Control of Planar Chirality: The Construction of a Copper‐Ion‐Controlled Chiral Molecular Hinge

An open-and-closed case: When a chiral clamp is attached to a molecular hinge the open–close motion induced by coordination to a metal ion becomes unidirectional (see scheme). The large change in amplitude caused by the unidirectional rotation and the relatively simple preparation of the hinge open up the possibility of using this concept for even more-complex molecular machines.