1 research outputs found
Multi-Stimuli-Responsive Fluorescence Switching from a Pyridine-Functionalized Tetraphenylethene AIEgen
The
discovery of the striking aggregation-induced emission (AIE) phenomenon
has opened a new avenue for smart light-emitting materials. Herein,
a new AIE luminogen (AIEgen), 1,1,2,2-tetrakisÂ(4-((<i>E</i>)-2-(pyridin-2-yl)Âvinyl)Âphenyl)Âethene (TP2VPE), has been designed
and synthesized by introducing the vinylpyridine motifs into the tetraphenylethene
backbone. The emission spectrum of the new obtained AIEgen crystalline
material can be switched in response to not only mechanical grinding
and hydrostatic compression but also the protonation effect with excellent
reversibility and reproducibility. Single-crystal X-ray structural
analysis disclosed the supramolecular porous channel structure, which
provides a shrinkable volume to maintain the fluorescence emission
upon high pressure. Furthermore, protonation–deprotonation
of the pyridine moieties in TP2VPE has a significant effect on the
frontier molecular orbitals as well as very distinctive emission characteristics
upon acid and base stimuli. The dual-response performance and the
ease of its preparation and renewal endow the material with potential
applications in pressure and acid/alkali fluorescence sensing