Unusual Aromaticity in Boron Wheels

  • ChemPubSoc Europe Logo
  • Author: ChemViews
  • Published Date: 04 September 2011
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Unusual Aromaticity in Boron Wheels

The chemical bonding in wheel-like planar boron clusters is remarkable; in addition to the strong and localized bonding in the circumferences, there are two types of delocalized bonding—the in-plane σ and the out-of-plane π bonding, each of which follows the (4N+2) Hückel rule for aromaticity.

Lai-Sheng Wang and colleagues, Brown University, Rhode Island, USA, have made boron rings with a central metal atom. The Co©B8 and Ru©B9 clusters are unprecedented in chemistry due to their coordination numbers of 8 and 9 in perfect planar environments and the multiple aromaticity achieved by boron’s ability to form multicenter bonds

Because of the central position of the transition-metal atom, appropriate ligands may be conceived for coordination above and below the molecular plane, thus rendering chemical protection and allowing syntheses of this new class of novel boron-based metal complexes with unexpected chemical properties.

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