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Download fileDual-Stimuli-Responsive Fluorescent Supramolecular Polymer Based on a Diselenium-Bridged Pillar[5]arene Dimer and an AIE-Active Tetraphenylethylene Guest
journal contribution
posted on 2017-07-24, 20:43 authored by Yan Wang, Ming-Zhe Lv, Nan Song, Zeng-Jie Liu, Chunyu Wang, Ying-Wei YangWe
report a new strategy to construct a multi-stimuli-responsive
fluorescent supramolecular polymer by the strong host–guest
interactions between a diselenium bond-bridged pillar[5]arene dimer
and an AIE-active tetraphenylethylene (TPE)-containing neutral guest
bearing two imidazole terminal binding sites. The resulting supramolecular
polymer shows a remarkable fluorescence emission decrease at low concentration.
Significantly, the diselenium bonds introduced into the supramolecular
polymer serve as redox-responsive building blocks. Upon addition of
reductants, the supramolecular polymer depolymerized owing to the
cleavage of the covalent diselenium bonds in the system. On the other
hand, competitive guests such as adiponitrile, which bind strongly
with pillar[5]arenes, could lead the disassembly of the polymer to
oligomers without breaking any covalent bonds in the system. These
two types of depolymerization approaches can both result in the fluorescence
intensity recovery of the system to a certain extent, which will hopefully
enrich the methodology toward the construction of smart supramolecular
polymeric materials with different properties.