Achieving highly efficient aggregation-induced emission, reversible and irreversible photochromism by heavy halogen-regulated photophysics and D–A molecular pattern-controlled photochemistry of through-space conjugated luminogens

Abstract

It is extremely challenging but desirable to regulate photophysical and photochemical processes of aggregation-induced emission luminogens (AIEgens) in distinct state in a controllable manner. Herein, we design two groups of...

Hydrogen Bond Organic Frameworks as a Novel Electrochemiluminescence Luminophore: Simple Synthesis and Ultrasensitive Biosensing

“…The Hirshfeld surfaces of these phenyDAT derivatives are almost blue, while many N sites are red, suggesting the stronger N···H bond at most of the intermolecular contacts with a bond length of about 2.57 Å. These contacts comprise 31.7% of the N···H bond on the total Hirshfeld surfaces for phenyDAT, without any C–C bond observed (Figure S1B), which accounts for the main formation of the hydrogen bond by self-assembly, rather than the π–π stacking of the ligands .…”

Rational Design and Facile Synthesis of Dual‐State Emission Fluorophores: Expanding Functionality for the Sensitive Detection of Nitroaromatic Compounds

“…The intermolecular interaction in the crystal structures of 4 a was further investigated via Hirshfeld surface analysis. Figure 4e shows the Hirshfeld surfaces of 4 a mapped over d norm , where the red spots in map indicate the strong interactions between the molecules, but almost areas of blue and white indicate the weak intermolecular interaction [59,60] . Due to the steric hindrance and twisted molecular configuration created by aryl rings on TPA, there is weak π–π stacking between the molecules.…”

“…Figure 4e shows the Hirshfeld surfaces of 4 a mapped over d norm , where the red spots in map indicate the strong interactions between the molecules, but almost areas of blue and white indicate the weak intermolecular interaction. [59,60] Due to the steric hindrance and twisted molecular configuration created by aryl rings on TPA, there is weak π-π stacking between the molecules. Furthermore, the intermolecular CÀ H•••π interaction between phenyl rotors and benzimidazole may rigidify the conformation and restrict intramolecular motion (Figure 4c).…”

Multiwavelength-controlled multicolor photochromism and fluorescence switching based on an efficient photocyclization reaction by introducing two photoactive subunits into AIEgens

“…26 Generally, there are four paths: (1) directly mixing AIEgens with photochromic molecules, (2) combining AIEgens with photochromic molecules via chemical bonding, 27,28 (3) combining AIEgens with photochromic molecules via host–guest interaction, and (4) novel molecule system design. 29–32 However, all these dual-mode molecules have a serious limitation in that the switch must be triggered by UV light in at least one direction, which shows a huge destructive effect in biotechnology. 33 In comparison, the low-energy visible/near-infrared light is undeniably more suitable to practical applications owing to its low phototoxicity, high permeability and low background signals.…”