mu-Oxo-bis(tetraphenylantimony): Synthesis, structure, and reactions

Heating of a solution of pentaphenylantimony in toluene in atmospheric oxyg en affords mu -oxo-bis(tetraphenylantimony) (I) in a 63% yield. The latter compound can be converted to bis(tetraphenylantimony) carbonate or phthalat e by the action of carbon dioxide or phthalic anhydride, respectively. Acco rding to X-ray diffraction data, the antimony atoms in compound I have a di storted trigonal-bipyramidal coordination (Sb-O 2.0050(4) Angstrom, the SbO Sb angle 151.71(9)degrees). The molecule of bis(tetraphenylantimony) phthal ate is composed of two equal fragments, and its Sb atoms also have trigonal -bipyramidal coordination (Sb-O 2.2421(8) Angstrom; Sb-C 2.176(1), 2.115(1) , 2.130(1), and 2.137(1) Angstrom).