Synthesis, Characterization and Some Properties of Oxoperoxo Complexes of Molybdenum with 2-Hydroxy-1-naphthaldehyde Isonicotinoylhydrazone

Abstract

Abstract The peroxo complexes [MoO(O2) (ihnpy)].2H2O(1) (H2ihnpy=2-hydroxy-1-naphthaldehyde isonicotinoylhydrazone), K[MoO(O2)2 (Hihnpy)](2), K(Mo2O2(O2)4 (Hihnpy) (H2O)2](3), the oxo complexes [MoO2 (ihnpyH)-(HSO4)](4) and [MoO2 (ihnpy)].2H2O(5) have been prepared and characterized by elemental analyses, molar conductance, IR and IH NMR spectroscopic studies. On the basis of the spectroscopic evidence, H2 ihnpy coordinates to the molybdenum centre in the enol form in a bridging fashion in complexes (1) and (5) through the phenolic oxygen, enolic oxygen, azomethine nitrogen and pyridyl nitrogen atoms. In the complexes (2) and (3), H2 ihnpy coordinates to the molybdenum centre in the keto form as a monobasic bidentate ligand through the phenolic oxygen and azomethine nitrogen atoms. Peroxide is coordinated to the metal centre in a bidentate chelating fashion in the complexes (1), (2) and (3). The molecular oxoperoxo complex (1) on reaction with SO2 yielded the complex [MoO2. (ihnpyH) (HSO4)] (4) in which t...