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• W3126374260 abstract "• Four novel fluorescent d -π-A type N-pyridin-(2-ylpyridin)−2-amine based styryl dyes were synthesized. • These dyes showed a bathochromic shift in emission from non-polar to polar solvents. • These dyes exhibited positive solvatochromism. • These novels N-pyridin-(2-ylpyridin)−2-amine based styryl dyes exhibited viscosity sensitive characteristic in PEG 400: ethanol system. • The synthesized styryl dyes exhibited good thermal stability. Four novel push-pull d -π-A type chromophores namely (E)-2-cyano-3-(4-(di(pyridin-2-yl)amino)phenyl)acrylic acid (BECA) , (E)-2-(5-(4-(di(pyridin-2-yl)amino)benzylidene)-4-oxo-2-thioxothiazolidin-3-yl)acetic acid (BERA) , (E)-2-cyano-3-(5-(di(pyridin-2-yl)amino)thiophen-2-yl)acrylic acid (THCA) and (E)-2-(5-((5-(di(pyridin-2-yl)amino)thiophen-2-yl)methylene)-4-oxo-2-thioxothiazolidin-3-yl)acetic acid (THRA) were synthesized. The dyes synthesize were characterized by HR-MS, 1 H NMR, and 13 C NMR spectroscopies. The synthesized dyes show absorption and emission wavelength in the range of 362–499 nm and 471–557 nm respectively. The chromophores BECA and BERA show a large stroke shift (63–130 nm) as compared to chromophores THCA and THRA (38–62 nm). Oscillator strengths (f), transition dipole moments (μ eg ), and different solvent polarity plots have been investigated for understanding intramolecular charge transfer (ICT) characteristics from donor to the acceptor. Interestingly, the viscosity induced emission for all four chromophores were observed in ethanol: polyethylene - 400 solvent mixtures. The computational study of these chromophores was carried out by using density functional theory (DFT) along with time-dependent density functional theory (TD-DFT)." @default.
• W3126374260 created "2021-02-15" @default.
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• W3126374260 date "2021-06-01" @default.
• W3126374260 modified "2023-10-16" @default.
• W3126374260 title "Synthesis of Novel d-π-A chromophores: Effect of structural manipulations on photophysical properties, viscosity and DFT study" @default.
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• W3126374260 doi "https://doi.org/10.1016/j.molstruc.2021.130086" @default.
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