Organoantimony(V) oxido cubane cluster [(p-X-C < inf > 6 < /inf > H < inf > 4 < /inf > Sb) < inf > 4 < /inf > (O) < inf > 4- < /inf > (Ph < inf > 2 < /inf > SiO < inf > 2 < /inf > )] (X = Cl, Br) stabilized by diphenyldisiloxides

Abstract

Reaction of (p-halophenyl)stibonic acid with diphenylsilanediol (in ratio 1:1) in refluxing toluene for 6 h afforded colorless crystalline products in high yields. Singlecrystal X-ray structural elucidation reveals the formation of'theproducts [(P-Cl-C6H4Sb)4(O) 4(Ph2SiO2)4 ](1) and [(P-Br-C 6H4Sb)4(O)4(Ph2SiO 2)4] (2), respectively. The clusters 1 and 2 were isostructural; the core consists of a distorted Sb4O4 cubane framework with the siloxides acting as bridging ligands across the antimony atoms present at alternate corners of the cube. © 2009 American Chemical Society.