Schiff base derivatives containing thiodiazole: Twisted molecular conformation avoiding π … π stacking promotion aggregation-induced emission enhancement

Conjugated Carbazole‐Based Schiff Bases as Photoinitiators: From Facile Synthesis to Efficient Two‐Photon Polymerization

“…The absence of fluorescence should be attributed to the isomerization/rotation of C=N group, which dissipate the absorbed energy via radiationless relaxation. On the other hand, Schiff base compounds are usually reported to display AIE property due to the intramolecular hydrogen bond which restricted the intermolecular rotation process . Figure showed the fluorescence emission of A3‐1 measured in the mixed solvents with different water content (vol %) (fluorescence spectra of other 2PIs, see Fig.…”

A dual‐function chemosensor based on coumarin for fluorescent turn‐on recognition of Hg2+ and colorimetric detection of Cu2+ in aqueous media

“…Coumarin and its derivatives are a particular class of heterocyclic compounds, which have a great significance in various fields of science and technology such as pharmaceutics, optical materials, chemosensors, and solar energy materials . Thiodiazole molecule is a highly conjugated aromatic heterocyclic and its derivatives have vast potential and demands in disinfection, weedicide, and sterilization applications as they possess a variety of biological activities . However, compounds that bind coumarin and thiodiazole groups together are relatively rare.…”

CF3 H-bonding locked aromatic stacking of picric acid with mechanofluorochromic fluorophores: highly selective reusable sensor and rewritable fluorescence platform

“…To this solution, CF 3 /CH 3 substituted phenylacetonitrile (1.3 equivalents) and sodium methoxide (2 equivalents) were added, and the reaction mixture was stirred at room temperature for 2 h. Finally, the reaction mixture was cooled to room temperature, and the product was filtered and washed with cold methanol. 13 C NMR (150 MHz, CDCl 3 ) δ 142.95, 140. 38, 140.31, 131.82, 131.23, 127.10, 126.46, 126.31, 123.92, 120.71, 120.57, 117.59, 110.68…”

“…10,11 Twisted molecular structure prevents aromatic π-stacking, and weak intermolecular interactions rigidify the fluorophores and restrict the intramolecular rotation that facilitates enhanced radiative processes. [12][13][14][15] The conformational freedom and delicacy of intermolecular interactions were further utilized to achieve stimuli-responsive fluorescence switching. 16,17 Tailoring the fluorophore structure is one important tool employed for deriving desirable/unexpected functional properties in the resulting fluorescent materials.…”