These values are relatively high for the 2,2′-bipyridine type fluorophores, second only to some examples ( Figure S36 ) [ 22 , 25 , 26 , 30 ]. …”

“…In our recent works, we have already demonstrated a well-pronounced fluorosolvatochromic behavior of 2,2′-bipyridines functionalized with donor substituents, including aniline residues [ 22 , 23 , 25 , 26 ]. The herein-reported compounds 3a–l also exhibited a pronounced fluorosolvatochromism, which was demonstrated for the most representative compounds 3b , g , i , l ( Figure 4 , Figure 5 and Figures S32–S35 ).…”

“…Unless otherwise indicated, all common reagents and solvents were used from commercial suppliers without further purification. 6-Phenyl-3-(pyridin-2-yl)-1,2,4-triazine-5-carbonitrile 2a and 6-(4-tolyl)-3-(pyridin-2-yl)-1,2,4-triazine-5-carbonitrile 2b were synthesized according to reported literature [ 26 , 41 ].…”

Effect of protonation on the photophysical properties of 4-substituted and 4,7-disubstituted quinazoline push-pull chromophores

“…These compounds exhibit intense positive emission solvatochromism, which is characteristic of compounds that undergo an intramolecular charge transfer (ICT) upon excitation. [6][7][8][9] These materials are also sensitive to the presence of acids, [10][11][12][13][14][15] metal cations, [16,17] and various biomolecules [18][19][20] due to the possibility of protonation, complexation, and the formation of hydrogen bonds with the nitrogen atom of the azaheterocycle, respectively. Push-pull nitrogen heterocyclic systems have also been designed for fluorescence sensing of nitroaromatic explosives.…”

Characterization of Push–Pull-Type Benzo[X]quinoline Derivatives (X = g or f): Environmentally Responsive Fluorescent Dyes with Multiple Functions

“…Additionally, quinoline analogs, such as quinine sulfate, have been frequently used as bicyclic fluorophores. − Previous studies have also introduced bis-trifluoromethyl and amino groups on the quinoline ring, whereby fluorescent aminoquinoline derivatives (TFMAQ) have been developed as fluorescent dyes (Scheme ) that respond to various external stimuli such as solvent polarity, heat, , light, and mechanical stimuli. , Moreover, amine-responsive films with absorption color change were developed as an amine sensor . In addition to materials chemistry, there have been recent attempts to develop such materials for use in biochemistry.…”