Imoto et al. have demonstrated that AIMD simulations can be used to study high-pressure vibrations. In a study on biomolecular solutions, they have studied pressure-enhanced hydrogen bonding and the resulting infrared response, which has important implications for life in the deep sea. Later it was shown that the computationally less demanding EC-RISM QM/MM method leads to results in good agreement with AIMD and experimental results for the same system. The vibrational properties of polymeric systems under pressure have been studied by DFT as well, e.g., in polyethylene and the [Zn(µ-Cl) 2 (3,5-dichloropyridine) 2 ] n coordination polymer. In the latter case, it was found that vibrational modes play a role in structural transitions of the polymer.