Abstract
Molecular devices reproduce on the nanoscale functions of macroscopic objects – at least notionally:[1] self-assembled capsules are reaction flasks;[2] catenanes and rotaxanes are machines;[3] cylindrical molecular containers can be spring-loaded[4] and any number of biaryl nanomachines behave as rotors.[5] On/off switches involving extension/contraction motions[6] are among the oldest[7] molecular devices and here we revisit the conformational changes offered by bipyridine rotors to regulate access to a deep cavitand.
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