(A) CVs (ν = 10 mV/s) of H83Q/Q107H variants: CuAz (gray), CuAz-[1] (blue), ZnAz (black), and ZnAz-[1] (green), in comparison to free [1] in solution (dotted). (Inset) Baseline-corrected, normalized voltammetric signals of the NiIII/II couple. (B) CVs (ν = 50 mV/s) of Az-[1] constructs as labeled in the figure. (Inset) Molecular structure of [1].