Structural Studies of Potassium Hexaiodoplatinate(IV) K2PtI6

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 inphase tilts are lost upon heating to above 460 K where the structure is cubic in space group Fm3m. It is anticipated that the identification of accurate structures for the three polymorphs of K2PtI6 will stimulate further theoretical and practical studies.

Automated summary

The temperature dependence of the crystal structure of Potassium Hexaiodoplatinate(IV) between 80 and 500 K is studied. Different crystal structures are observed at different temperatures, including monoclinic, tetragonal, and cubic structures. Accurate determination of the structures of K2PtI6 is important for further theoretical and practical research.