Investigating the structure–fluorescence properties of tetraphenylethylene fused imidazole AIEgens: reversible mechanofluorochromism and polymer matrix controlled fluorescence tuning

Abstract

A series of stimuli-responsive AIEgens of tetraphenylethyelene (TPE) fused Imidazole derivatives (1-7) were synthesized and explored their substituents controlled fluorescent properties in the solid state. The structure of the synthesized...

Distinct fluorescence state, mechanofluorochromism of terpyridine conjugated fluorophores and the reusable sensing of nitroaromatics in aqueous medium

“…It is noted that TPE, a typical AIE unit, mostly produces non-fluorescence derivatives in the solution state due to the free C-C single bond rotation. 15,55,56 On the other hand, the integrating acceptor units play an important role for TPA derivatives to make them dual (solution and solid) state or single state fluorescence materials. 57,58 Pyrene, a rigid polyaromatic unit, often exhibited strong fluorescence only in the solution state.…”

“…[8][9][10][11][12][13] Compared to the chemical structural change mediated fluorescence modification, which is limited to only a few organic derivatives, the fluorescence modulation by physical structural changes has attracted increased interest owing to the molecular diversity and simple operating principle. 14,15 The molecular structure and supramolecular interactions exert significant influence on the physical molecular assembly and fluorescence in the solid a Department of Applied Chemistry, Karunya Institute of Technology and Sciences, state. [16][17][18] For example, constructing fluorophores using a nonplanar core effectively hindered the strong aromatic pÁ Á Áp stacking.…”

Multistimuli Fluorescence-Responsive TPA/TPE-Imidazo[1,2-a]pyridine π-Conjugated Donor–Acceptor Derivatives and Effect of Donor Structures

“…29,30 Imparting twisted molecular unit in the π-conjugated structure can hinder the close π-stacking and overcomes the ACQ effect and resulted in the aggregation-induced emission (AIE) in the solid state. 31 The AIEgens showed strong fluorescence in the solid state and exhibited no/weak fluorescence in the solution state. The emission efficiency and emission color of AIEgens were tuned by tailoring the molecular structure and intermolecular interactions.…”

“…Organic π-conjugated donor–acceptor (D–A) materials that exhibit external stimuli (light, pH, mechanical force, temperature, electricity, and chemical substances)-responsive fluorescence behavior − are potential candidates for wide range of applications such as probes, photovoltaics, information storage, security inks, , optical switches, bioimaging, , optoelectronics, anticounterfeiting, and chemical sensing. , The molecular structure, conformation, and intermolecular interactions significantly influenced the fluorescence properties of organic molecules. − For instance, the strongly fluorescent π-conjugated organic molecule in the solution state often show weak or nonfluorescence in the solid state due to aggregation-caused quenching (ACQ). , Imparting twisted molecular unit in the π-conjugated structure can hinder the close π-stacking and overcomes the ACQ effect and resulted in the aggregation-induced emission (AIE) in the solid state . The AIEgens showed strong fluorescence in the solid state and exhibited no/weak fluorescence in the solution state.…”