So far, we presented only vibrational spectra of the pristine COF-1 material. We made a dedicated effort to dry the sample to enable a comparison between theoretical predictions and experimental results. If such an effort is not made, the samples are not completely dry and include residual solvent, in our case 1,4-dioxane and mesitylene, trapped inside the pores. In the following, we discuss the effect of the solvent residues, or guest molecules, on IR and Raman spectra, using the computational approach and settings we determined as optimal in Sections 6.2 and 6.3 (Berry phase dipole moments and DFPT polarizabilities).