Abstract
The crystal structure of Sb 8O 11Cl 2 (onoratoite) is redetermined in the triclinic space group P-1. The crystal structure was previously described by a partially disordered model in the monoclinic space group C 2 / m containing some partially occupied oxygen atoms. The new structural model features exclusively atomic positions that are fully occupied. The crystal structure was solved from single crystal data and the unit cell parameters are a = 10.317 ( 2 ) Å , b = 11.269 ( 2 ) Å , c = 13.939 ( 3 ) Å , α = 79.29 ( 2 ) ° , β = 76.29 ( 2 ) ° , γ = 73.00 ( 2 ) ° , Z = 2 , R = 0.0637 . It contains antimony oxide in the form of infinite tubes interleaved with halide ions, a main feature very similar to the previous model. However, in the new model the tubes contain both [SbO 4E] (E = 5s 2 lone pair of electrons) trigonal bipyramids and [SbO 3E] tetrahedral, whereas the old model was composed entirely of trigonal bipyramidal [SbO 4E] units. The isostructural compound Sb 8O 11Br 2 was synthesized as well.
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