catena-Poly silver(I)-mu(2)-4,4 ‘-bipyridine-kappa N-2:N ‘-mu(3)-chlorido : self-assembly of a two-dimensional bilayer silver(I) coordination polymer from AgCl and a bipodal spacer

National Natural Science Foundation of China [20721001]; MSTC [2007CB815301]The title compound, [AgCl(C10H8N2)](n), was synthesized by reaction of silver(I) chloride with 4,4'-bipyridine (bipy) under ammoniacal conditions. The crystal structure reveals that the Ag and Cl atoms lie on twofold axes, while the bipy ligands also sit across twofold axes. The Ag-I center is five-coordinated by three Cl atoms and two N atoms from two symmetry-related bipy ligands in a distorted square-pyramidal geometry. The complex contains one-dimensional Ag-I-bipy chains, which are further linked by rarely formed T-frame mu(3)-Cl to form a two-dimensional bilayer structure