Study on intramolecular charge transfer fluorescence properties of trans-4-[4′-(N,N′-dimethylamino)styryl]pyridine: Effect of solvent and pH

ESIPT reaction of potential bioactive heterocyclic Schiff base: Atomic visualization coupled with in vitro spectroscopy

“…Photoinduced electron transfer and proton transfer are important fundamental processes for many biochemical reactions and find numerous applications in scientific field [1][2][3][4][5][6][7][8][9][10][11][12][13]. Amongst all the photoinduced processes, excited state proton transfer are of special interest.…”

Effect of solvents on photophysical properties and quenching of 2‐{[3‐(1H‐benzimidazole‐2‐yl) phenyl] carbonoimidoyl}phenol

“…Solvent effect depends on the nature and extent of solute‐–solvent interactions developed in the solvation shell of the solute. Depending on the interaction of the solute with solvent in the ground state and first excited state of the solute, solvent will cause changes in electronic transitions . Solvatochromic effect can be used to determine the electro‐optical parameters such as dipole moments of ground and excited states of the solute .…”

Selective imaging and cancer cell death via pH switchable near-infrared fluorescence and photothermal effects

“…The fully quenched signal under neutral pH can be ascribed to the formation of a non-fluorescent ICT state 43 in which the stabilized charge transfer excited state becomes closer to the triplet excited state as well as the ground states. 44 This therefore increases the rates of intersystem crossing and internal/external conversion via non-radiative decay, resulting in local hyperthermia. 45 In contrast, the protonation of the bridgehead amine under acidic environments delocalizes the conjugated system and disrupts the charge transfer.…”

“… 33 The conformations of IR1–4 in their deprotonated and protonated states were optimized by means of density functional theory (DFT) methods with the B3LYP/6-311G basis set levels prior to the population analysis of the frontier molecular orbitals (FMOs) of these compounds. In the deprotonated form, the HOMO localized both on the Hcyanine scaffold and bridgehead amine, whereas the LUMO only spread over the polymethine chain, indicating a significant charge transfer from the terminal amine to the polymethine upon excitation 44 ( Fig. 4A and S4 † ).…”