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The dethreading rate of a polyaminated axle flanked by two benzo-15-crown-5 stoppers from the cavity of Cucurbit[7]uril (CB[7]) was enhanced by up to 500 times in the presence of aqueous metallic and organic cations. Cations likely stabilize the highest energy transition state of the dethreading process by interacting with both crown ether and CB[7] units.
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Ling et al. (2012) studied this question.
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