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 springloaded;[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 ...
