Crystal packing driven by metal–ligand interactions, hydrogen bonds, π–π stacking and anion–π stacking

Two polymeric copper(II) compounds have been synthesized with the ligand bis(pyrimidin-2yl)amine (dipm), by means of coordination bonds, Watson–Crick type hydrogen bond interactions and π–π stacking. Both supramolecules hold the same cationic building block, namely [Cu(dipm)2(H2O)2]2+. However, their crystal structure significantly differs and this variation apparently arises from the nature of the anion which induces dissimilar crystal packings. The crystal growth is driven by several synergistic intermolecular interactions, i.e., coordination and hydrogen bonds, π–π and anion–π stacks.