Aggregation-induced emission: mechanistic study of the clusteroluminescence of tetrathienylethene

Abstract

Crystallization induced S···S interactions leading to an unusual luminescent phenomenon.

Aggregation‐Induced Emission Characteristics of o‐Carborane‐Functionalized Tetraphenylethylene Luminogens: The Influence of Carborane Cages on Photoluminescence

“…Restricted intramolecular rotation( RIR) mechanism has been recruited to explain the above AIE behaviors. [1,10] In solution circumstance, TPE (compound M)m olecules experience minimal interactions from each other.T herefore, when looselys urrounded by solventm olecules, each of the phenyl rings of compounds 1-4 and M could rotate and vibrate freely. Upon excitation,t hese unrestricted intramolecular motions tend to dissipate energy and drive molecules back to the ground states via non-radiativep rocesses, resultingi nw eak solution emission.…”

AIE-active non-conjugated poly(N-vinylcaprolactam) as a fluorescent thermometer for intracellular temperature imaging

“…The rigidity of the molecular conformation restricts vibration and molecular rotation which efficiently suppresses the non-radiative relaxation. 25 Consequently, the polymer exhibits noticeable emission upon irradiation in the aggregated state.…”

Tetrathienylethene‐based Positional Isomers with Aggregation‐induced Emission Enabling Super Red‐shifted Reversible Mechanochromism and Naked‐eye Sensing of Hydrazine Vapor

“…The peaks at 320, 343 and 367 nm for TTE-o-PhCHO, TTE-m-PhCHO and TTE-p-PhCHO are attributed to the p-p* transition of the central TTE skeleton, and the peaks at 411, 437 and 455 nm are due to the whole conjugated structures. [17] The distinct red-shift of the absorption bands are ascribed to the increasing of the effective conjugation degree and electron-withdrawing effect in ortho-, meta-to para-substituent isomers. [8] The isomers in THF solution exhibit emission peaks at 498, 527 and 541 nm for TTE-o-PhCHO, TTE-m-PhCHO and TTE-p-PhCHO (Figure 1 B and Table 1).…”

“…[4a] Although several such examples have been reported, sensitive detection of hydrazine vapor using solid carriers is also challenge. [4,16] In this work, three positional isomers, TTE-o-PhCHO, TTE-m-PhCHO and TTE-p-PhCHO, were designed and synthesized by introducing ortho-, meta-and para-formylphenyl groups to the central AIE-active tetrathienylethene [17] (TTE) skeleton. Owing to the propeller-shape structure, twisted conformation and the substitution effect for electronic cloud contribution, the three isomers exhibit diverse photophysical properties, differentiated sensitivity to mechanical grinding and fluorescent response to hydrazine.…”