It's platonic: The Pt centered [Pb12]2− icosahedron (depicted) was prepared from the [Pb9]4− Zintl ion and [Pt(PPh3)4] in good yield. The anion has virtual Ih point symmetry and is a rare example of a free-standing carbon-free aromatic inorganic cluster.
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Esentürk et al. (2004) studied this question.
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