*2.4. Energetic Characterization by Cyclic Voltammetry*

Cyclic voltammetry (CV) measurements of our double aza-oxa[7]helicene **3** showed reversible redox peaks in both negative and positive regions indicating the chemical stability of its anion/cation pairs and how they can be reduced or oxidized readily to the neutral form (Figure 5). Using ferrocene and ferrocenium as internal references, the HOMO energy level of **3** was calculated using Bredas empirical equation to be around (–7.83 eV) which is comparable to the DFT-calculated HOMO energy (−7.90 eV) [61]. *E*LUMO could be estimated after considering the gap between *E*HOMO and *E*LUMO (3.04 eV) from the λmax or excitation energy (407 nm) to be around (−4.79 eV) showing little higher energy than the DFT-calculated LUMO (−5.72 eV).

**Figure 5.** The cyclic voltammetry profile of **3** in (MeCN) with *n*-Bu4NPF6 (0.1 M) using ferrocene as internal reference.
