Enhancement of intramolecular charge transfer strength in diphenylamine substituted symmetric 1,3,4-oxadiazole derivatives

Abstract

Introduction of a central benzene ring could increase the charge transferred distance, and further contribute to the enhancement of the intramolecular charge transfer strength.

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

“…The decrease of the uorescence quantum yields as the solvent polarity increases is attributed to the induced solutesolvent interactions in polar solvents. 42 On the other hand, the uorescence lifetime has shown the highest value in DMSO of 2.24 ns and 3.19 ns and lowest values in CHX of 1.23 ns and 1.86 ns for MOT and DMAT, respectively indicating the stabilization of the excited ICT state in polar solvents. The radiative (k r ¼ F f / s) and non-radiative (k nr ¼ (1 À F f )/s) rate constants can be evaluated from the measured uorescence quantum yields and uorescence lifetimes.…”

“…Over the last decade, solvent dependent photophysical properties for a variety of chemical structures still found interest in literature. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] The present work reports the spectral behaviour of a couple of thiophene-based compounds of D-p-A type, with the same structure and different electron donating groups, namely 2-uoro-4-(5-(4-methoxyphenyl)thiophen-2-yl)benzonitrile (MOT) and 4-(5-(4-(dimethylamino)phenyl)thiophen-2-yl)-2-uorobenzonitrile (DMAT). Solvent effect on their photophysical properties are to be studied and accordingly the dipole moment difference between the ground and excited states (Dm) can be evaluated.…”

Aggregation-induced emission enhancement (AIEE)-active tetraphenylethene (TPE)-based chemosensor for Hg2+ with solvatochromism and cell imaging characteristics

“…[28][29][30][31][32][33] Meanwhile, many stimuli-responsive materials have been reported, including photochromism, mechanochromism, and solvatochromism. [34][35][36][37][38][39][40][41][42][43][44][45][46] At present, the solvatochromism materials have been generally used in chemical and biological systems. 47 To date, many uorescent chemosensors for Hg 2+ have been reported.…”

Accurate Analysis of Anisotropic Carrier Mobility and Structure–property Relationships in Organic BOXD Crystalline Materials

“…Among them, charge mobility is one of the most crucial factors of organic semiconductor crystals, as seen from the fact that the mobilities of organic semiconductor crystals have been greatly improved since it was first used in transistors. A great deal of experimental and theoretical research studies has focused on the improvement of the charge mobility ( Zhang et al, 2013 ; He et al, 2018 ; Ozdemir et al, 2018 ; Chen et al, 2019b ; and Liu Y. et al, 2020 ). By changing the length and position of the side chain of several kinds of semiconducting materials, Wang and Grozema et al have modified the molecular packing pattern and thus changed the charge mobility ( Grozema et al, 2002 ; Lei et al, 2013 ; and Wang et al, 2013 ).…”