期刊
INORGANIC CHEMISTRY
卷 60, 期 11, 页码 7708-7718出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c00003
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资金
- Institute for Basic Science in Korea [IBS-R10-A1]
- ASU Light-Works through the Sustainable Fuels and Products Fossil Free Future initiative
- Higher Education Commission of Pakistan through the International Research Support Initiative Program (IRSIP)
This study investigated the synthesis of transition metal complexes through a series of reactions in the presence of a specific ligand, revealing the potential for CO2 coupling and other chemical transformations. Computational studies were also conducted to understand the reaction mechanisms and the importance of cis-coordination sites in selective carbon dioxide coupling reactions.
Refluxing Mo(CO)(6) in the presence of the phosphine-functionalized alpha-diimine ligand (DI)-D-Ph2PPr allowed for substitution and formation of the dicarbonyl complex, ((DI)-D-Ph2PPr)-Mo(CO)(2). Oxidation with I-2 followed by heating resulted in further CO dissociation and isolation of the corresponding diiodide complex, ((DI)-D-Ph2PPr)MoI2. Reduction of this complex under a N-2 atmosphere afforded the corresponding bis(dinitrogen) complex, ((DI)-D-Ph2PPr)Mo(N-2)(2). The solid-state structures of all three compounds were found to feature a tetradentate chelate and cis-monodentate ligands. Notably, the addition of CO2 to ((DI)-D-Ph2PPr)-MO(N-2)(2) is proposed to result in head-to-tail CO2 coupling to generate the corresponding metallacycle and ultimately a mixture of ((DI)-D-Ph2PPr)Mo(CO)(2) and the bis(oxo) dimer, [(kappa(3)-(DI)-D-Ph2PPr)Mo(O)(mu-O)](2). Computational studies have been performed to gain insight into the reaction and evaluate the importance of cis-coordination sites for selective head-to-tail CO2 reductive coupling, CO deinsertion, disproportionation, and stepwise CO2 deinsertion.
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