We report here the first purely organometallic fac-[MnI (CO)3 (bis-Me NHC)Br] complex with unprecedented activity for the selective electrocatalytic reduction of CO2 to CO, exceeding 100 turnovers with excellent faradaic yields (ηCO ≈95 %) in anhydrous CH3 CN. Under the same conditions, a maximum turnover frequency (TOFmax ) of 2100 s-1 was measured by cyclic voltammetry, which clearly exceeds the values reported for other manganese-based catalysts. Moreover, the addition of water leads to the highest TOFmax value (ca. 320 000 s-1 ) ever reported for a manganese-based catalyst. A MnI tetracarbonyl intermediate was detected under catalytic conditions for the first time.

中文翻译：

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一种高活性 N-杂环卡宾锰 (I) 络合物，用于选择性电催化 CO2 还原为 CO。

我们在这里报告了第一个纯有机金属 fac-[MnI (CO)3 (bis-Me NHC)Br] 配合物，具有前所未有的选择性电催化还原 CO2 为 CO 的活性，超过 100 次转换，具有出色的法拉第产率 (ηCO ≈95 %)溶于无水 CH3 CN。在相同条件下，通过循环伏安法测得的最大周转频率（TOFmax）为2100 s-1，这明显超过了其他锰基催化剂报道的值。此外，添加水导致锰基催化剂达到有史以来报道的最高 TOFmax 值（约 320 000 s-1）。首次在催化条件下检测到MnI四羰基中间体。