Several cis-dioxomolybdenum complexes of two tridentate ONS chelating ligands H 2 L 1 and H 2 L 2 (obtained by condensation of S-benzyl and S-methyl dithiocarbazates with 2-hydroxyacetophenone) have been prepared and characterized. Complexes 1 and 2 are found to be of the form MoO 2 (CH 3 OH) L 1 Á CH 3 OH and MoO 2 L, respectively, (where L 2-¼ dianion of H 2 L 1 and H 2 L 2 ). The sixth coordination site of the complexes acts as a binding site for various neutral monodentate Lewis bases, B, forming complexes 3-10 of the type MoO 2 LB (where B ¼ -picoline, imidazole, thiophene, THF). The complexes were characterized by elemental analyses, various spectroscopic techniques, (UV-Vis, IR and 1 H NMR), measurement of magnetic susceptibility at room temperature, molar conductivity in solution and by cyclic voltammetry. Two of the complexes MoO 2 (CH 3 OH) L 1 Á CH 3 OH (1) and MoO 2 L 1 (imz) (5) were structurally characterized by single crystal X-ray diffraction. Oxo abstruction reactions of 1 and 5 led to formation of oxomolybdenum(IV) complex of the MoOL type.
A number of dioxo-bridged binuclear molybdenum(VI) complexes with diprotic tridentate ONS donor Schiff bases (H 2 L 1 , H 2 L 2 , H 2 L 3 , and H 2 L 4 ) obtained by the condensation of salicylaldehyde/2-hydroxyacetophenone with S-benzyl and S-methyl dithiocarbazates have been synthesized using the Mo(V) complex (NH 4 ) 2 [Mo V OCl 5 ] as starting material. All these reactions are carried out in air and the Mo V O center of the precursor complex undergoes spontaneous aerial oxidation leading to the formation and isolation of molybdenum(VI) complexes Mo 2 O 4 L 2 . The complexes were characterized by elemental analyses, various spectroscopic techniques (UV-Vis, infrared etc.), magnetic susceptibility at room temperature, molar conductivity, and cyclic voltammetry. One of the complexes, Mo 2 O 4 L 2 1 (1), was structurally characterized by single-crystal X-ray crystallography.
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