Voltammograms are referenced versus Fc/Fc + and the data are reported versus a saturated calomel electrode (SCE) and collated in Table . As shown in Figure , all three compounds show reversible oxidation and reduction processes. The Ered, determined from the DPV peak values, are -1.39 (TPAPyAP), -1.21 V (TPAPyBP) and -1.09 V (TPAPyBPN), respectively, reflecting the expected anodic shift that is mirrored in the trend of calculated stabilized LUMO levels (Figure ) due to the increasing p-accepting ability of the acceptor units from AP < BP < BPN. The corresponding LUMO levels are -2.95 eV, -3.13 eV and -3.