Dual Electronic Effects Achieving a High-performance Ni(II) Pincer Catalyst for CO Photoreduction in a Noble-metal-free System

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2022 Aug 23

PMID 35998222

Authors

Hai-Hua Huang

Ji-Hong Zhang

Miao Dai

Lianglin Liu

Zongren Ye

Jiahao Liu

Di-Chang Zhong

Jia-Wei Wang

Cunyuan Zhao

Zhuofeng Ke

Affiliations

Soon will be listed here.

Abstract

A carbazolide-(NHC) Ni catalyst (1; NHC, -heterocyclic carbene) for selective CO photoreduction was designed herein by a one-stone-two-birds strategy. The extended π-conjugation and the strong σ/π electron-donation characteristics (two birds) of the carbazolide fragment (one stone) lead to significantly enhanced activity for photoreduction of CO to CO. The turnover number (TON) and turnover frequency (TOF) of 1 were ninefold and eightfold higher than those of the reported pyridinol-(NHC) Ni complex at the same catalyst concentration using an identical Ir photosensitizer, respectively, with a selectivity of ∼100%. More importantly, an organic dye was applied to displace the Ir photosensitizer to develop a noble-metal-free photocatalytic system, which maintained excellent performance and obtained an outstanding quantum yield of 11.2%. Detailed investigations combining experimental and computational studies revealed the catalytic mechanism, which highlights the potential of the one-stone-two-birds effect.

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