Photocatalytic CO2 Reduction Mediated by Electron Transfer via the Excited Triplet State of Zn(II) Porphyrin

Abstract

Summary

A photochemical reduction of CO₂ to CO was shown using the zinc porphyrin dyad with a connected rhenium complex (Zn(tBuPP))-(Re(Phen)Br(CO)3) (100954) as a combined catalyst and photosensitizer molecule. Turnover numbers (TONs) of >1300 and a selectivity of >99.9% for CO were reached in DMA. The experiments were conducted under visible-light irradiation (λ = 420 nm) using BIH as sacrificial electron donor (see section SEDs below).

Advances and special progress

A selective method for the reduction of CO₂ to CO with a porphyrin-rhenium complex dyad was presented, effectively linking the catalyst and photosensitizer in one molecule.

Content of the published article in detail

The article contains results for the reduction of CO₂ to CO under visible-light catalysis using (Zn(tBuPP))-(Re(Phen)Br(CO)3) (100954) as a catalyst and photosensitizer. The catalytic system performs best (referring to the TON of CO production) in DMA.

Catalyst and Photosensitizer

(Zn(tBuPP))-(Re(Phen)Br(CO)3) (100954)

Sacrificial electron donor

In this study, the experiments were done with the sacrificial electron donor BIH BIH (100508).

Additives

In this study, phenol was used as an additive.