title: A novel double-chain silver(I) coordination polymer: catena-poly[[[μ-aqua-aqua-disilver(I)]-bis-(μ(3)-5-methyl-pyrazine-2-carboxyl-ato)] dihydrate].
abstract: In the title silver(I) coordination polymer, {[Ag(2)(C(6)H(5)N(2)O(2))(2)(H(2)O)(2)]·2H(2)O}(n), the [Ag(2)(μ(2)-H(2)O)(H(2)O)] cores are extended by anti-parallel 5-methyl-pyrazine-2-carboxyl-ate (L) ligands, forming a novel double-chain structure. Both Ag(+) cations show a distorted square-pyramidal coordination. Ag1 is bonded to two water molecules, one L N atom, one N atom and one carboxylate O atom from a neighbouring L, whereas Ag2 is surrounded by two L N atoms, two L carboxylate O atoms and one bridging water molecule. O-H⋯O hydrogen-bonding inter-actions involving water clusters and carboxyl-ate O atoms link the mol-ecules into a three-dimensional supra-molecular architecture, which is further consolidated by weak C-H⋯O inter-actions and π-π stacking inter-actions [centroid-centroid distance 3.643 (5) Å].
authors.affiliation: Department of Chemistry, Shangqiu Normal University, Shangqiu 476000, Henan, People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhai
authors.forename: Xiangfei
authors.initials: X
authors.lastname: Zhang
authors.forename: Maotian
authors.initials: M
authors.lastname: Xu