The powder X-ray diffraction (PXRD) measurements confirm that the crystals are isostructural, regardless of the metal cations (Cu 2+ , Ni 2+ , Co 2+ , and Mn 2+ ; Figure ). Fitting the experimental PXRD data with the simulated SCXRD of Cu-AdDB indicated that all crystals have the same hexagonal space group (P622) and nearly identical unit cell parameters. This observation indicates that the use of different cations does not affect the overall crystallographic structure-it primarily affects the crystals' external appearance and dimensions. The X-ray analyses of the aforementioned crystals reveal that the structures have a metal-to-ligand ratio of 1:1, although two equivalents of the ligand, AdDB, were used in the crystallization reaction.