Control of directionality is of paramount importance if rectified motion in electroactive molecular machines should be realized. As illustrated in the cover artwork, the tetracationic ring (blue) in a tetraoxidized rotaxane can follow two different tracks; it transpires that it is easier for the ring to follow a track in which it has to move across a monopyrrolotetrathiafulvalene dication (dark green) compared to the track in which it moves across a tetrathiafulvalene dication (light green).
Jensen, M., Kristensen, R., Andersen, S. S., Bendixen, D., & Jeppesen, J. O. (2020). Cover Feature: Probing the Electrostatic Barrier of Tetrathiafulvalene Dications using a Tetra‐stable Donor–Acceptor Rotaxane (Chem. Eur. J. 28/2020). Chemistry - A European Journal, 26(28), 6087-6087. https://doi.org/10.1002/chem.202000973