catena-Poly[[[(2-phenylacetato-κO)zinc(II)]bis[μ-4,4′-(disulfanediyl)dipyridine-κ2 N:N′]] monohydrate]

In the title compound, {[Zn(C8H7O2)2(C10H8N2S2)2]·H2O}n, the ZnII atom is coordinated by four N atoms from four 4,4′-(disulfanediyl)dipyridine (bpds) ligands and two O atoms from two 2-phenylacetate anions in a distorted octahedral coordination geometry. The two bpds ligands of the same axial chirality bridge ZnII atoms, generating repeated rhomboidal chains, which are linked by O—H⋯O hydrogen bonds into a ladder structure.

In the title compound, {[Zn(C 8 H 7 O 2 ) 2 (C 10 H 8 N 2 S 2 ) 2 ]ÁH 2 O} n , the Zn II atom is coordinated by four N atoms from four 4,4 0 -(disulfanediyl)dipyridine (bpds) ligands and two O atoms from two 2-phenylacetate anions in a distorted octahedral coordination geometry. The two bpds ligands of the same axial chirality bridge Zn II atoms, generating repeated rhomboidal chains, which are linked by O-HÁ Á ÁO hydrogen bonds into a ladder structure.

Experimental
Crystal data [Zn(C 8 H 7 O 2 ) 2 (C 10 H 8 N 2 S 2 ) 2 ]ÁH 2 O M r = 794.27 Triclinic, P1 a = 9.851 (2) Å b = 11.130 (2) Å c = 18.319 (4) Table 1 Hydrogen-bond geometry (Å , ). Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97. This project was supported by the National Natural Science Foundation of China (grant No. 20072022) and the Education Department of Zhejiang Province. Grateful thanks are also extended to the K. C. Wong Magna Fund in Ningbo University. [ -4,4'-(disulfanediyl) Recently, a variety of pyridyl-donor ligands have been widely employ to construct coordination polymers with intriguing topologies and unexpected properties (Biradha et al., 2006;Liu et al., 2008;Hernández-Ahuactzi et al., 2008;Ma, Wang, Hu et al., 2009). 4,4'-dipyridyl disulfide (bpds) is a bipyridyl-type ligand with a twisted structuret. Addtionally, bpds ligand has axial chirality. A number of coordination polymers containing bpds ligand have been reported (Horikoshi et al., 2006;Carballo et al., 2008;Ma, Wang, Wang et al., 2009). Phenylacetic acid is one of the most common carboxylate ligands and can adopt different coordination modes (Johnston et al., 2008). However, the coordination polymers based on mixed bpds and phenylacetate anion have not been reported to date. In this paper, we report the title Znic polymeric compound, [{Zn(bpds) 2 (C 6 H 5 CH 2 COO) 2 }.H 2 O] n with a 1D repeated rhomboidal chain structure. The unsymmetrical unit of the title compound consisits of one Zn 2+ cation, two bpds molecules of the same chirality, two phenylacetate anions and one lattice water molecule (Fig.1).The M-and P-bpds molecules act as bis-monodentate bridging ligands with the C-S-S-C torsion angle being 97.10 (1)° and 93.40 (1)°, respectively, and the corresponding py ring planes form dihedral angles of 89.06 (6)° and 79.42 (6)°. Both crystallographically distinct phenylacetate anions monodentately coordinate to the metal atoms.The Zn atom has a distorted octahedral environment, being surrounded by two nitrogen atoms from two M-bpds and two nitrogen atoms from two P-bpds in the equatorial plane, and by two oxygen atoms from two crystallographically distinct phenylacetate anions occupying the axial positions. The corresponding bond distances range from 2.111 (2)Å to 2.202 (2) Å, and the bond angles in the region 84.12 (7)-175.94 (7)° deviate from the values of 90° and 180° for an ideal octahedron (table 1). Along the [110] direction, the two bpds ligands of the same chirality bridge Zn atoms to form 1D repeated rhomboidal chains (Fig. 2), which is similar with the structures of the reported zinc coordination polymers based on bpds ligand (Horikoshi et al., 2005). The Zn···Zn separation through bpds ligands is 11.187 Å. The lattice water form hydrogen bonds to the uncoordinated carboxylate oxygen atoms of two different phenylacetate anions. In this way, the adjacent chains are linked by water molecules to give a ladder structure.

catena-Poly[[[(2-phenylacetato-O)zinc(II)]bis
Experimental 0.0750 g (0.25 mmol) Zn(NO 3 ) 2 .6H 2 O and 0.0345 g (0.25 mmol) phenylacetic acid were succesively dissolved in a stirred aqueous ethanolic solution consisting of 5 ml EtOH and 10 ml H 2 O, to which 0.5 ml 1.0 M NaOH was added. The formed white suspension was stirred at 80°C for 30 min and then added was an ethanolic solution of 0.0570 g (0.25 mmol) 4,4'dipyridyldisulfide in 5 ml EtOH. The final mixture was further stirred at 75°C for 1 h and filtered off. The colorless filtrate (pH=6.02) was left standing at room temperature for one week affording colorless block-like crystals (yield: 4 mg).
supplementary materials sup-2 Refinement H atoms bonded to C atoms were palced in geometrically calculated position and were refined using a riding model, with U iso (H) = 1.2 Ueq(C). H atoms attached to O atoms were found in a difference Fourier synthesis and were refined using a riding model, with the O-H distances fixed as initially found and with U iso (H) values set at 1.2 Ueq(O). Fig. 1. View of the molecular of the title compound, Displacement ellipsoids are drawn at the 45% probability level.   [µ-4,4'-(disulfanediyl)

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.