Formation of Three New Silver(I) Coordination Polymers Involving 1,2-Phenylenediacetic Acid via the Modulation of Dipyridyl-Containing Ligands

Three new silver(I) metal−organic frameworks (MOFs), namely, [Ag2(pda)(bipy)2]n·4nH2O (1), [Ag2(pda)(dpe)2(H2O)]n·4nH2O (2), and [Ag(Hpda)(bpp)]n (3), were prepared by hydrothermal reactions of silver(I) acetate with H2pda (H2pda = 1,2-phenylenediacetic acid) in the presence of different pyridyl-containing ligands (bipy = 4,4′-bipyridine, dpe = 1,2-di(4-pyridyl)-ethylene, and bpp = 1,2-bis(4-pyridyl)propane) and structurally characterized by single crystal X-ray diffraction. Complex 1 shows a two-dimensional (2D) four-connected network with a long topological vertex Schlafli symbol (4.62.4.63.64.6). Of particular interest, a new unreported octameric water cluster, (H2O)8, which is comprised of a cyclic water tetramer and four dangling water monomers, exists in 1. And the pseudorotaxane motifs are formed by these octameric clusters and the [Ag8(pda)2(bipy)4] loops. Complex 2 features a one-dimensional (1D) ladder-like chain structure, and the 2D networks, assembling by the combination of the pentameric wat...