Publication details
Synthesis, crystal structures and catalytic oxidation of aromatic hydrocarbons by oxovanadium(V) complexes of aminebis(phenolate) ligands
| Authors | |
|---|---|
| Year of publication | 2007 |
| Type | Article in Periodical |
| Magazine / Source | Journal of molecular catalysis A:Chemical |
| MU Faculty or unit | |
| Citation | |
| Field | Inorganic chemistry |
| Keywords | Aminebis(phenolate) ligands; Trigonal bipyramidal geometry; Catalytic oxidation; Toluene and xylenes; Hydroxo hydroperoxo intermediate |
| Description | The coordination chemistry of two aminebis(phenolate) ligands (H2L1 and H2L2) around vanadium(V)is described. Vanadium(V) oxo complexes (1, 2 and 3) of all the ligands were obtained readily by the reaction between the ligand precursors and [VO(acac)2]. Single crystal X-ray structure analysis showed that all of the complexes are penta-coordinated with trigonal bipyramidal geometry in NO4 coordination environment. The tripodal nitrogen atom of the respective ligands and monodentate alkoxo group occupy apical positions. These complexes structurally resemble very closely to the active sites of vanadium haloperoxidases (VHPO) and were found to catalyze the oxidation of toluene to benzoic acid and isomers of xylene to the corresponding hydroxy acids with turn over numbers ranging between 134 and 188. Based on mass spectra the mechanism of the catalytic process was proposed to proceed through the formation of hydroxo hydroperoxo intermediate, which is different from halo peroxidase reactions. |
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