Catalytic Hydrogenation of CO2 by Manganese Complexes: Role of π-Acceptor Ligands

被引:42
|
作者
Rawat, Kuber Singh [1 ]
Mahata, Arup [1 ]
Choudhuri, Indrani [1 ]
Pathak, Biswarup [1 ,2 ]
机构
[1] Indian Inst Technol IIT Indore, Discipline Chem, Indore 453552, Madhya Pradesh, India
[2] Indian Inst Technol IIT Indore, Discipline Met Engn & Mat Sci, Indore 453552, Madhya Pradesh, India
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2016年 / 120卷 / 30期
关键词
DENSITY-FUNCTIONAL THERMOCHEMISTRY; CARBON-DIOXIDE HYDROGENATION; LOW-PRESSURE HYDROGENATION; MOLECULAR-ORBITAL METHODS; DEFINED IRON CATALYST; FORMIC-ACID; RUTHENIUM(II)-CATALYZED HYDROGENATION; HETEROLYTIC CLEAVAGE; COMPUTATIONAL DESIGN; MECHANISTIC INSIGHT;
D O I
10.1021/acs.jpcc.6b05065
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We have carried out computational studies on the CO2 hydrogenation reaction catalyzed by three different Mn-based complexes (Mn1, Mn2, and Mn3) to understand the role of sigma-donor (PMe3) and pi-acceptor (CO) character of the ligands. Further, the role of a different set of sigma-donor and pi-acceptor ligands is studied as the studied CO (pi-acceptor and PMe3 (sigma-donor) ligands have the differences not only in electronic properties but also in steric effects. Here, we find that the sigma-donor ligands (PMe3/PH3) favor the hydride transfer, whereas the pi-acceptor ligands (CO/PF3) favor the heterolytic H-2-cleavege. The energy profile diagram shows that the hydride transfer is the rate-determining step when the CO2 hydrogenation reaction is catalyzed by a Mn-complex containing sigma-donor (PMe3/PH3) and pi-acceptor (CO/PF3) ligands.
引用
收藏
页码:16478 / 16488
页数:11
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