Abstract
The new complexes [Os 11(bpy) 2L](PF 6) [bpy = 2,2′-bipyridine; HL = acetylacetone (Hacac), trifluoroacetylacetone (Htfacac), hexafluoroacetylacetone, dibenzoylmethane or tropolone] have been prepared and the chemical oxidation of the [Os II(bpy) 2L] + species (L = acac or tfacac) by aqueous S 2 O 8 2 - solution in the presence of (NH 4)PF 6 gave the reddish brown complexes [Os III(bpy) 2L](PF 6) 2. These complexes were characterized by spectroscopic measurements and also investigated by cyclic voltammetry. The X-ray crystal structure of [Os(bpy) 2(acac)](PF 6) ( 1) has been determined and showed that the complex has a distorted octahedral geometry in an environment of N 4O 2 donors. The reactivity toward oxidation of benzyl alcohol by complex ( 1) using H 2O 2 or other co-oxidants has been studied and compared with that of the related ruthenium(II) complexes.
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