Abstract
The ionic liquid, IL, dependence of the mid-point potential of the ferrocene|ferrocenium, Fc0/+, couple versus the decamethylferrocene|decamethylferrocenium, DmFc0/+, couple was studied in eleven ILs and in dichloromethane with added IL as the supporting electrolyte. The difference in mid-point potential between Fc and DmFc indicates that Fc0/+ couple is clearly dependent on the IL structure. A variation of about 0.100V over the range of ILs studied under neat conditions and by ca. 0.050V when studied in dichloromethane is reported. Meanwhile, a variable potential shift ranging from 0.014 to 0.082V was observed when data was compared in these two systems (ILs vs. dichloromethane). The effect of water and lithium ion on the Fc0/+ and DmFc0/+ redox potential was also evaluated and found to be minimal.
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