Supramolecular assembly of [Cu(2,2′-bpy)2(ppac)](H2O)7 (1) and [Cu2(2,2′-bpy)4(ppac)]()2(H2O)16 (2) with unprecedented water morphologies

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In this article, two copper(II) complexes, [Cu(2,2′-bpy)2(ppac)](H2O)7 (1) and [Cu2(2,2′-bpy)4(ppac)]()2(H2O)16 (2), have been synthesized (H2ppac = p-phenylenediacetic acid, 2,2′-bpy = 2,2′-bipyridine). We report structural evidence of discrete water clusters in the solid state. An unusual 1-D water tape notated T4(2)6(2) is present in complex 1. Complex 2 displays a hydrogen-bonded pillar-layered structure that is constituted by lattice waters. An unprecedented water cluster notated as T4(1)6(1)6(2) is present in complex 2. The units act as supramolecular glue in the aggregation of copper(II) complexes to give a 3-D cage-like network through hydrogen bonds. Preliminary investigation on electrochemical properties of the complexes is presented.