We have obtained a series of isomorphous crystals that exhibit various complex morphologies with first-row metal salts, M(NO3)2 with M = Cu 2+ , Ni 2+ , Co 2+ , and Mn 2+ , as well as an organic ligand. The growth of the crystals is controlled by coordination chemistry. During the solvothermal reactions, the rearrangements of the assemblies is probably affected by the different M-N bond strengths. The relative M-N bond strength is expressed by the Irving-Williams series: Mn 2+ < Co 2+ < Ni 2+ < Cu 2+ . Regardless of the metal used, the crystals show a high level of uniformity, in both their dimensions and shapes.