Alkyloxy-Directed ligand Tethering: An efficient strategy for Mn(I) complex-based CO<sub>2</sub> reduction catalysis
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Increasing catalyst performance and controlling product selectivity in organometallic catalysts for CO2 reduction are major challenges. When pendant Brønsted acid/Lewis bases are combined with secondary coordination sphere, the proton of the tethering ligand can directly supply the proton to the metal, and the metal hydride intermediate can be stabilized by hydrogen bonding between the tether ligand and the metal hydride to increase catalyst efficiency. On the other hand, the number of tethering ligands directly related to the efficiency of CO2-to-formate conversion: as the number of tethering ligands increased, the structure of the catalyst was bulky, further preventing Mn-Mn dimerization and increasing the product selectivity toward CO2-to-formate.