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

Abstract

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.

Vertical Assembly of Giant Double‐ and Triple‐Decker Spoked Wheel Supramolecular Structures

“…As an important part of supramolecular chemistry, coordination-driven self-assembly has attracted considerable attention owing to its promising applications in diverse fields, such as host–guest chemistry, [1] catalysis, [2,3] sensing, [4,5] biology, [6] and optical materials. [7] A series of high molecular-weight supramolecular architectures with precise shapes and sizes, from two-dimensional (2D) metallo-macrocycles [2,4,8] to three dimensional (3D) cages, [2,8a,9] polyhedra [10] and intricate molecular knots, [11] have been extensively reported.…”

Photoresponsive, Water‐Soluble Supramolecular Dendronized Polymer with Specific Lysosome‐Targetable Bioimaging Application in Living Cells

“…For example, α‐cyclodextrins behave as good host to capture structural units such as azobenzene, alkyl chain, polyethylene oxide . β‐cyclodextrins can form photoresponsive 1D and 2D nanostructures with diphenylalanine . While for largest cavity host γ‐cyclodextrins (γ‐CD), they can even encapsulate two pyrene moieties .…”

“…[21][22][23] β-cyclodextrins can form photoresponsive 1D and 2D nanostructures with diphenylalanine. [24] While for largest cavity host γ-cyclodextrins (γ-CD), they can even encapsulate two pyrene moieties. [25] Despite great progresses in this field, cyclodextrin-based high-degree fluorescent supramolecular poly mers in aqueous solution are still not easy to be obtained due to the poor solubility of organic dyes.…”

Tunable Supramolecular Nanoarchitectures Constructed by the Complexation of Diphenanthro‐24‐Crown‐8/Cesium(I) with Nickel(II) and Silver(I) Ions

“…We previously reported photocontrolled reversible conversion of assemblies by the trans/cis isomerization of azobenzene and a variety of tunable morphologically interesting aggregates constructed by host-guest complexation. [5] Motivated by our ongoing interest on the morphologically conversion of nanosupramolecular assemblies and potential application in material manufacturing, herein we report a diphenanthro-24-crown-8 (DPC) which can be regulated from nanofibers to regular nanoribbons and then to nanospheres and nanoparticles by different metals (Scheme 1). A key to achieve this multilevel manipulation was the accurate utilizing of four different noncovalent forces provided by DPC and ethanol: the π-π stacking of 1,10-phenanthroline group, the ion-dipole interactions of crown ether motif with alkalis, the coordination interactions of 1,10-phenanthroline with transition metals and the H-bond between DPC and ethanol.…”