AI Article Synopsis
- Molecular machines like (pseudo) rotaxanes have dynamic capabilities, but it's tough to achieve noticeable mechanical responses at a larger scale.
- Researchers developed a metal-organic rotaxane compound, U-CB[8]-MPyVB, which uses a special macrocyclic structure to enable controllable mechanical responses when exposed to light.
- The compound demonstrates a unique solid-state transformation that triggers bending in bulk crystals, paving the way for advanced applications in areas like optomechanics and smart robotics.
Article Abstract
Molecular machines based on mechanically-interlocked molecules (MIMs) such as (pseudo) rotaxanes or catenates are known for their molecular-level dynamics, but promoting macro-mechanical response of these molecular machines or related materials is still challenging. Herein, by employing macrocyclic cucurbit[8]uril (CB[8])-based pseudorotaxane with a pair of styrene-derived photoactive guest molecules as linking structs of uranyl node, we describe a metal-organic rotaxane compound, U-CB[8]-MPyVB, that is capable of delivering controllable macroscopic mechanical responses. Under light irradiation, the ladder-shape structural unit of metal-organic rotaxane chain in U-CB[8]-MPyVB undergoes a regioselective solid-state [2 + 2] photodimerization, and facilitates a photo-triggered single-crystal-to-single-crystal (SCSC) transformation, which even induces macroscopic photomechanical bending of individual rod-like bulk crystals. The fabrication of rotaxane-based crystalline materials with both photoresponsive microscopic and macroscopic dynamic behaviors in solid state can be promising photoactuator devices, and will have implications in emerging fields such as optomechanical microdevices and smart microrobotics.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9019062 | PMC |
| http://dx.doi.org/10.1038/s41467-022-29738-y | DOI Listing |
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