O2-Binding abilities and catalytic oxidation performance of cobalt (II) complexes with dihydroxamic acid functionalized N-pivot lariat ethers

The oxygenation constants (inko2) and thermodynamic parameter (δho,δso) of novel co (ii) complexes with dihydroxamic acids functionalized n-pivot lariat ether col1∼col4 and the uncrowned analogue col5 were measured. their catalytic performance in oxidation of p-xylene to p-toluic acid (pta) was investigated. the enhancement of o2-binding and catalytic oxidation activities by the oxa aza crown ether ring of the cobalt complexes as well as the complexed alkali metal and alkaline-earth metal ions were discussed.