Metal-organic frameworks (MOFs) have shown great promise for CO2 capture and storage. However, the operation of chemical redox functions of framework substances and organic CO2 -trapping entities which are spatially linked together to catalyze CO2 conversion has had much less attention. Reported herein is a cobalt-containing zeolitic imidazolate framework (Co-ZIF-9) which serves as a robust MOF cocatalyst to reduce CO2 by cooperating with a ruthenium-based photosensitizer. The catalytic turnover number of Co-ZIF-9 was about 450 within 2.5 hours under mild reaction conditions, while still keeping its original reactivity during prolonged operation.

Metal-organic frameworks (MOFs) have shown great promise for CO 2 capture and storage. However, the operation of chemical redox functions of framework substances and organic CO 2 -trapping entities which are spatially linked together to catalyze CO 2 conversion has had much less attention. Reported herein is a cobalt-containing zeolitic imidazolate framework (Co-ZIF-9) which serves as a robust MOF cocatalyst to reduce CO 2 by cooperating with a ruthenium-based photosensitizer. The catalytic turnover number of Co-ZIF-9 was about 450 within 2.5 hours under mild reaction conditions, while still keeping its original reactivity during prolonged operation.

An artificial photosynthesis system … … is described by X. Wang and co-workers in their Communication on page 1034 ff. The porous characteristics of a metal-organic framework (MOF), for CO 2 capture, were combined with the catalytic functions of imidazolate groups and cobalt to generate a cobalt-containing zeolitic imidazolate framework. By cooperating with a rutheniumbased photosensitizer, this MOF could reduce CO 2 to CO with a catalytic turnover number of about 450 within 2.5 hours under mild reaction conditions.

Ein künstliches Photosynthesesystem wird von X. Wang und Mitarbeitern in der Zuschrift auf vorgestellt. Die Porosität eines zeolithischen Cobaltimidazolat‐Gerüsts ermöglicht das Einfangen von CO2, auf das die Liganden und Metallzentren katalytisch einwirken können. Dieses Metall‐organische Gerüst konnte in Kombination mit einem Ruthenium‐Photosensibilisator CO2 zu CO reduzieren. Unter milden Reaktionsbedingungen wurden binnen 2.5 h Umsatzzahlen von 450 erreicht.