【摘 要】
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Electronic tuning by para substitutions was explored to achieve a highly active manganese N-heterocyclic carbene pincer complex for the selective electrocatalytic reduction of CO2 to CO.[MnCNCOMe]BF4 (I2-Mn) bearing an electron-donating group (-OMe) showe
【机 构】
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School of Materials Science & Engineering,School of Chemistry,PCFM Lab,Sun Yat-sen University,Guangz
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Electronic tuning by para substitutions was explored to achieve a highly active manganese N-heterocyclic carbene pincer complex for the selective electrocatalytic reduction of CO2 to CO.[MnCNCOMe]BF4 (I2-Mn) bearing an electron-donating group (-OMe) showed high activity with 63 × catalytic current en-hancement,average Faradaic efficiency of 104％,and a TOFmax value of 26,127 s-1,which is 127 times higher than that of unsubstituted[MnCNCH]Br (L1-Mn) reported previously.In contrast,the electron-withdrawing group (-COOMe) in[MnCNCCOOMe]pF6 (L3-Mn) inhibited the electrocatalytic activity.Am-bient Brφnstic acid,however,suppressed the activity of L2-Mn probably due to the protonation of the-OMe group.These findings indicate a potential electronic tuning strategy to improved manganese N-heterocyclic carbene catalysts for CO2 reduction.
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