Copper complexes of the non-innocent β-diketiminate ligand containing phenol groups

Abstract

A new type of non-innocent β-diketiminate ligand having redox active phenol groups (LH₃3, fully protonated form) has been developed, and the structure, physical properties and reactivity of the supported copper(II) complex [Cu^II(L³⁻3−)]⁻ (L³⁻3−, fully deprotonated tri-anionic form) as well as the one-electron and two-electron oxidised complexes, [Cu^II(L˙²⁻)] and [Cu^II(L⁻−)]⁺, have been examined in detail. The two-electron oxidised form [Cu^II(L⁻−)]⁺ exhibited hydrogen atom abstraction ability from 1,4-cyclohexadiene (CHD), whereas the one-electron oxidised form [Cu^II(L˙²⁻)] was found to disproportionate into [Cu^II(L³⁻3−)]⁻ and [Cu^II(L⁻−)]⁺ during the course of the reaction with CHD.