Confinement effect on the photophysics of ESIPT fluorophores

Abstract

The photophysics of three benzothiazole derivatives that exhibit excited state intramolecular proton transfer (ESIPT) were investigated in a confined medium afforded by the water soluble supramolecular host octaacid (OA).

Photophysical, photostability, and ROS generation properties of new trifluoromethylated quinoline-phenol Schiff bases

“…Thus, we can say that these characteristics exist because there is more stabilization of the excited state in a polar environment (DMSO and MeOH), adding to a possible push-pull effect of the diethylamino group (donor group) [14,28,29]. Moreover, these results should indicate a negative possibility of ESIPT occurring (in protic MeOH solvent), being only a direct influence of the substituents on the excited state (Figure 4) [30,31]. 1) compared to the 9,10-diphenylanthracene (DPA) standard molecule.…”

Aggregation tailored emission of a benzothiazole based derivative: photostable turn on bioimaging

“…The AIE + ESIPT hybrid molecular probe 3 was synthesised via a Schiff-base condensation reaction of 4-(diphenylamino)benzaldehyde (possessing three phenyl rotors and a nonplanar structure which make it an ideal building block for AIEgens) and 2-(4-amino-2-hydroxyphenyl)benzothiazole (a characteristic ESIPT active luminogen) (see Scheme 1). 15,16 4-(Diphenylamino) benz-aldehyde (0.412 mmole, 0.112 g) and 2-(4-amino-2hydroxyphenyl)-benzothiazole (0.412 mmole, 0.1 g) were added to a ask, and then 10 mL ethanol and 1 to 2 drops of glacial acetic acid were added. The reaction mixture was then reuxed at 80 C for 18 h. Aer cooling to room temperature and ltering, a yellow powder was obtained that was recrystallized from ethanol and provided the pure compound.…”

Modulation of Twisted Intramolecular Charge Transfer Emission of 2‐(4′‐N,N‐Dimethylaminophenyl)imidazopyridines in Aqueous Cucurbit[7]uril+

“…Further, these host‐guest bindings are used to modulate the photophysical and photochemical properties of the various organic dyes . To date, variety of host systems such as cyclodextrins (CDs), calixarenes, octa‐acids, cucurbit[n]urils (CBns) are used to encapsulate the guest molecules . CBns are water soluble macrocylic hosts and have different number (n) of glycoluril units connected by a pair of methylene linkers ,.…”