Starting with the singlet state properties, we note that the radiative decay rate constants do not evolve in parallel with the molar extinction coefficients (Figure , Table ); more specifically, the latter evolve linearly with the number of repeating units, as expected. Indeed, if we divide the extinction coefficients presented in Figure by 1.5, 2.5 and 3.5, numbers that represent the amount of "repetition" in the oligomers (where an integer number stands for a full D-A pair while 0.5 represents the remaining part of the molecule, Figure ), a common value of 0.7×10 4 M -1 cm -1 per DA repeat unit is obtained. For molecules behaving as single chromophore species, the radiative decay rate constant is expected to scale with the extinction coefficient. So, the ratio in 𝜺CT values between 5TABN2 and 4TABN2 of 1.67 translates into an expected radiative decay rate in 5TABN2 of 1.67×0.80x10 7 s -1 =1.35×10 7 s -1 , which is exactly the measured value in Table . However, there is no further increase in the radiative decay rate going from 5TABN2 to 6TABN3 showing that, in the emissive state, the wavefunction is confined over on average 2.5