MODELLING DISORDERS IN [Hpy] ₈[Sb₄Br₁₂Cl₈]

A.J. Blake, M.J. Begley, M. Nunn and D.B. Sowerby

Department of Chemistry, University of Nottingham, Nottingham NG7 2RD

We have been interested in the structures of antimony(III) haloanions, both those which are purely inorganic [1] and those containing phenyl groups [2]. The work reported here represents an extension to systems containing both bromine and chlorine. Our interests lie in determining the degree of polymerisation which occurs and in which halide occupies the bridging positions.

A structure determination showed that the title compound contains the tetrameric [Sb₄Br₁₂Cl₈]^8- anion (see Figure), with the antimony(III) centres bridged by bromides. The majority of the remaining halides are affected by disorder and the modelling of this will be described.

1. M. Hall, M. Nunn, M.J. Begley & D.B. Sowerby, J. Chem. Soc., Dalton Trans.,1986,1231. [2] M. Hall & D.B. Sowerby, J. Organometal. Chem.,1988, 347, 59