A novel double-chain silver(I) coordination polymer: catena-poly[[[μ-aqua-aquadisilver(I)]-bis(μ3-5-methylpyrazine-2-carboxylato)] dihydrate]

Abstract

In the title silver(I) coordination polymer, {[Ag2(C6H5N2O2)2(H2O)2]·2H2O}n, the [Ag2(μ2-H2O)(H2O)] cores are extended by antiparallel 5-methylpyrazine-2-carboxylate (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 interactions involving water clusters and carboxylate O atoms link the molecules into a three-dimensional supramolecular architecture, which is further consolidated by weak C—H...O interactions and π–π stacking interactions [centroid–centroid distance 3.643 (5) Å].