Chlorido[4-chloro-2-(pyridin-2-ylmethyliminomethyl)phenolato-κ3 N,N′,O]copper(II)

In the title complex, [Cu(C13H10ClN2O)Cl], the CuII ion is coordinated by one O atom and two N atoms of the tridentate Schiff base ligand and one chloride ion, forming a slightly distorted square-planar geometry. Weak Cu⋯Cl interactions [2.793 (5) Å] result in the formation of a chain along the a axis.

In the title complex, [Cu(C 13 H 10 ClN 2 O)Cl], the Cu II ion is coordinated by one O atom and two N atoms of the tridentate Schiff base ligand and one chloride ion, forming a slightly distorted square-planar geometry. Weak CuÁ Á ÁCl interactions [2.793 (5) Å ] result in the formation of a chain along the a axis.
The molecular structure of title compound is shown in Fig. 1. The Cu ion is four coordinate forming a slightly distorted square planar coordination sphere, in which three positions are occupied by two N atoms and one O atom from the asymmetric tridentate Schiff base ligand, and the other one coming from a coordinated chloride ion. The CuN 2 O unit is located in a well plane with the mean deviation of 0.0035 (3) Å, while the chloro ion is obvious out of the above plane with deviation value 0.1249 (5) Å. The bond distances of Cu-O, Cu-N and Cu-Cl are in the normal range compared to the reported complexes containing the analogous unsymmetrical tridentate Schiff base ligands (Bluhm et al., 2003;Kannappan, et al., 2005;Sun et al., 2005). It is worth noting that the asymmetric unit can be linked into one dimensional double chain structure by the weak Cu···Cl intermolecular interactions.

Experimental
The Schiff base was obtained by condensation 2-(aminomethyl)pyridine and 5-chloro-2-hydroxy-benzaldehyde with the ratio 1:1 in methanol. The synthesis of the title complex was carried out by the reaction of CuCl 2 .6H 2 O and the Schiffbase ligand (1:1, molar ratio) in methanol under the stirring condition at room temperature. The filtrated solution was allowed to partial evaporation and blue single crystals suitable for X-ray diffraction were afforded with the yield about 60% sevral days later.

Refinement
All the H atoms bonded to the C atoms were placed using the HFIX commands in SHELXL-97, with C-H distances of 0.93 and 0.96 Å, and were allowed for as riding atoms with U iso (H) = 1.2U eq (C).

Chlorido[4-chloro-2-(pyridin-2-ylmethyliminomethyl)phenolato-κ 3 N,N′,O]copper(II)
Crystal data Special details Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 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.