catena-Poly[[dichloridozinc(II)]-μ-1,4-bis(pyridin-2-ylmethoxy)benzene-κ2 N:N′]

In the title compound, [ZnCl2(C18H16N2O2)]n, the ZnII ion is tetrahedrally coordinated by two Cl atoms and by two N atoms from different 1,4-bis(pyridin-2-ylmethoxy)benzene ligands. The ligand shows a non-planar configuration, in which the dihedral angles between the two terminal pyridine rings and the linking benzene ring are 7.86 (12) and 70.74 (11)°. The flexible ligand coordinates to the ZnII ions, generating an infinite chain propagating along [001].

In the title compound, [ZnCl 2 (C 18 H 16 N 2 O 2 )] n , the Zn II ion is tetrahedrally coordinated by two Cl atoms and by two N atoms from different 1,4-bis(pyridin-2-ylmethoxy)benzene ligands. The ligand shows a non-planar configuration, in which the dihedral angles between the two terminal pyridine rings and the linking benzene ring are 7.86 (12) and 70.74 (11) . The flexible ligand coordinates to the Zn II ions, generating an infinite chain propagating along [001].
The ligand is oriented in a divergent fashion, in which the dihedral angles between two terminal pyridine rings with the linking benzene ring are 7.86 (12) and 70.74 (11)°. In the crystal packing, the flexible ligands link the Zn II atoms to generate an infinite chain running along [001].

Experimental
The 1,4-bis(pyridin-2-ylmethoxy)benzene ligand was synthesized as the reference method (Liu et al., 2010a,b). The title compound was produced by reaction of ZnCl 2 (0.50 mmol,0.068 g) in water (5 mL) and 1,4-bis(pyridin-2ylmethoxy)benzene (0.5 mmol, 0.146 g) in 5 mL methanol under constant stirring, and filtered after stirring for about one hour. The filtate was maintained for about one week under the room temperature to give colorless block-like crystals suitable for X-ray analysis.

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 > 2sigma(F 2 ) is used only for calculating R-factors(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.