Metal-free reduction of CO2 to formate using a photochemical organohydride-catalyst recycling strategy

Abstract

Summary

A photochemical reduction of CO₂ to CO was shown using the iron complexes (100947), (100948) and (100949) as catalysts in combination with the organic photosensitizer 4CzIPN (100938). Turnover numbers (TONs) of 6320 and a selectivity of 99.4% for CO were reached in DMF/H₂O with catalyst (100949). The experiments were conducted under visible-light irradiation (λ = 440 nm) using TEA as sacrificial electron donor (see section SEDs below).

Content of the published article in detail

The article contains results for the reduction of CO₂ to CO under visible-light catalysis using the iron complex (100949) as a catalyst. The catalytic system performs best (referring to the TON of CO production) in DMF/H₂O.

Photosensitizer

3,6-bis(dimethylamino)-9-phenyl-9H-carbazole (100950)

Sacrificial electron donor

In this study, the experiments were done with the sacrificial electron donor ascorbic acid L-ascorbate, sodium (100861). The use of BIH was tested, but found to yield worse results.

Additives

In this study,