catena-Poly[[(p-toluenesulfonato-κO)silver(I)]-μ-1,3-bis(pyridin-4-yl)propane-κ2 N:N′]

In the title compound, [Ag(C7H7O3S)(C13H14N2)]n, the AgI ion is coordinated in a T-shape by two N atoms from two symmetry-related 1,3-bis(pyridin-4-yl)propane ligands and one O atom from a p-toluenesulfonate ligand, forming a one-dimensional zigzag chain along [001]. In the crystal, weak C—H⋯O hydrogen bonds and weak Ag⋯Ag interactions [3.2628 (5) Å] are observed.

In the title compound, [Ag(C 7 H 7 O 3 S)(C 13 H 14 N 2 )] n , the Ag I ion is coordinated in a T-shape by two N atoms from two symmetry-related 1,3-bis(pyridin-4-yl)propane ligands and one O atom from a p-toluenesulfonate ligand, forming a one-dimensional zigzag chain along [001]. In the crystal, weak C-HÁ Á ÁO hydrogen bonds and weak AgÁ Á ÁAg interactions [3.2628 (5) Å ] are observed.

Feng Ma, Dai-Bao Wei and Zhi-Min Cao Comment
The design and synthesis of metal-organic frameworks (MOFs) have attracted considerable attention in recent years,not only for their intriguing structural diversity, but also because of their potential applications in the area of catalysis (Horike et al., 2008), ion exchange (Liu et al., 2010), magnetism, photochemistry (Lu et al., 2006), and porous materials (Li et al., 1999).
The reactions of silver salts with 1,3-bis(pyridin-4-yl)propane (bpp) have already afforded intresting coordination polymers with distinct structural motifs (Carlucci et al., 2002). Moreover, the combination of Ag cations with mixed ligands of aromatic (Yang et al., 2009;Jin et al., 2009;Zhang et al., 2009) or aliphatic (Luo et al., 2011) carboxylates and bpp can allow the formation of MOFs possessing fascinating architectures and novel topologies. In terms of silver(I) sulfonate complexes, many nitrogen-based secondary ligands such as pyrazine (Pyr) (Li et al., 2005), hexamethylenetetramine (hmt) , pyridine (py) (Smith et al., 1998) and their analogues or derivatives were exploited as secondary ligands to synthesize new metal organic frameworks. Here we report a novel one-dimensional polymer [Ag(C 7 H 7 O 3 S)(C 13 H 14 N 2 )] n assembled by mixed ligands of p-toluenesulfonate and bpp with silver nitrate.
The asymmetric unit of the title compound (I) and symmetry related atoms are shown in Fig. 1. The Ag I cation is coordinated by two N atoms from two symmetry related bpp ligands one O atom from one p-toluenesulfonate ligand. The Ag-O and Ag-N bonds are comparable to those in the literature (Li et al., 2005). As shown in Fig. 2, there are weak Ag···Ag interactions (3.2628 (5)Å) which are shorter than the sum van der Waals radii for Ag···Ag [3.40Å]. Compound (I) is a one-dimensional coordination polymer formed by bpp ligands and Ag cations, with tos ligands as the side chains in which bpp ligands exhibit the TG (Carlucci et al., 2002) conformation and the N···N separation is 8.6746 (2)Å. The weak Ag ···Ag interactions bridge the undulating 1-D chains to form 2-D layers (Fig .2), which are further linked into a threedimensional network via weak C-H···O hydrogen bonds.

Experimental
A solution of bpp and tos in 8 ml methanol and 2 ml water was slowly added to a solution of AgNO 3 (0.1668 g) in 8 ml water. A white suspension formed immediately. An aqueous NH 3 solution (25%) was dropped into the mixture to give a clear solution. The resultant colorless filtrate (pH=9.0) was allowed to evaporate slowly at room temperature. After one week, colorless block crystals were obtained in 52.87% yield (based on Ag). Elemental analysis for (I) (%): calculated: C 50. 3,H 4.4,N 5.9,O 10.1,S 6.7. Found C49.94,H 4.452,N 5.969,O 10.123, S 7.013.

Refinement
All H atoms were positioned geometrically and refined using a riding model with C-H = 0.93-0.98 Å and with U iso (H) = 1.2(1.5 for methyl groups) times U eq (C).