Poly[aquabis[μ3-4-(3-pyridyl)pyrimidine-2-sulfonato-κ4 N 4:N 1,O:O][μ2-4-(3-pyridyl)pyrimidine-2-sulfonato-κ3 N 4:N 1,O]trisilver(I)]

In the crystal structure of the title compound, [Ag3(C9H6N3O3S)3(H2O)2]n, the molecules are linked into three-decked polymeric zigzag chains propagating in [100]. On the middle deck, the Ag atom is five-coordinated by three O atoms from three 4-(3-pyridyl)pyrimidine-2-sulfonate (L) ligands, one of which lies on a mirror plane with the sulfonate group disordered over two orientations in a 1:1 ratio, and two N atoms from two L ligands, which lie on the same mirror plane. On the upper and lower decks, the Ag atom is four-coordinated by an aqua ligand, one O and two N atoms from two L ligands with the pyridyl and pyrimidine rings twisted at 19.8 (2)°. In the polymeric chain, there are π–π interactions between six-membered rings of L ligands from different decks with centroid–centroid distances of 3.621 (7) and 3.721 (3) Å. In the crystal, intermolecular O—H⋯O hydrogen bonds link further these three-decked chains into layers parallel to (010).

In the crystal structure of the title compound, [Ag 3 (C 9 H 6 -N 3 O 3 S) 3 (H 2 O) 2 ] n , the molecules are linked into three-decked polymeric zigzag chains propagating in [100]. On the middle deck, the Ag atom is five-coordinated by three O atoms from three 4-(3-pyridyl)pyrimidine-2-sulfonate (L) ligands, one of which lies on a mirror plane with the sulfonate group disordered over two orientations in a 1:1 ratio, and two N atoms from two L ligands, which lie on the same mirror plane. On the upper and lower decks, the Ag atom is fourcoordinated by an aqua ligand, one O and two N atoms from two L ligands with the pyridyl and pyrimidine rings twisted at 19.8 (2) . In the polymeric chain, there areinteractions between six-membered rings of L ligands from different decks with centroid-centroid distances of 3.621 (7) and 3.721 (3) Å . In the crystal, intermolecular O-HÁ Á ÁO hydrogen bonds link further these three-decked chains into layers parallel to (010).

Comment
Remarkable attention has been paid to the rational design and assembly of new coordination polymers with thioethers in recent years (Dong et al., 2009;Fang et al., 2010;Zhu, 2010). Herein we present the title compound, (I) -the newly synthesized compound derived from 4-(2-pyridinyl)pyrimidine-2-thiol.
The molecular structure of title compound with the atom-numbering scheme is shown in Fig. 1. It crystallizes in the centrosymmetric space group \'-P 2ac 2n'. Ag1 is tetracoordinated and Ag2 is pentacoordinate. Ag1 is coordinated by two N atom from two L ligands and one coordinated water molecule as well as one O atom from the SO 3 group. The two N atoms from different ligands are in a slightly distorted linear geometry with an N-Ag-N bond angle of 160.8°. Ag2 is bound by two different N atoms located from two ligands, and thee O donors from the three different SO3 group.
The molecules are linked into three-decked polymeric zigzag chains propagated in [100]. On the middle deck, which is situated on a mirror plane, the Ag centre is five-coordinated by three O atoms from three ligands L, one of which lies on a mirror plane with the disordered sulfonato group over two orientations in a 1:1 ratio, and two N atoms from two ligands L, which lie on the same mirror plane. On the upper and lower decks, each Ag centre is four-coordinated by aqua ligand, one O and two N atoms from two ligands L with the pyridyl and pyrimidine rings twisted at 19.8 (2)°. In the polymeric chain, there are π-π interactions between six-membered rings of ligands L from different decks (Table 1).
In the crystal structure, intermolecular O-H···O hydrogen bonds l (Table 2) ink further these three-decked chains into layers parallel to ac plane.

Experimental
All solvents and chemicals were of analytical grade and were used without further purification. The title compound was prepared by similar procedure reported in the literature (Dong et al., 2009;Fang et al., 2010;Zhu, 2010). To a suspension of NaL 2 (26.0 mg, 0.1 mmol) in water (5 ml) in a tube, a solution of AgNO 3 (8.5 mg, 0.05 mmol) in acetonitrile (5 ml) was very slowly dropped. Crystal products formed after two weeks standing in a dark. Single crystals suitable for X-ray diffraction were grown from methanol solution by slow evaporation in air at room temperature.

Refinement
All hydrogen atoms were geometrically positioned (C-H 0.93 Å; O-H 0.96 Å) and refined as riding, with U iso (H)=1.2-1.5 U eq of the parent atom.  Fig. 1. A portion of the polymeric structure of (I) showing the atomic numbering and 30% probability displacement ellipsoids [symmetry code: (a) x, 0.5 -y, z]. For the disordered sulfonato group with the atoms O5, O6 and O7 only one orientation is shown.