Abstract
The compound Rb 3 Bi 2 I 9 was synthesized by melting a stoichiometric mixture of RbI and BiI 3 and annealing for 1 month some degrees below the melting temperature of 785±5K; a large single crystal of the title compound has been grown from the melt by directional solidification using the vertical Bridgman-Stockbarger technique. X-ray structure determination of the compound involved single-crystal diffractometry, direct and Patterson methods and least-squares refinement. Rb 3 Bi 2 I 9 exhibits a new type of crystal structure, crystallizing in the monoclinic space group Pc with unit-cell parameters a =14.690(4), b =8.195(2), c =25.645(6) Å, β =125.39(2)°, V =2517(2) Å 3 , Z =4. The unit-cell of Rb 3 Bi 2 I 9 has six pseudohexagonal RbI 3 layers which are stacked along the direction near to the normal of the XY plane. Each BiI 6 octahedron shares three corners with three other octahedra to form parallel Bi 2 I 9 corrugated layers intersecting Z axis of the structure at an angle near 120°.
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