Cobalt-Group 13 Complexes Catalyze CO<sub>2</sub> Hydrogenation via a Co(−I)/Co(I) Redox Cycle
作者:Matthew V. Vollmer、Jingyun Ye、John C. Linehan、Brendan J. Graziano、Andrew Preston、Eric S. Wiedner、Connie C. Lu
DOI:10.1021/acscatal.9b03534
日期:2020.2.21
The Co(−I) dihydrogen complexes, [(η2-H2)CoML]−, where ML is the group 13 metalloligand, N(o-(NCH2PiPr2)C6H4)3M, and M is Al, Ga, or In, were previously reported ( J. Am. Chem. Soc. 2017, 139, 6570−6573). In this work, the related Co(−I) end-on dinitrogen adducts, [(N2)CoML]−, were isolated and investigated as precatalysts for CO2 hydrogenation. The Co–Ga catalyst was highly active, achieving 19,200
所述的Co(-I)双氢配合物,[(η 2 -H 2)海洋生物普查] - ,其中ML是组13 metalloligand,N(ø - (NCH 2 P我镨2)C 6 H ^ 4)3 M和M为Al,Ga或In,先前报道的(J.化学会会志。 2017,139,6570-6573)。在这项工作中,分离并研究了相关的Co(-I)末端二氮加合物[(N 2)CoML] -并作为CO 2的预催化剂进行了研究。氢化。Co-Ga催化剂具有很高的活性,在34 atm的1:1 CO 2 / H 2下,在室温下使用Verkade的原氮杂磷烷作为碱,可实现19,200个甲酸的转化,其初始转化频率为27,000 h –1。Co-Al催化剂呈中等活性,而Co-In络合物呈惰性。因此,调节13族离子极大地影响了Co位点的催化活性。为了阐明第13组载体的作用,进行了Co-Ga和Co-Al催化剂的实验和理论机理研究。Co(-I)H