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)n, [Ni­(bpy4da)3].(bpc)­(dmf)n, 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.