The key to motion: A second-generation molecular rotary motor, which contains a DB24C8 macrocycle ring incorporated into the lower stator half and a dialkyl ammonium ion attached to the upper rotor half, forms a pseudorotaxane in less polar solvents such as CH2Cl2. In this self-complexing system, acid–base-controlled threading–dethreading movements can be utilized to unlock or lock the molecular motor (see picture).
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