Tunable Supramolecular Assembly and Photoswitchable Conversion of Cyclodextrin/Diphenylalanine‐Based 1D and 2D Nanostructures

A photocontrolled, interconvertible supramolecular 2D‐nanosheet/1D‐nanotube system was constructed through the supramolecular assembly of adamantanyl‐modified diphenylalanine with azobenzene‐bridged bis(β‐cyclodextrin). The nanosheet exhibited a greater fluorescence enhancement effect than the nanotube. Significantly, these nanosheets and nanotubes could interconvert via the photocontrolled trans/cis isomerization of azobenzene linkers in bis(β‐cyclodextrin), and this photo‐switchable one‐dimensional/two‐dimensional morphological interconversion was reversible and recyclable. This enables convenient routes to highly ordered nanostructures with various morphologies and dimensions that can be controlled by external stimuli. Flip the switch: Nanofibers, self‐assembled by adamantanyl‐modified diphenylalanine, are converted into nanosheets and nanotubes upon the addition of trans‐ and cis‐azobenzene‐bridged bis(β‐cyclodextrin), respectively. Significantly, these nanosheets and nanotubes can reversibly and repeatedly interconvert upon light irradiation at 365 nm or 450 nm.