Photophysical properties and fluorosolvatochromism of D–π–A thiophene based derivatives

Abstract

Solvation-dependent photophysical properties of two push–pull thiophene-based compounds with donor–π–acceptor (D–π–A) structures were investigated using absorption, fluorescence emission and time resolved spectroscopy, and supported by different solvation models.

Solvent Effect on the Excited Charge Transfer State of Naphthylamine Sulfonate Derivatives: Steady State and Time resolved studies

“…5. In contrast to our previous observation [2,[6][7][8][9][10] that the dependence of  on E T N always presented two groups of solvents one for protic and other for aprotic solvents, the current set of compounds show linear dependence for 1NA4S and 2NA6S on E T N as shown in Fig. 5.…”

“…ICT compounds are characterized by the existence of an electron-donating and electron withdrawing moieties linked by -bridge (D--A). Research interests in ICT systems are also extended for the study of molecular systems having an intermolecular charge transfer excited state but greatly influenced by specific interactions [2][3][4][5][6][7][8][9][10]. For molecular systems with excited state intramolecular charge transfer (ESICT) phenomenon, in most cases the observed dual emission arises from the locally (LE) and intramolecular charge transfer (ICT) states.…”

Green synthesis of ethyl cinnamates under microwave irradiation: photophysical properties, cytotoxicity, and cell bioimaging

“…The decreasing trend in quantum yield in non-polar solvents may be attributed to the slight difference between their ground and excited states. 52–54 Moreover, SS values above 100 nm were found for compound 3b in THF, EtOAc, dioxane, ACN, and DMSO (Table 2 and Fig. 4).…”

New organic dye-sensitized solar cells based on the D–A–π–A structure for efficient DSSCs: DFT/TD-DFT investigations

“…14 In general, most used organic dyes for DSSCs are artificial sensitizers that possess the donor–π-spacer–acceptor (D–π–A) molecular architecture, which is intended to provide intramolecular charge transport (ICT) from the donor unit (D) to the acceptor group (A) via the π-spacer. 15–17 Other potential structures of artificial sensitizers, including D–A–π–A, 18–20 D–D–π–A, 21,22 (D–π–A) 2 , 23,24 D–π–A–A, 25,26 and A–π–D–π–A, 27,28 have also been established and gained significant importance due to their high efficacy, 29 but the most common structure is (D–π–A) because it facilitates electron movement, which improves the efficiency of dyes and allows them to be used in DSSCs. 30–32 Since the efficiency of a DSSC cell is highly dependent on the photosensitive dye used in the cell, the following points can be used when designing the cell to improve and raise the efficiency of DSSCs: (a) it must include the most appropriate π-spacers between the electron donor and the acceptor; (b) it is important to have a broad and strong absorption band capable of covering practically all the visible and near-infrared spectral region (NIR); (c) appropriate redox and oxidation potentials of the compound should be investigated to ensure regeneration; (d) a high electron connection is necessary between the molecules and conduction band of the semiconductor (TiO 2 ) to accelerate the transfer of electrons from the dye to TiO 2 .…”