Publication details

Catalytic Oxidation of Aromatic Hydrocarbons by Mono-oxido- alkoxidovanadium(V) Complexes of ONNO Donor Ethylenediamine- bis(phenolate) Ligands

Authors

DEBNATH Mainak DUTTA Arpan BISWAS Surajit DAS Kalyan Kumar LEE Hon Man VÍCHA Jan MAREK Radek MAREK Jaromír ALI Mahammad

Year of publication 2013
Type Article in Periodical
Magazine / Source Polyhedron
MU Faculty or unit

Central European Institute of Technology

Citation
Web DOI: 10.1016/j.poly.2013.07.013
Doi http://dx.doi.org/10.1016/j.poly.2013.07.013
Field Inorganic chemistry
Keywords Ethylenediamine-bis(phenolate); Oxidovanadium(V); Catalytic oxidation; Aromatic hydrocarbons; DFT calculation; Hydroperoxido intermediate
Attached files
Description Two oxidovanadium(V) complexes, [VO(L1)(OMe)] (1) and [VO(L2)(OMe)] (2), with ONNO donor ethylenediamine-bis(phenolate) ligands (H2L1 and H2L2) have been readily synthesized by the reaction between the ligand precursors and VOSO4.5H2O in MeOH, and characterized by physico-chemical techniques and single crystal X-ray diffraction studies. Both complexes 1 and 2 are hexa-coordinated with a pseudo-octahedral geometry in an N2O4 coordination environment and are found to catalyze the oxidation of toluene to benzoic acid and isomers of xylene to the corresponding hydroxy acids, with turnover numbers (TON) over 200, except for o-xylene. On changing the ligand fragments and coordination geometry around the metal centre there is an improvement in the catalytic efficiency, selectivity and also TON of the reaction as compared with the previously reported systems. The reactions were monitored using 51V NMR spectroscopy. Based on mass spectra analysis and 51V NMR studies, the mechanism of the catalytic process has been proposed, employing the formation of oxido-hydroperoxido /hydroxido-peroxido [V(ONNO)(O)(OOH)]<=>[V(OH)(ONNO)(O2)] intermediates.
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