Results and discussion To modify the electronic features of the C2-H2 of imidazolium cation carbon, we synthesized four cations: 1,3-dimethyl-4,5-dichloro imidazolium (DiCl), 1,3,4,5-tetramethyl imidazolium (TetraMe), 1,3-dimethyl-4,5-diphenyl imidazolium (DiPh) and 1,3-dimethyl-4,5-di(4methoxy) diphenyl (DiMeOPh). The structure of the cations is shown in Figure 4.2. The activity of these cations will be compared to that of MM cation as our benchmark co-catalyst. Figure 4.3 summarizes the 13C NMR results for all cations studied in this chapter, aiming at providing insights into the charge density of C2-proton for cations of the same functional family. For a detailed discussion on acidity trends among these cations, please refer to Supporting Information Section VI. Figure 4.2. Imidazolium cations synthesized in this work for investigating electrochemical reduction of CO2 in anhydrous acetonitrile. MM TetraMe DiPh DiCl DiMeOP
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