Abstract
Dimers containing a four-membered Sb2O2 ring with antimony atoms in distorted trigonal-bipyramidal co-ordination were obtained when either diphenylantimony(III) chloride or bromide was oxidised with tert-butyl hydroperoxide; the crystal structure of [SbPh2O(Br)]2 has been determined. Related reactions with the corresponding fluoride and thiocyanate gave products with the same stoichiometry but X-ray crystallography showed these are centrosymmetric tetramers, X2Ph2SbO(Ph2SbO2SbPh2)OSbPh2X2, which also contain a central four-membered ring. A possible mechanism for formation of these tetramers is presented. Oxidation of phenylantimony dichloride and dibromide on the other hand gave only rearrangement and decomposition products.
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