Two multi-Functional aggregation-Induced emission probes: Reversible mechanochromism and bio-imaging

Microcrystal Electron Diffraction Elucidates Water-Specific Polymorphism-Induced Emission Enhancement of Bis-arylacylhydrazone

“…During the past decades, aggregation-induced emission (AIE) luminogens (AIEgens) have been widely investigated as an attractive tool in various fields, such as organic light-emitting diodes (OLEDs), − sensors, − and bio-imaging − with an excellent performance. Unlike most organic luminogens, which display a strong emission in solution but are quenched by aggregation or crystallization owing to strong intermolecular interactions such as π–π, AIEgens show a strong and enhanced emission in aggregated states with the presence of hydrogen bonding and π–π stacking interactions .…”

Selective Cu2+ Ion Sensing by Nanoaggregates of Pyridyl‐2,6‐bis(3‐allylsalicylaldehyde)hydrazone

“…Therefore, the observation of several components in the ESI‐MS spectra is to be expected. The adducts formed by self‐assembly will have an undefined network structure and H‐bonding plus weaker interactions may be involved in the self‐assembly process ,…”

Twisted Donor−π–Acceptor Carbazole Luminophores with Substituent-Dependent Properties of Aggregated Behavior (Aggregation-Caused Quenching to Aggregation-Enhanced Emission) and Mechanoresponsive Luminescence

“…Organic luminescent materials that can change their solid-state fluorescence emission color in response to external mechanical stimuli (such as grinding, cutting, etc), named mechanochromic (MC) materials, − have gained increasing interest for their wide applications as information security, memory devices, and mechanosensors. − A number of MC materials have been synthesized to date. − However, MC materials, compared with other materials, remain limited in number owing to the lack of a clear guideline on the design strategy. ,,− Especially, another main reason is the fact that many luminophores with π-conjugated system generally suffer from aggregation-caused quenching (ACQ) effect and display very weak emission or even become nonemissive in their aggregated states, which greatly hinder their practical use. − To overcome this problem, the aggregation-induced emission (AIE)- or aggregation-enhanced emission (AEE)-active molecules that can display strong emission in the aggregated states are employed as ideal building blocks for MC materials. In 2010, Park and his partners reported a novel cyano-distyrylbenzene derivative that displayed AIE and MC characteristics .…”