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A new type of polyhedron: An {Sn14} enneahedron, which can be derived from a trigonal bipyramid by truncating the three equatorial vertices, occurs in linear chains in Na29Zn24Sn32 (see picture; Sn blue). A pseudorotation of the {Sn14} enneahedron allows the number of covalent interactions within the complex three-dimensional atom arrangement to be adjusted, so that an electron-precise Zintl phase is attained.
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Kim et al. (2007) studied this question.
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