ELECTROOXIDATION OF THE REDOX TERTIARY PHOSPHINE HENYLPHOSPHINO)4',5,5'-TRIMETHYLTETRATHIAFULVALENE (P1) AND THE STRUCTURE OF (P1O.-)()(2)MO(6)BR(14)(2)

Electrooxidation of the imethyl-1,1',3,3'-tetrathia-4-fulvalenyl)phosp hine (hereafter P-1) in the presence of ((n)Bu(4)N(+))(2)Mo6Br142- aff ords the cation radical salt yl-1,1',3,3'-tetrathia-4-fulvalenyl)]phos phoniumyl oxide-hexamolybdenum tetradecabromide (2/1), (P1O+.)(2)Mo6Br 142-, where P1O is ',4,4'-trimethyl-1,1',3,3'-tetrathia-4-fulvalenyl) oxide. The P1O+. cation radicals are located in general positions and the Mo6Br142- anions are located on inversion centres. The intramolecu lar bond distances and angles are as expected for monooxidized tetrath iafulvalenes. The P-atom environment is approximately tetrahedral with O-P-C angles of 113.3 (5), 113.6 (5) and 113.9 (5)degrees. The molybd enum halide cluster core symmetry is O-h, within the estimated standar d deviations.