Übergangsmetallkomplexe mit Schwefelliganden, XI* Molybdän-Oxo-Komplexe des Typs [Mo(IV)(O)(S2)2], [Mo(VI)(O)2(S4)], [MO(IV)(O)(S4)] und [Mo(IV)(O)(S5)] mit zwei-, vier- und fünfzähnigen Thioether-thiolat-Liganden (Sx = mehrzähniger Thioether-thiolat-Ligand) / Transition Metal Complexes with Sulfur Ligands, XI* Molybdenum Oxo Complexes of the Type [Mo(IV)(O)(S2)2], [Mo(VI)(O)2(S4)], [MO(IV)(O)(S4)] and [Mo(IV)(O) (S5)] with Bi-, Tetra- and Pentadentate Thioether-Thiolate Ligands (SX = Multidentate Thioether-Thiolate Ligand

MoClReacting [Mo(O)2(acac)2] (acac- = acetylacetonate) with the tetradentate thioether-thiol ligand 2,3,8.9-dibenzo-1,4,7,10-tetrathiadecane (dttd-H2) yields cis-[Mo(O)2(dttd)] ; this compound is reduced by PPh3 to give [MoO(dttd)], which is also obtained from [MoCl2(dttd)] and H2O. Depending upon the concentrations of the reactants [4(THF)2], CH3SC6H4SH and H2O , in THF the products [MoO(CH3SC6H4S)2] or [MoCl2(CH3SC6H4S)2] are formed. In the analogous reaction between [MoCl4(THF)2] and the pentadentate ligand 2,3,11,12-dibenzo- 1,4,7,10,13-pentathiatridecane (dpttd-H2) in THF/H2O. [MoO(dpttd)] is obtained exclusively. Due to their poor solubility, the Mo(IV)-oxo complexes show only limited reactivity only; with NO reductive nitrosylation to cis-Mo(NO)2 complexes is observed.