The HOMO and LUMO energies were estimated from the oxidation and reduction potentials measured using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in dichloromethane at a scan rate of 100 mV s -1 with tetra-n-butylammonium hexafluorophosphate as the supporting electrolyte (Figure ). The values are reported versus a standard calomel electrode (SCE). Two reversible reduction waves were observed for the anthraquinone acceptor- eV, which align with the trend of the DFT predicted HOMO levels of -5.51, -5.15, -5.40 and -5.02, respectively. Consequently, the experimentally observed electrochemical bandgap, ∆E, for T-MeOCz-AQ is 1.91 eV and for C-MeOCz-AQ is 1.89 eV while those of T-tBuCz-AQ and C-tBuCz-AQ are expectedly wider at 2.13 and 2.17 eV, respectively (Table ).