New Photosensitizers Based on Heteroleptic CuI Complexes and CO2 Photocatalytic Reduction with [NiII(cyclam)]Cl2. Issue 44 (16th July 2020)

• Record Type: Journal Article
• Authors: Gracia, Lisa‐Lou; Luci, Luisa; Bruschi, Cecilia; Sambri, Letizia; Weis, Patrick; Fuhr, Olaf; Bizzarri, Claudia
• Is Part Of: Chemistry. Volume 26:Issue 44(2020)
• Page Start: 9929
• Page End: 9937
• Publication Date: 2020-07-16
• Subjects: [Ni(cyclam)]2+ -- CuI complexes -- earth-abundant metal -- photocatalytic CO2 reduction -- photosensitizers; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202001279
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Earth‐abundant metal complexes have been attracting increasing attention 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 a bulky diphosphine (DPEPhos=bis[(2‐diphenylphosphino)phenyl] ether) and a diimine chelating ligand based on 1‐benzyl‐4‐(quinol‐2′yl)‐1, 2, 3‐triazole. Their absorption has a relative maximum in the visible‐light region, up to 450 nm. Thus, their use in photocatalytic systems for the reduction of CO2 with blue light in combination with the known catalyst [Ni II (cyclam)]Cl2 was tested. This system produced CO as the main product through visible light ( λ =420 nm) with a TON up to 8 after 4 hours. This value is in line with other photocatalytic systems using the same catalyst. Nevertheless, this system is entirely noble‐metal free. Abstract : New photosensitizers based on earth‐abundant Cu I absorb blue light and undergo reductive quenching with an electron donor (BIH). A second electron transfer to a Nickel catalyst triggers the catalytic reduction of CO2 to CO.