We first ascertained the optoelectronic properties of the DMAC-TRZ derivatives in N,N-dimethylformamide (DMF), a solvent that is frequently used in dehalogenation reactions in the literature; the poor solubility of these DMAC-TRZ derivatives in acetonitrile precluded its use. The UV-Vis absorption spectrum of DMAC-TRZ (Figure ) matches that previously recorded in toluene, displaying a weak band between 350 -450 nm, assigned to the intramolecular CT transition from DMAC to TRZ. Excluding CNPh-DMAC-TRZ, the other four derivatives display a weak low-energy CT absorption band that maintains a similarly low e to DMAC-TRZ (Figure ); however, when changing the DMAC substituent from EWG to EDG, the onset of the CT band progressively red-shifts. All five derivatives have a more redshifted onset relative to DMAC-TRZ indicating that there is increased conjugation within the donor.