The measurement at temperatures below room temperature confirmed the presence of sharp vibrational features that underly each of the features observed at room temperature. Given that the subsequent crystallisation experiments were performed in the temperature range of 4 °C to 25 °C, and that the presence of the liquid flow cell limits the spectral bandwidth of the spectrometer to the range of 0.35 THz to 2 THz, the more intense feature at 1.6 THz at 21 °C was used to represent the behaviour of the crystalline phase (Figure ).