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. Author manuscript; available in PMC: 2018 Feb 14.
Published in final edited form as: J Am Chem Soc. 2017 Jan 5;139(2):701–707. doi: 10.1021/jacs.6b09180

Figure 9.

Figure 9

Effect of protonation on cyclic voltammograms of 4(NEt4)2 (left) and 5(NEt4)2 (right); 0.25 M NBu4PF6 at −15°C vs Fc/Fc+ at a scan rate of 400 mV/s. Left: the first reduction of 42− (bottom) is shifted upon addition of 1.0 equiv. of acid (middle); addition of DBU partly restores the initial spectrum (top). Right: the first reduction of 52− (bottom) is shifted upon addition of 0.9 equiv of acid (second from bottom). The initial redox event is still visible in this spectrum since protonation is not complete. The first derivative of this spectrum shows that these two redox events are separated by 240 mV (second from top); addition of DBU does not fully restore the initial voltammogram (top).