THE CRYSTAL STRUCTURE OF K2TeBr6

Crystals of K 2 TeBr 6 are monoclinic, space group [Formula: see text] with a = 7.521, b = 7.574, and c = 10.730 Å; β = 89° 40′. Atomic positions have been found by three dimensional X-ray diffraction analysis (least squares R = 0.12). The crystals possess a K 2 PtCl 6 structure which is distorted to allow a more efficient packing of the comparatively large anions than is possible with the undistorted cubic form. The stereochemistry of the octahedral TeBr 6 − ion (Te—Br = 2.71 Å) is discussed.