Low-lying electronic transitions are observed in the photoelectron spectra of [Ta3O3]−, and ab initio calculations show that the cluster has a planar D3h triangular structure. Totally delocalized, multicenter metal–metal bonding renders δ aromaticity for [Ta3O3]− (see picture). This is the first δ-aromatic molecule to be confirmed both experimentally and theoretically.
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Zhai et al. (2007) studied this question.
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