An Easily Accessible Ionic Aggregation‐Induced Emission Luminogen with Hydrogen‐Bonding‐Switchable Emission and Wash‐Free Imaging Ability

Abstract

Ionic fluorophores are powerful tools for the study of environmental science and bio‐imaging. However, traditional ionic dyes usually require long synthetic steps and suffer from a quenching effect caused by aggregation. A water‐soluble ionic aggregation‐induced emission luminogen called DBTA is presented, which is readily accessed by a one‐step reaction. The switchable emission manipulated by hydrogen bonding provided solid evidence for the restriction of intramolecular motions as the mechanism of aggregation‐induced emission. DBTA can not only differentiate solvents with different H‐bond donor acidities but also capable of wash‐free imaging in living HeLa cells and fish larva.

Structural Insight of Anthracene Orientation by Halogen Substitution: Impact on Solid-State Fluorescence and Stimuli-Induced Fluorescence Switching

“…For instance, nonplanar conformationally flexible π-conjugated organic donor–acceptor molecules exhibited aggregation/crystallization-induced strongly enhanced emission in the solid state. − The conformational freedom of the fluorophores often produced fluorescent polymorphs with tunable emission. − The flexible molecular conformation, loose molecular packing, and weak intermolecular interaction can easily be disturbed by external force (mechanical pressure, light, heat, and solvent vapor) and manipulated for fabricating stimuli-responsive smart fluorescent systems. The tunable and switchable fluorescent materials are potential candidates for organic light-emitting diodes, information storage, chemosensors, and bioimaging applications. − …”

Acid‐Triggered Aggregation of Carbon Dots Shifted Their Emission to Give Unexpected Deep‐Red Lasing

“…These unique responsive PL properties make the CDs a good candidate for applications in these solvent systems, such as the detection of water content in organic solvents, [28] visible estimation of pH ranges, [23] and distinguishing solvents with different H bond donor acidity. [29] The structure properties of the CDs were next characterized and analyzed.…”

AIEE-active V-shaped fused-biscoumarins: synthesis, photophysical and electroluminescence properties

“…In addition, with the increase of f n-hexane , the PL emission peaks of CC-TPE, CC-TriPE and CC-TPA were obviously blue-shifted by 32, 38 and 57 nm, respectively, which could be ascribed to the morphological change in the aggregates from the amorphous to the crystalline state. 43,44 From the results of the PL behaviors of the compounds in THF/n-hexane mixtures, the compounds CC-TPE, CC-TriPE and CC-TPA exhibited the AIEE characteristics.…”