《Highly Active Manganese-Based CO2 Reduction Catalysts with Bulky NHC Ligands: A Mechanistic Study》 was written by Yang, Yong; Zhang, Zhenyu; Chang, Xiaoyong; Zhang, Ya-Qiong; Liao, Rong-Zhen; Duan, Lele. Safety of Bromopentacarbonylmanganese(I) And the article was included in Inorganic Chemistry in 2020. The article conveys some information:
Because of the strong σ-donor and weak π-acceptor of the N-heterocyclic carbene (NHC), Mn-NHC complexes are active for the reduction of CO2 to CO with high activity. However, some NHC-based Mn complexes showed low catalytic activity and required very neg. potentials. The authors report herein that complex fac-[MnI(bis-MesNHC)(CO)3Br] [1; bis-MesNHC = 3,3-bis(2,4,6-trimethylphenyl)-(1,1′-diimidazolin-2,2′-diylidene)methane] could catalyze the electrochem. reduction of CO2 to CO with high activity (TOFmax = 3180 ± 6 s-1) at a less neg. potential. Due to the introduction of the bulky Mes groups, a 1-electron-reduced intermediate {[Mn0(bis-MesNHC)(CO)3]0 (2•)} was isolated as a packed dimer and crystallog. characterized. Stopped-flow FTIR spectroscopy was used to prove the direct reaction between doubly reduced intermediate fac-[Mn(bis-MesNHC)(CO)3]- and CO2; the tetracarbonyl Mn complex [Mn+(bis-MesNHC)(CO)4]+ ([2-CO]+) was captured, and its further reduction proposed as the rate-limiting step. The Mes groups on the NHC ligand improve the catalytic performance of 1 with respect to electrochem. reduction of CO2 to CO. The rate-limiting step probably is the reduction of the tetracarbonyl Mn+ species. In the experimental materials used by the author, we found Bromopentacarbonylmanganese(I)(cas: 14516-54-2Safety of Bromopentacarbonylmanganese(I))
Bromopentacarbonylmanganese(I)(cas: 14516-54-2) has many other uses. It is used in the formation of (eta6-arene)tricarbonylmanganese(I) by reacting with arene (arene= hexamethyl benzene, 1,2,4,5-tetramethyl benzene, mesitylene, p-xylene and toluene) in the presence silver salt.Safety of Bromopentacarbonylmanganese(I)
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary