Metal Complexes of 2,2′-Bipyridine-4,4′-diamine as Metallo-Tectons for Hydrogen Bonded Networks

Transition metal complexes of the ligand 2,2′-bipyridine-4,4′-diamine (bpy4da) form three-dimensional (3D) hydrogen bonding networks with the [M­(bpy4da)₃]²⁺ species, a hydrogen donor metallo-tecton with carboxylate counteranions as hydrogen bond acceptors within the complexes [[Ni­(bpy4da)₃]·(Hbpc)­(bpc)_0.5(dmf)_<i>n</i>, [Ni­(bpy4da)₃].(bpc)­(dmf)_<i>n</i>, and [Ni­(bpy4da)₃]·(Htma)·4­(dmf) where H₂bpc = biphenyl-4,4′-dicarboxylic acid, H₃tma = trimesic acid, and dmf = dimethylformamide. Terephthalate, on the other hand, bridges between Cu­(II) centers in complexes [Cu₂(bpy4da)₄(tpa)]·2­(NO₃)·5­(dmf) and [Cu₂(bpy4da)₄(tpa)]·2­(NO₃)·4.5­(dmf)·(H₂O) (where H₂tpa = terephthalic acid) whose structures both feature different 3D hydrogen bonded networks. The crystal structures of hydrated [Cd­(bpy4da)₃]·2Cl and [Co­(bpy4da)₂(NO₃)]₂·2­(NO₃)·4.5­(dmf) are also reported