REACTIVITY OF TRIOSMIUM CLUSTERS WITH SUBSTITUTED TRIPHENYLPHOSPHINES- THE CRYSTAL AND MOLECULAR-STRUCTURE OF [HOS3(CO)9(2-PNH)] (2-PNH2 =2-AMINOPHENYLDIPHENYLPHOSPHINE)

The reaction of 2-aminophenyldiphenylphosphine (2-PNH2) with [Os3(CO)1 1(MeCN)] and [Os3(CO)10(MeCN)2] has yielded the compounds [Os3(CO)11(2 -PNH2)] and [HOs3(CO)9(2-PNH)] respectively. The compounds have been c haracterized spectroscopically and the structure of one of them [HOs3( CO)9(2-PNH)] determined by an X-ray diffraction study. The ligand brid ges an edge of the triosmium triangle with the P atom bound to a singl e Os atom in an equatorial site. The amido N forms a bridge between th is Os atom and one of its neighbours in the triangle.