Relatively ionic: The new platinide Cs2Pt is dark red and transparent. The calculated band structure shows a complete transfer of the valence electrons from cesium to platinum, which exists as a Pt2− ion. This result is further experimental evidence for a relativistic lowering of the 6s orbital energy. The crystal structure, a Ni2In structure type (see picture; Cs yellow, Pt blue), is a high-pressure polymorph of the CaF2 structure. Hence, according to the pressure-homologue rule Cs2Pt can be considered as a homologue of the alkali-metal chalcogenides.
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Karpov et al. (2003) studied this question.
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