Self-assembly of new three-dimensional molecular architectures constructed from silver(I)-hexamethylenetetramine layers with supramolecular interactions

Three new co-ordination polymers [Ag(mu(3)-hmt)](abs) 1, [Ag(mu(3)-hmt)](ns).0.5(benzene).2H(2)O2, and [Ag(mu(3)-hmt)](2)- [ Ag(NH3)(2)](2)(pma).3H(2)O3 (hmt = hexamethylenetetramine, abs = 4-aminobenzenesulfonate, ns = 2- naphthalenesulfonate and pma = 1,2,4,5-benzenetetracarboxylate), have been prepared and structurally characterised. In these compounds, the metal ions and the mu(3)-hmt ligands are covalently interconnected into hexagonal two-dimensional layers, whereas supramolecular interactions, such as weak Ag...O contacts, hydrogen bonds and/or pi-pi stacking, play an important role in the construction of three-dimensional molecular architectures. The observation of dimeric [Ag(NH3)(2)](2)(2+) species trapped in such co-ordination surroundings in 3 is unprecedented.