Next, we turn our attention to the vibrational modes of the complex with double doping. In particular, the IR absorption spectrum of the complex is calculated and com- pared with the spectra of the individual oligomer cation and the CN6-CP di-anion as shown in Figure . While not being identical because of the system complexity, the vibrational spectral features of the CN6-CP di-anion can also clearly be identified in the spectrum of the complex. The same is true for the oligomer cation. However, in that case besides a generally strong resemblance a one to one correspondance with the IR spectrum of the complex is not found due to the large number of vibrational modes contributing to the spectrum. Nevertheless, in particular the spectrally dominant mode in the oligomer cation at 1319 cm -1 can also be identified in the complex. The corresponding modes are slightly red-shifted (at 1334 and 1352 cm -1 ) in the complex and appear twice due to the two oligomers contributing. These two peaks in the Complex IR spectrum can be identified as the typical intense vibrational modes (IVMs) observed in the presence of polarons. To illustrate this aspect further, we also study the polaron movement when the molecular geometry is displaced along thoses vibrational normal modes associated with the IVMs. For each displacement, we then perform single point calculations of the new geometries using the wavefunction of the optimized geometry as an initial guess. Results are summarized in Figure . Note that due to the charge transfer present in the complex, the static electric dipole moment is non-zero in the relaxed state. The change of the dipole moments caused by the displacement along both IVMs is shown in Figure ). For both IVMs, we see that the dipole moment changes mainly in one direction, which corresponds to the movement of the polaron along the backbone of each oligomer, while the change in the other directions is only minor. The molecular orbitals of the polarons for the two largest displacements of both IVMs and the relaxed geometries are also shown in Figure ). For each IVM we see that only one polaron is displaced upon displacement such that it oscillates around its relaxed position, whereas the other polaron is not much affected. Therefore, each of the two IVMs corresponds to the oscillation of one of the polarons, respectively. This confirms that the two large peaks in the vibrational spectrum of the complex are related to the two positive charges induced on the conjugated oligomers in the complex.