*3.5. Morphological Analysis*

The morphological analysis revealed that the ITR powder "as received" was composed of large rod-like structures, with particles up to 30 μm (Figure 9a). An SE micrograph of particles of ITR–TER cocrystal produced by ball milling showed that this sample was composed of clusters of round particles smaller than 1 μm (Figure 9b), while the cocrystals prepared by slow solvent evaporation from methanol showed larger rod-like structures of approximately 450 μm (Figure 9c). The Bravais, Friedel, Donnay and Harker (BFDH) predicted morphology of the particle, based on the single crystal structure of ITR–TER cocrystal, showed some similarity between the experimental (Figure 9c) and simulated crystal shapes, however the (001) and (00–1) faces are clearly dominant in the former due to the solvent's impact on the crystal growth (Figure 9d).

**Figure 9.** Scanning electron micrographs of: (**a**) crystalline ITR and the ITR–TER cocrystal produced by (**b**) ball milling, (**c**) slow solvent evaporation from methanol, as well as the (**d**) Bravais, Friedel, Donnay and Harker (BFDH) predicted morphology based on the single crystal structure of the ITR–TER cocrystal.
