Controlling a molecular brake: Binding interactions between the thread and the macrocycle of a [2]rotaxane can be tuned in a quasi-continuous manner by adding hydrogen-bond-forming solvent molecules one at a time to an isolated [2]rotaxane molecule. Conformational changes that detach the thread from the macrocycle can be induced controllably, and the system resembles a molecular version of applying and releasing a brake.
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Rijs et al. (2010) studied this question.
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