Bis(acetato-κO)[1,2-bis(2-pyridylmethoxy)benzene-κ4 N,O,O′,N′]copper(II) monohydrate

In the title compound, [Cu(CH3COO)2(C18H16N2O2)]·H2O, the CuII ion is six-coordinated in a typically Jahn–Teller distorted octahedral environment defined by two O and two N atoms from the ligand and two O atoms from acetate anions. A linear chain structure propagating in [010] is built up by intermolecular O—H⋯O hydrogen bonds involving the uncoordinated water molecules.

In the title compound, [Cu(CH 3 COO) 2 (C 18 H 16 N 2 O 2 )]ÁH 2 O, the Cu II ion is six-coordinated in a typically Jahn-Teller distorted octahedral environment defined by two O and two N atoms from the ligand and two O atoms from acetate anions. A linear chain structure propagating in [010] is built up by intermolecular O-HÁ Á ÁO hydrogen bonds involving the uncoordinated water molecules.
1,2-Bis(pyridin-2-ylmethoxy)benzene molecule act as a chelating ligand to coordinate with Cu II ion forming a discrete strucutre. Two acetate counter ions also coordinate to the center Cu II ion, resulting the Cu II ion is six-coordinated in quadrangular bipyramid geometry ( Figure 1, Table 1).
A one-dimensional chain structure is built up by intermolecular hydrogen bonds involving the uncoordinated water molecules ( Figure 2, Table 2).

Experimental
The 1,2-Bis(pyridin-2-ylmethoxy)benzene was synthesized by the reaction of ο-dihydroxybenzene and 2-chloromethylpyridine hydrochloride under nitrogen atmosphere and alkaline condition (Liu et al., 2010a). Title ligand (0.58 g, 2 mmol) and Cu(CH 3 COO) 2 .H 2 O (0.40 g, 2 mmol) were dissolved in 15 mL e thanol, and then the mixture keep stirring for 30 minute. The resulting solution was filtered, and the filtrate was allowed to stand in a desiccator at room temperature for several days. Bule needle crystals were obtained with yield 34 %.

Refinement
H atoms bound to C atoms were placed in calculated positions and treated as riding on their parent atoms, with C-H = 0.93 Å (aromatic C), C-H = 0.97 Å (methene C), C-H = 0.98 Å (methyl C), and with U iso (H) = 1.2U eq (C). Water H atoms were initially located in a difference Fourier map but they were treated as riding on their parent atoms with O-H = 0.85 Å, and with U iso (H) = 1.5U eq (O).

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq