Silver(I)/cobalt(II) complexes with mixed V-shaped polycarboxylate and rod-like N-donor ligands: Syntheses, structures and properties

Four Ag(I)/Co(II) complexes based on a flexible V-shaped ligand 3,3', 4,4'-diphenylsulfone tetracarboxylic acid (H(4)dstc), namely [Ag(bpe)(2)]center dot H3dstc (1), {[Ag-2(H(2)dstc)(bpp)(H2O)]center dot(H2O}(n) (2), {[Co-2(dstc)(bpe)(2)(H2O)]center dot 2H(2)O}(n) (3) and {[Co-4(dstc)(2)(bpa)(3)(H2O)(6)]center dot 7H(2)O}(n) (4) have been synthesized in the presence of different rod-like N-donor ligands 1,2-di(4-pyridyl)ethylene (bpe), 1,3-bis(4-pyridyl) propane (bpp), and 1,2-bis(4-pyridyl) ethane (bpa). In complex 1, the H(3)dstc-ligand does not take part in coordination but balances the charge by its one deprotonated carboxylate group. Complex 2 contains two different motifs: a cationic 1D chain [Ag(bpp)](+) and an anionic 1D meso-helix [Ag(H(2)dstc)(H2O)](-). Interestingly, the non-covalent hydrogen bonding interactions extend such simple discrete units or 1D chains into 3D supramolecular architectures. Complex 3 represents a 3D binodal 4-connected (6(4)center dot 8(2)) network, while complex 4 can be simplified as a primitive cubic (pcu) network. In addition, the photoluminescence of 1 and 2 and the magnetism of 3 and 4 are investigated, respectively. (C) 2012 Elsevier B. V. All rights reserved.