Accordion‐Like Motion in Electrochemically Switchable Crown Ether/Ammonium Oligorotaxanes
| Autor: | Christoph A. Schalley, Marius Gaedke, Jan M. Wollschläger, Felix Stein, Biprajit Sarkar, Sebastian Sobottka, Hendrik V. Schröder |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Rotaxane Materials science 010405 organic chemistry Supramolecular chemistry Ether General Chemistry 010402 general chemistry Electrochemistry 01 natural sciences Catalysis Molecular machine 0104 chemical sciences chemistry.chemical_compound Crystallography chemistry Intramolecular force Crown ether Tetrathiafulvalene |
| Zdroj: | Angewandte Chemie International Edition. 58:3496-3500 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.201813265 |
| Popis: | Reversible oxidation reactions in electrochemically switchable oligorotaxanes with tetrathiafulvalene (TTF) decorated 24-crown-8 ether wheels generate intramolecular mixed-valence and radical-cation interactions between the wheels. This induces shuttling of the wheels and a contraction of inter-wheel distances. Further oxidation generates repulsive forces between the TTFs and maximizes the inter-wheel distances instead. These interactions and co-conformational changes were not observed for structurally similar controls in which acetyl groups along the axle prevent translational motion of the wheels. This operation mode of oligorotaxanes, which is reminiscent of an accordion-like motion, is promising for functional materials and nanodevices such as piston-type rotaxane motors. |
| Databáze: | OpenAIRE |
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