Abstract
The crystal structure of potassium chloroptatinate, K2PtCI6, has been refined from both single-crystal and powder X-ray diffraction data. The system is cubic, space group Fm3m with a= 9.751 +_ 0.005 A. The measured density is 3-47 + 0-01 g cm -a and the calculated density for Z = 4 is 3.478 g cm -3. Interatomic distances are Pt-CI, 2.323 (1) A, CI-Cl, 3.285 (2) A (in the same octahedron), 3-610 (2) A (in adjacent octahedra) and K-CI, 3.449 (1) A. For the two determinations the values of the chlorine atom position parameter agree within one standard deviation and the temperature factors agree relatively; however, the powder method yielded temperature factors which were slightly larger. The results suggest that the powder method, when applied to high-symmetry systems with small numbers of variable parameters, yields refined parameters comparable in reliability to those from the single-crystal method.
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