Abstract
The temperature dependence of the crystal structure of Potassium Hexaiodoplatinate(IV) between 80 and 500 K is described. Below 410 K, K2PtI6 adopts a monoclinic structure described in space group P21/n due to the presence of tilting of the PtI6 octahedra. Heating the sample to above 410 K results in the loss of the out-of-phase tilts and a transition to the previously described tetragonal structure in space group P4/mnc. The remaining in-phase tilts are lost upon heating to above 460 K where the structure is cubic in space group Fm3‾m.It is anticipated that the identification of accurate structures for the three polymorphs of K2PtI6 will stimulate further theoretical and practical studies.
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