SYNTHESIS OF 2 NOVEL TETRANUCLEAR MOLYBDENUM(V) COMPLEXES - CRYSTAL-STRUCTURE OF ATO-DICHLORODI-MU(3)-OXOTETRAOXOTETRAMOLYBDENUM(V)

In the reaction of MoO2Cl2 and MoO2Br2 with propionic anhydride, new c omplexes of molybdenum(V), Mo4O2Cl2(OCOC2H5)(6) and Mo4O6Br2(OCOC2H5)( 6), respectively, have been prepared. The crystal structure of the for mer was determined from single crystal diffractometer data and refined to the final R value of 0.046. The complex crystallizes in the monocl inic space group P2(1)/n with cell dimensions a = 11.713(2) Angstrom, b = 9.292(3) Angstrom, c = 30.957(6) Angstrom, beta = 96.71(2)(o) D-ca lc = 1.963 g cm(-3), Z = 4. The tetranuclear complex molecule contains four molybdenum atoms bridged through two oxo-oxygen atoms and six bi dentate propionato-ligands. Two of the four molybdenum atoms form a Mo -Mo bond at 2.592(3) Angstrom.