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The crystal structures of the mixed skutterudites CoGe 1.5 S 1.5  and CoGe 1.5 Se 1.5  were determined by X-ray diffraction of powder samples and pseudomerohedral multiple twins (space group  R 3, No. 146,  Z  = 24, CoGe 1.5 S 1.5 :  a  = 1133.63(10) pm,  c  = 1391.76(9) pm,  R ( F ) = 2.2%, 4288 unique reflections; CoGe 1.5 Se 1.5 :  a  = 1173.00(8) pm,  c  = 1441.1(3) pm,  R ( F ) = 2.8%, 828 unique reflections). The triple pseudomerohedral twins are connected by three twofold rotation axes, which are linked by a threefold rotation axis. An absorption correction was performed by an intensity and volume ratio weighted empirical method. The intensity data for CoGe 1.5 Se 1.5  were collected in two different azimuth and  θ  positions in order to minimise the absorption effects. The structures obtained are compared with those of binary skutterudites with respect to symmetry relations of the space groups and bonding of the rhombic Ge 2 X 2  units (X = S, Se), which partly reveal antiaromatic 4 π  electron behavior.

X-ray structure determination of pseudomerohedrally twinned CoGe 1.5 S 1.5 and CoGe 1.5 Se 1.5 , absorption correction