Multiple Stimuli-Responsiveness Fluorescent Probe Derived from Cyclopolymers and Pyrene-Ended Ammonium Salts

A multiple stimuli-responsiveness fluorescent probe was fabricated by host-guest recognition between cyclopolymers with larger pseudocrown ether cavities in the backbones and pyrene-ended ammonium salts. Also, this fluorescent probe exhibits ratiometric responsiveness to chloride anions, organic bases, and temperature, as well as a dual luminescence responsiveness to nitro-compounds. These properties of this probe endow it with potential application in multiple stimuli-responsive chemical fluorescence sensors. Moreover, it was found that the cyclopolymers with pyrenes grafted on the backbone increased the excimer/monomer emission ratio of the fluorescent polypseudorotaxane, which would be expected to present higher sensitivity and responsiveness to an external environment or stimuli-factors.