3.1.2. PXRD Analysis

The ARI multicomponent crystals were synthesized and characterized by PXRD. As seen in Figure 4, their experimental patterns show significant differences compared with those of ARI, which are confirmed as new crystalline forms due to the absence of the characteristic peak of ARI at 20.483◦ and 22.199◦. The characteristic PXRD peaks of the ARI-SAL salt were 12.948◦, 18.401◦, and 19.849◦, while those of the ARI-ADI salt were 25.079◦, 14.976◦, and 18.256◦, which were different from those of its acetone hemisolvte with characteristic PXRD peaks at 18.197◦ and 24.897◦. Importantly, the experimental patterns of ARI-ADI salt acetone hemisolvate and ARI-SAL salt coincided well with their own calculated PXRD patterns from single crystal structures, indicating that the bulk pure samples were prepared successfully.

**Figure 4.** PXRD patterns of ARI and its crystal salts.
