A special case of copper(II) complex having monodentate and uncoordinated 4-aminopyridine molecules stabilized by highly cooperative supramolecular interactions

A novel mononuclear copper(II) complex, having three monodentate and one uncoordinated 4-ampy molecules and formulated as [Cu(bpy)(4-ampy)3]2·(ClO4)4(4-ampy)2(H2O) (1) (bpy = 2,2′-bipyridine, 4-ampy = 4-aminopyridine), is extended into a one-dimensional (1D) supramolecular chain, where highly self-complementary sandwiched π–π stacking between two bpy ligands and one uncoordinated 4-ampy molecule in the middle and 8-membered N2O2H4 hydrogen-bonding rings between two perchlorate anions and two monodentate 4-ampy molecules of adjacent copper(II) cations are alternately arranged. Here, 1 is a special copper(II) complex having monodentate and uncoordinated 4-aminopyridine molecules simultaneously, which is stabilized by highly cooperative supramolecular interactions. Additionally, two other mononuclear CuII/4-ampy complexes formulated as [Cu(phen)2(4-ampy)]·(ClO4)2 (2) and [Cu(phen)3][Cu(phen)2(4-ampy)]2·(ClO4)6 (3) (phen = 1,10-phenanthroline) have been included.