Disk Aromaticity of the Planar and Fluxional Anionic Boron Clusters B₂₀−/2−

The presence of excess electrons modifies the structural landscape and tends to extend the planarity of boron clusters. While the neutral B20 is tubular, both the anion and dianion B20−/2− become planar. Geometrical features of the stable anions suggest the existence of a new type of cluster that is planar and doubly cyclic with one atom located at the center (see figure), as well as being fluxional. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.