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Volume 15 Issue 1, January 2020

The ins and outs of diradical nanographene

Clar’s goblet is a polycyclic aromatic hydrocarbon with an unconventional source of magnetism. This bow tie shaped nanographene, which was predicted by Erich Clar in the 1970s, possesses an even number of carbon atoms and π-electrons, but the connectivity of the carbon atoms prohibits pairing of all electrons into π-bonds. The resulting diradical character makes the molecule very reactive and, thus, unstable under standard conditions. Mishra, Beyer and colleagues have now synthesized Clar’s goblet on a gold surface under ultra-high vacuum conditions. By means of low-temperature scanning tunnelling microscopy and spectroscopy, they have unveiled the structure of the molecule and its antiferromagnetic ground state, and controllably manipulated the radical character. The cover art is based on a scanning probe image revealing the carbon–carbon bond structure of Clar’s goblet and shows an artificial ensemble of nine molecules.

Letter by Fasel et al.; N&Vs by Melle-Franco

IMAGE: Pascal Ruffieux, Empa. COVER DESIGN: Bethany Vukomanovic

Editorial

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  • We reflect on the major role played by Nano Letters in nanoscience and nanotechnology and celebrate the appointment of its new editor-in-chief.

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  • Chris Toumey explores the way in which reactions to nanotechnology from different religious denominations can be translated to other emerging technologies.

    • Chris Toumey
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News & Views

  • Nanostructures of electrically conducting polymers show plasmonic behaviour that indicates their promise as switchable optical materials.

    • Drew Evans
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  • The elusive Clar goblet, a magnetic, bowtie shaped nanographene is now synthesized and its peculiar magnetic ground state is characterized.

    • Manuel Melle-Franco
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  • Desalination membranes based on the water transport through transient channels shows a new way to achieve high permeability and selectivity

    • Aleksandr Noy
    • Meni Wanunu
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  • Tellurium thin films evaporated at cryogenic temperatures facilitate the realization of high performance wafer-scale flexible p-type field-effect transistors and various types of logic gates.

    • Seungjun Chung
    • Takhee Lee
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