Effective Pincer Cobalt Precatalysts for Lewis Acid Assisted CO2 Hydrogenation
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- 作者：Ariana Z. Spentzos ; Charles L. Barnes ; Wesley H. Bernskoetter
- 刊名：Inorganic Chemistry
- 出版年：2016
- 出版时间：August 15, 2016
- 年：2016
- 卷：55
- 期：16
- 页码：8225-8233
- 全文大小：487K
- 年卷期：0
- ISSN：1520-510X
文摘
The pincer ligand MeN[CH2CH2(PiPr2)]2 (iPrPNP) was employed to support a series of cobalt(I) complexes, which were crystallographically characterized. A cobalt monochloride species, (iPrPNP)CoCl, served as a precursor for the preparation of several cobalt precatalysts for CO2 hydrogenation, including a cationic dicarbonyl cobalt complex, [(iPrPNP)Co(CO)2]+. When paired with the Lewis acid lithium triflate, [(iPrPNP)Co(CO)2]+ affords turnover numbers near 30 000 (at 1000 psi, 45 °C) for CO2-to-formate hydrogenation, which is a notable increase in activity from previously reported homogeneous cobalt catalysts. Though mechanistic information regarding the function of the precatalysts remains limited, multiple experiments suggest the active species is a molecular, homogeneous [(iPrPNP)Co] complex.