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The IO₃ groups in Na₂Sn(IO₃)₆ are aligned in a parallel manner attributed to the six-coordinate Na⁺ cation, whereas the IO₃ polyhedra in Cs₂Sn(IO₃)₆ rotate with respect to Sn⁴⁺ due to the nine-coordinate Cs⁺ cation.
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Kim et al. (2015) studied this question.
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