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Synthesis and application of molybdenum based catalyst for oxidation reactions

Synthesis of the dioxomolybdenum(VI) was carried out by using [MoO2(acac)2] and the corresponding ONO hydrazone ligand (2, 3- dihydroxbenzaldehyde isonicotinoylhydrazone, H2L1 or 2, 3-dihydroxbenzaldehyde nicotinoylhydrazone, H2L2). Polynuclear complexes, [MoO2(L1)]n∙MeCN and [MoO2(L2)]n were obtained from acetonitrile, whereas mononuclear complexes [MoO2(L1, 2)(MeOH)] were isolated from methanolic solution. The mechanochemical synthesis employing liquid assisted grinding was also applied, and H2L1 ligand and mononuclear complexes were obtained in such a way. Ex-situ powder X-ray diffraction method was implemented for monitoring H2L1 ligand obtained by mechanochemical synthesis. Complexes were characterized by IR spectroscopy, elemental and termogravimetric analysis. Additionally, polynuclear complexes were characterized by NMR spectroscopy. Molecular and crystal structures of H2L1 ligand and its mononuclear complex were determined by the single crystal X-ray diffraction. Lastly, the complexes were tested as catalyst in oxidation reactions of secondary alcohols, carveol and cyclohexanol by using H2O2 and TBHP (in aqueos solution or solution in decane).

catalysis, hydrazones, molybdenum(VI) complexes, oxidation of secondary alchohols

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