Nickel(II) pincer complexes demonstrate that the remote substituent controls catalytic carbon dioxide reduction

Abstract

Summary

A photochemical reduction of CO₂ to CO was shown using the nickel complexes or as catalysts in combination with the iridium-based photosensitizer Ir(ppy)3 (100843). Turnover numbers (TONs) of 10.6 for CO with the cobalt complex Ni(4O(-)py)-(MeNHC)2Cl (100823) were reached in acetonitrile. The experiments were conducted under visible-light irradiation using BIH and TEA as sacrificial electron donors (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 nickel complexes as catalysts. The catalytic system performs best (referring to the TON of CO production) in acetonitrile with the cobalt catalyst Ni(4O(-)py)-(MeNHC)2Cl (100823).

Catalyst

Ni(4O(-)py)-(MeNHC)2Cl (100823) [Ni(py)-(MeNHC)2(MeCN)][PF6]2 (100827)

Photosensitizer

Ir(ppy)3 (100843)

Investigation

REDIRECT Photocatalytic CO2 reduction under varied conditionsInvestigation-Name: Table 1

Sacrificial Electron Donor

In this study, the experiments were done with the sacrificial electron donors BIH (BIH (100508)) and TEA (TEA (100505)).

Additives

In this study, TfOH (100744) was used as an additive.