Electrochemical CO2 Reduction Catalyzed by Binuclear LRe2(CO)6Cl2 and LMn2(CO)6Br2 Complexes with an Internal Proton Source.
Electrochemical CO2 Reduction Catalyzed by Binuclear LRe2(CO)6Cl2 and LMn2(CO)6Br2 Complexes with an Internal Proton Source.
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双核 LRe2(CO)6Cl2 和 LMn2(CO)6Br2 配合物与内部质子源催化电化学 CO2 还原
DOI:
10.1021/acs.accounts.1c00609
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发表时间:
2022
影响因子:
18.3
通讯作者:
I. Siewert
中科院分区:
文献类型:
--
作者:
I. Siewert
ConspectusThe synthesis of certain commodity chemicals, e.g., methanol and acetic acid, relies on CO, which is currently mainly produced by the combustion of carbon or natural gas. Photo- or electrochemical conversion of atmospheric CO2to CO represents an attractive alternative strategy as this approach is carbon-neutral. Such photo- or electrochemically formed CO can also be used in the Fischer–Tropsch process forming liquid hydrocarbons for energy storage applications. The multiple electroreduction of CO2is preferably coupled with proton transfer steps as this requires less energy than the single outer-sphere 1e–reduction of CO2.In 1984 and 2011, it was shown that [(Lbpy)Re(CO)3Cl] (1) and [(Lbpy)Mn(CO)3Br] (2), respectively, mediate the electrochemical 2e–/2H+reduction of CO2forming CO and water (Lbpy= 2,2′-bipyridine). Since proton management is crucial for catalysis, recently the impact of internal proton sources close to the axial position in such complexes has been investigated. However, binuclear complexes have been used rarely as mediators although it has been shown very early for1that electron management is also important: the 2e–/2H+reduction pathway with1exhibits a higher reaction rate than going via the singly reduced species, though the pathway requires a higher overpotential. In this Account, we focus on recent developments of binuclear LMn2(CO)6and LRe2(CO)6mediators with an internal phenol group in the electroreduction of CO2. In contrast to mononuclear derivatives, for which the impact of the internal proton source on catalysis is very diverse, we always observed a higher reaction rate and for the Mn complexes also a lower overpotential with the binuclear complexes compared to the mononuclear variants. Spectroscopic, electrochemical, and computational studies on the mono- and binuclear complexes shed light on their reactivity under reductive conditions, elucidated the structure of reduced species, unraveled the kinetics for catalytically productive and unproductive (side) reactions, and allowed us to derive some hypothesis on the CO2reduction mechanism. Finally, I emphasize that the electrohydrogenation of the polar double bonds by the binuclear complex LMn2(CO)6with a central phenol unit is not restricted to CO2but is also applicable to organic compounds with C═O bonds.
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影响因子:
2.8
作者:
L. A. Paul;Nico C. Röttcher;J. Zimara;Jan;Jianfeng Du;D. Schwarzer;R. Mata;Inke Siewert
通讯作者:
Inke Siewert
DOI:
10.1002/chem.202002075
发表时间:
2020-11-06
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
作者:
Fokin I;Siewert I
通讯作者:
Siewert I
影响因子:
4.3
作者:
Du, Jia-Pei;Wilting, Alexander;Siewert, Inke
通讯作者:
Siewert, Inke
DOI:
--
发表时间:
2021
期刊:
Synthesis
影响因子:
--
作者:
Igor Fokin;Kai;Inke Siewert
通讯作者:
Inke Siewert
影响因子:
15
作者:
S.-A. Hua;L. Paul;M. Oelschlegel;S. Dechert;F. Meyer;I. Siewert
通讯作者:
I. Siewert