Stannaspherene. The Sn122- cluster is discovered to be a highly stable and highly symmetric icosahedral cage bonded by four delocalized radial π bonds and nine delocalized on-sphere σ bonds from the 5p orbitals of the Sn atoms. It has a diameter of 6.1 Å, with a large empty interior volume, and can host most transition metal atoms inside, giving rise to a large class of endohedral chemical building blocks for cluster-assembled nanomaterials.
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Cui et al. (2006) studied this question.
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