Photolockable ratiometric viscosity sensitivity of cyclodextrin polypseudorotaxane with light-active rotor graft.
A prototype, based on light-active fluorescent rotor grafted to beta-cyclodextrin, shows a good solvent viscosity-sensitive behavior due to the environment-dependent nonradiative decay. With the reversible photoisomerization of the cyanostilbene unit, the viscosity sensitivity of the molecular rotor could be locked and activated, and the two switchable states can be distinguished by fluorescent signals. This cyclodextrin derivative was threaded to form a novel polypseudorotaxane. Such supramolecular assembly displays a lockable ratiometric fluorescent viscosity sensitivity with two emission channels: one aroused by fluorophore's intramolecular excimer without influenced by viscosity is used to gauge the concentration of the compound, while the other corresponding to the monomer's rotor fluorescence acts as a viscosity-sensitive signal and it can be shut off by UV irradiation.
Zhu
Liang-Liang
LL
Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, PR China.
Li
Xin
X
Ji
Feng-Yuan
FY
Ma
Xiang
X
Wang
Qiao-Chun
QC
Tian
He
H
D001672:Biocompatible Materials / Q000737:chemistry; D003505:Cyclodextrins / Q000737:chemistry*; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D008968:Molecular Conformation; D010777:Photochemistry / Q000379:methods; D043862:Rotaxanes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013267:Stilbenes / Q000737:chemistry; D043823:Taxoids / Q000737:chemistry*; D014466:Ultraviolet Rays; D014783:Viscosity; D047392:beta-Cyclodextrins / Q000737:chemistry
D001672:Biocompatible Materials; D003505:Cyclodextrins; D043862:Rotaxanes; D012997:Solvents; D013267:Stilbenes; D043823:Taxoids; D047392:beta-Cyclodextrins; C031215:betadex