Highly Efficient Light‐Driven CO 2 to CO Reduction by an Appropriately Decorated Iron Porphyrin Molecular Catalyst

Aspasia Stoumpidi (1) , Adelais Trapali (1) , Marie Poisson (2) , Alexandre Barrozo (2) , Sylvain Bertaina (3) , Maylis Orio (2) , Georgios Charalambidis (1) , Athanassios Coutsolelos (1)

1 UOC - University of Crete [Heraklion]
2 ISM2 - Institut des Sciences Moléculaires de Marseille
3 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

The photocatalytic CO 2 reduction into value-added chemicals is regarded as one promising technology to mitigate environmental issues and the energy crisis of the modern world due to the extended CO 2 emissions. Recent advances have shown that iron porphyrins are considered as one of the most efficient molecular catalysts in the activation and reduction of molecules like CO 2. Thus, we have prepared a suitably modified Fe III porphyrin ([Fe III (TF 4 TMAP)](CF 3 SO 3) 5) and studied its catalytic activity in terms of photocatalytic reduction of CO 2. This iron catalyst possesses four fluorine substituents in the ortho and the meta position of each meso-phenyl group of the porphyrin, while trimethyl-ammonium groups were placed in the para position. Photocatalytic studies were performed in the presence of an iridium complex as a chromophore and have shown that [Fe III (TF 4 TMAP)](CF 3 SO 3) 5 can effectively reduce CO 2, achieving excellent turnover numbers (up to 5500 TONs) and high turnover frequencies. The main reduction product of this photocatalytic system was CO, and only a small amount of hydrogen was detected, presenting a maximum selectivity of 86% for CO.

Domaines: Chimie

Aspasia Stoumpidi, Adelais Trapali, Marie Poisson, Alexandre Barrozo, Sylvain Bertaina, et al.. Highly Efficient Light‐Driven CO 2 to CO Reduction by an Appropriately Decorated Iron Porphyrin Molecular Catalyst. ChemCatChem, 2023, ⟨10.1002/cctc.202200856⟩. ⟨hal-03980075⟩