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

In the title compound, [Cu(CH3COO)2(C18H16N2O2)]·4H2O, the CuII ion is six-coordinated in a Jahn–Teller-distorted octahedral geometry environment defined by four O atoms and two N atoms. A chain structure along [100] 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 )]Á4H 2 O, the Cu II ion is six-coordinated in a Jahn-Teller-distorted octahedral geometry environment defined by four O atoms and two N atoms. A chain structure along [100] is built up by intermolecular O-HÁ Á ÁO hydrogen bonds involving the uncoordinated water molecules.
Bis(acetato-O) [1,2-bis(2-pyridylmethoxy)benzene-4 N,O,O',N'] Comment N-Heterocyclic ligands coordinated with transition metal ions can form a variety of topology structures, including macrocycles, polyhedra and linear and helical polymers. Our group has report three kinds of flexible pyridyl-based ligands in previous reports (Liu et al. 20010a;Liu et al. 20010b). As a part of our continuing work for bipyridyl aromatic ligands, we report the crystal structure of the title compound here, and its analogous monohydrate compound also has been reported by our group (Zhang et al. 20010).
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 along [100] direction is built up by intermolecular hydrogen bonds involving the uncoordinated water molecules ( Figure 2, Table 2).
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.