Molecular Oxygen Activation by Redox-Switchable Anthraquinone-Based Metal-Organic Frameworks

A dipyridyl-substituted anthraquinone (2,6-di-(pyridin-4-yl)-9,10-anthraquinone, DPAq) was incorporated as a redox-active linker molecule into crystalline coordination networks. The oxidation state of the organic linker can be selectively controlled prior to framework formation and furthermore be maintained in the solid state. Hydrogen bonding is identified to be a substantial stabilization factor. Additionally, it is shown that the anthraquinone-anthrahydroquinone redox pair can be switched reversibly even after incorporation in the solid state by a thermal treatment/soaking procedure-going along with the formation of hydrogen peroxide from molecular oxygen (air) during the oxidation process.

Automated summary

In this study, a dipyridyl-substituted anthraquinone was incorporated into crystalline coordination networks, with the oxidation state of the organic linker selectively controlled and maintained in the solid state through hydrogen bonding. The anthraquinone-anthrahydroquinone redox pair was shown to be reversibly switched even after incorporation in the solid state, with the formation of hydrogen peroxide from molecular oxygen during the oxidation process.