The oxygenation of cobalt (II) hydroxamates (CoL2) and its catalytic performance in oxidation of p-xylene to p-toluic acid (PTA) were examined. The effects of X and Y bonded to hydroxamate group on dioxygen affinities and catalytic oxidation performance were also investigated.
Chun Chun ZHANGWei ZENGJian Zhang LISheng Ying QIN
A new series of bis-hydroxamic acids ligands (H2L1～ H2 L5) with alkyl ether as bridge group and their cobalt complexes were synthesized.All the new c ompounds were characterized by elemental analysis,IR, 1 HNMR and MS. The diox ygen affinities of their cobalt complexes were investigated at the same time.
The oxygenation constants and thermodynamic parameter (?Ho, ?So) of a series of novel Co (II) complexes with phenol ether bridged dihydroxamic acids CoL1-CoL6 were measured, their catalytic performance in oxidation of p-xylene to p-toluic acid (PTA) were examined. The modulation of O2-binding capabilities and catalytic oxidation activities by X (X = Cl, OCH3) and Y (Y = H, CH3, Cl) groups bonded to the aromatic rings of the Co (II) complexes were investigated.
