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Keywords:

  • aromaticity;
  • boron;
  • concentric π systems;
  • density functional calculations;
  • molecular dynamics
Thumbnail image of graphical abstract

The magic roundabout: The B19 cluster behaves like a molecular Wankel engine (see picture) in which the two concentric boron rings rotate in opposite directions. During the rotation the cluster remains planar owing to a marginal rotational energy barrier.