V for TPA-tBu-DiKTa, which is similar to that of 3TPA-DiKTa at 0.93 V and is assigned to oxidation of the TPA group. The CVs of both compounds show reversible reduction waves, with reduction potentials (Ered) from the DPV of -1.41 and -1.45 V, respectively, which are close to that of DiKTa at -1.34 V. The corresponding HOMO and LUMO energies of TPPO-tBu-DiKTa and TPA-tBu-DiKTa are calculated to be -6.