3.4.1. PXRD

The PXRD pattern recorded for commercially available DPA, DPA crystals, DPA\_PA salt and PA. The PXRD pattern of the commercially available DPA and DPA crystal is

matched to reveal that both are in the same crystalline phase. Further PXRD patterns of the salt are different from individual components, suggesting formation of a new crystalline phase in the solid-state. (Figure S1). Furthermore, the overlapping of the experimental PXRD pattern of these crystals matched well the simulated PXRD pattern obtained from the single-crystal X-ray data, confirming the homogeneity of the sample.
