Photophysical, thermal properties, solvatochromism and DFT/TDDFT studies on novel conjugated D-A-π-A-D form of small molecules comprising thiophene substituted 1,3,4-oxadiazole

Design and Synthesis of D‐π‐A form of p‐Nitrophenylacrylonitrile Substituted Triphenylamine Chromophores; Photophysical, Electrochemical Properties, DFT and Thermal Studies

“…A continuous excitation in solution for molecules TPA‐4(a–e) creates an excited state which interacts with solvents of varying polarity before returning to the ground state. This kind of solute‐solvent interaction of compounds in excited state changes the spectral position and shape of the emission bands as well as life time of the excited state molecule [52] . The bathochromic shift in absorption maxima is observed in polar solvents for these probes was due to the interaction of TPA‐4(a–e) with solvent and is caused by the difference in charge distribution of ground and excited state which consequently reduces the band gap in electronic ground (S 0 ) and excited state (S 1 ) of the probes [53–54] .…”

Recent advances on push–pull organic dyes as visible light photoinitiators of polymerization

“…The less linear solvatochromic behavior of PP1 was assigned to the strong electron-donating ability of the 4-dimethylaminobenzene moiety, but also to the possibility for this group, to initiate hydrogen bonds with the solvent molecules, impacting its solvatochromism. In the two cases, the negative slopes are indicative a major charge redistribution upon photoexcitation, resulting in a significant change of the dipole moment [160][161][162]. While examining the CP of (3,4-epoxycyclohexane)methyl 3,4-epoxycyclohexylcarboxylate (EPOX) for the two component PPx/Iod system (0.3%/2% w/w) (where Iod stands for diphenyliodonium hexafluorophosphate) upon irradiation with a Laser Diode at 473 nm (100 mW/cm 2 ), a fast polymerization process could be detected with PP1 whereas no polymerization could be initiated with PP2.…”

Fe3O4 Nanoparticles Catalyzed Tandem Synthesis of Fluorescent 3‐(4,5‐diaryl‐1H‐imidazol‐2‐yl) quinoline‐2‐amines: Solvatochromic, DFT and Biological Studies

“…The absorption (λ max ) and emission (λ max ) are influenced by the polarity of the solvents [23] . Solvent impacts the band position, intensity with polarities and their hydrogen bond acceptor or donor qualities [24,25] . The energy impact of electronic states is due to interactions between molecules and solvent where the molecular excited states are acutely permeable.…”

“…[23] Solvent impacts the band position, intensity with polarities and their hydrogen bond acceptor or donor qualities. [24,25] The energy impact of electronic states is due to interactions between molecules and solvent where the molecular excited states are acutely permeable. Consequently, it leads to the spectral shifts which can be determined using the influence of the solvents on the absorption and emission spectra.…”