Earth-abundant metal complexes have been attracting increasinga ttention in the field of photo(redox)catalysis. In this work, the synthesis and full characterisation of four new heteroleptic Cu I complexes are reported, which can work as photosensitizers. The complexes bear ab ulky diphosphine (DPEPhos = bis[(2-diphenylphosphino)phenyl] ether) and ad iimine chelating ligand based on 1-benzyl-4-(quinol-2'yl)-1,2,3-triazole. Their absorption has ar elative maximum in the visible-light region, up to 450 nm. Thus, their use in photocatalytic systemsf or the reduction of CO 2 with blue light in combination with the known catalyst [Ni II (cyclam)]Cl 2 was tested.T his system produced CO as the main product through visible light (l = 420 nm) with aT ON up to 8a fter 4hours. This value is in line with other photocatalytic systemsu sing the same catalyst. Nevertheless, this system is entirely noble-metal free.
A fully earth‐abundant system for the photocatalytic reduction of CO2 is described. The combination of new heteroleptic CuI complexes as photosensitizers with a known Ni catalyst showed the selective formation of CO, with comparable yields to some noble‐metal systems. Chemistry enables the cooperation with Sun, providing clean energy, and Earth offering abundant Cu and Ni, for the transformation of the greenhouse gas CO2 into value‐added chemicals. The new CuI photosensitizers show new perspectives for the development of more efficient and sustainable systems. More information can be found in the Full Paper by C. Bizzarri et al. on page 9929.
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