MULTIPLY BRIDGED ORGANODIANTIMONY(V) COMPOUNDS - CRYSTAL-STRUCTURES OF [(SBR2)(2)(MU-O)(2)(MU-O2ASME2)(2)] (R=PH OR P-TOLYL) AND [(SBR3)(2)(MU-O)(MU-O2MR'(2))(2)] (R=PH, M=P, R'=ME R=PH, M=AS, R'=ME OR PH R=P-TOLYL, M=P, R'=ME)

A number of quadruply and triply bridged organodiantimony(v) compounds have been synthesized by reactions of [(SbR2BrO)(2)] (R = Ph or p-tol yl) and [(SbR3X)(2)O] (R = Ph or p-tolyl, X = Br or Cl) with Na(O2AsMe 2), Na(O2AsPh2) or Na(O2AsMe2). The compounds have been characterised by a range of spectroscopic methods and crystal structures are reporte d for two quadruply bridged, [(SbPh2)(2)(mu-O)(2)(mu-O2AsMe2)(2)] and [{Sb(p-MeC6H4)(2)}(2)(mu-O)(2)(mu-O2AsMe2)(2)], and four triply bridge d compounds, [(SbPh3)(2)(mu-O)(mu-O2PMe2)(2)], [(SbPh3)(2)-(mu-O)(mu-O 2AsMe2)(2)], [(SbPh3)(2)(mu-O)(mu-O2AsPh2)(2)] and {[Sb(p-MeC6H4)(3)}( 2)(mu-O)(mu-O2PMe2)(2)]. Related trimethylantimony(v) compounds, i.e. [{SbMe3(O2PMe2)}(2)O] and [{SbMe3(O2AsPh2)}(2)O], which are highly moi sture sensitive, have also been obtained.