Yttrium triiodide, YI₃

Single crystals of YI₃ were obtained by high-vacuum sublimation of the crude product at 1213 K. The crystal structure is that of the BiI₃ structure type. Two-thirds of the octa­hedral voids between every second hexa­gonally closest-packed layer of I⁻ ions are occupied by Y³⁺ ions. Thereby, the YI₆ octa­hedra share common edges within Bγ_2/3A slabs in the stacking sequence ...γ_2/3A□Bγ_2/3A□Bγ_2/3A□Bγ_2/3....

Scandium(III) oxide bromide, ScOBr

Single crystals of scandium oxide bromide, ScOBr, were obtained as a by-product of the reaction of scandium tribromide, ScBr₃, and scandium metal in a sealed tantalum container. ScOBr crystallizes with the FeOCl structure type. Br_1/2Sc_1/2OSc_1/2Br_1/2 slabs are stacked in the direction of the c axis. Sc³⁺ is surrounded in a distorted octa­hedral fashion according to the Niggli notation ScO_4/4Br_2/2.