A structural and functional model of copper(II)-flavonolate ES complex of flavonol 2,4-dioxygenase.

A novel mononuclear copper(II)-flavonolate complex [Cu II L(fla)] (LH: 2-{[bis(pyridine-2-ylmethyl)-amino]methyl}-4-methoxy benzoic acid, flaH: flavonol) was prepared as a structural and functional model of the ES (enzyme-substrate) complex of Cu II -containing flavonol 2,4-dioxygenase. Its structure, properties and reactivity towards molecular dioxygen have been investigated in details. The complex shows the best reactivity in the copper(II)-flavonolate ES model system, may it could be contributed to the approximately monodentate coordination of the substrate flavonolate. [ABSTRACT FROM AUTHOR]