Light-Driven Aqueous Dissipative Pseudorotaxanes with Tunable Fluorescence Enabling Deformable Nano-Assemblies

Developing an artificial dynamic nanoscale molecular machine that dissipatively self-assembles far from equilibrium is fundamentally important but is significantly challenging. Herein, we report dissipatively self-assembling light-activated convertible pseudorotaxanes (PRs) that show tunable fluores...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2023-03, Vol.15 (8), p.11004-11015
Main Authors: Hou, Xiao-Fang, Chen, Xu-Man, Bisoyi, Hari Krishna, Qi, Qi, Xu, Tianchi, Chen, Dongzhong, Li, Quan
Format: Article
Language:English
Subjects:
Applications of Polymer, Composite, and Coating Materials
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Summary:Developing an artificial dynamic nanoscale molecular machine that dissipatively self-assembles far from equilibrium is fundamentally important but is significantly challenging. Herein, we report dissipatively self-assembling light-activated convertible pseudorotaxanes (PRs) that show tunable fluorescence and enable deformable nano-assemblies. A pyridinium-conjugated sulfonato-merocyanine derivative (EPMEH) and cucurbit[8]­uril (CB[8]) form the 2EPMEH ⊂ CB[8] [3]­PR in a 2:1 stoichiometry, which phototransforms into a transient spiropyran containing 1:1 EPSP ⊂ CB[8] [2]­PR when exposed to light. The transient [2]­PR thermally relaxes (reversibly) to the [3]­PR in the dark accompanied by periodic fluorescence changes that include near-infrared emission. Moreover, octahedral and spherical nanoparticles are formed through the dissipative self-assembly of the two PRs, and the Golgi apparatus is dynamically imaged using fluorescent dissipative nano-assemblies.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.2c20276