Turning now to Raman and comparing the measured spectrum of the dry and wet sample, we observe additional peaks at ≈ 500-600 cm -1 and ≈ 2850-3050 cm -1 , highlighted in red and blue in Figure , respectively, for the wet sample. Apart from these, the Raman spectrum remains unchanged. The AIMD-based spectrum of COF-1+solvent does not show additional signals at ≈ 500-600 cm -1 in Figure , indicating that these peaks might stem from the remaining mesitylene or the precursor. However, the peaks at ≈ 2850-3050 are reproduced. In agreement with the experimental findings, the solvent has no further impact on the spectrum, except that the peaks involving collective vibrations, such as the one at 1600 cm -1 , appear narrower in the spectra containing solvent. This observation aligns with the findings for IR. The explanation is the same.