Abstract
The new compounds, RbU2SbS8 and KU2SbSe8, were prepared as golden-black, blocklike crystals by the polychalcogenide molten flux method. RbU2SbS8 crystallizes in the monoclinic space group Cm with a = 7.9543(9) A, b = 11.0987(13) A, c = 7.2794(10) A, β = 106.030(2)°, and Z = 2. The compound has a two-dimensional character with layers running perpendicular to the c-axis. The coordination geometry around the U4+ atoms is best described as a bicapped trigonal prism. The trigonal prisms share triangular faces with neighboring prisms, forming one-dimensional columns along the a-axis. The columns are then joined to construct sheets by sharing capping S atoms. Sb3+ ions are sitting at the center of a slightly distorted seesaw coordination environment (CN = 4). Rb+ ions are stabilized in 8-coordinate bicapped trigonal prismatic sites. KU2SbSe8 crystallizes in the monoclinic space group Cm with a = 11.5763(2) A, b = 8.2033(1) A, c = 15.2742(1) A, β = 112.22(2)°, and Z = 4. KU2SbSe8 has essentially the same structur...
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