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Synthesis, crystal structures, and catalytic oxidation properties of oxidovanadium(V) complexes with Schiff base ligands

Research paper by Kui-Hua Yang

Indexed on: 02 Apr '14Published on: 02 Apr '14Published in: Transition Metal Chemistry



Abstract

Two new Schiff base ligands 2-chloro-N′-(5-fluoro-2-hydroxybenzylidene)benzohydrazide (H2La) and 4-fluoro-2-{[2-(2-hydroxyethylamino)ethylimino]methyl}phenol (HLb) were synthesized and characterized. Their respective oxidovanadium complexes, [VOLa(OMe)(MeOH)]·MeOH (1) and [VO(μ-O)Lb]2 (2), were synthesized and characterized by spectroscopy and single-crystal X-ray diffraction. The coordination sphere of each V atom is octahedral. Both complexes showed selective heterogeneous catalytic properties with 74–98 % conversion, for the oxidation of cyclohexene, cyclopentene, and benzyl alcohol using H2O2 as primary oxidant.