• Call for Physical Sciences Papers
  • Science Sessions: The PNAS Podcast Program
July 17, 2012; 109 (29)

Cover image

Cover image expansion

Cover image: Pictured is a graphical representation of intramolecular electron transfer in a dumbbell-shaped [2]rotaxane molecule, designed to act as a molecular switch in nanoelectronic devices. In the molecule’s ground state, an aromatic ringed structure (blue) encircles an electron-rich region (red spheres). Jonathan C. Barnes et al. (pp. 11546–11551) show that upon addition of three electrons (grey spheres with minus signs) the ring shuttles along the dumbbell to encircle an electron-poor region (blue spheres), inducing intramolecular electron transfer. The Electrochemistry Special Feature provides a snapshot of current themes and developments in the field of electrochemistry. See the special feature introduction by Allen J. Bard and Royce W. Murray on pages 11484–11486. Image courtesy of Aleksandr Bosoy (Stoddart Research Group, Northwestern University).

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