Perfect symmetry: Photoelectron spectroscopy and theoretical calculations show that the B8 and B9 rings are stabilized by the metal atoms in Co©B8− and Ru©B9−, which possess D8h and D9h symmetry, respectively (see picture). The bonding between the metal atom and the boron ring is described by six delocalized σ electrons and six delocalized π electrons, which result in double aromaticity.
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Romanescu et al. (2011) studied this question.
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