(Dicyanamido)[2-(2-pyridylmethyliminomethyl)phenolato]copper(II) monohydrate

The title compound, [Cu(C13H11N2O)(C2N3)]·H2O, is a mononuclear copper(II) complex in which the CuII ion has a slightly distorted square-planar geometry and is coordinated by two N atoms and one O atom from the Schiff base ligand and by an N atom from dicyanamide. The O atoms of water molecules contribute to O—H⋯N, O—H⋯O hydrogen bonds, leading to the formation of sheets parallel to the ac plane. There are also weak interactions between inversion-related molecules.

The title compound, [Cu(C 13 H 11 N 2 O)(C 2 N 3 )]ÁH 2 O, is a mononuclear copper(II) complex in which the Cu II ion has a slightly distorted square-planar geometry and is coordinated by two N atoms and one O atom from the Schiff base ligand and by an N atom from dicyanamide. The O atoms of water molecules contribute to O-HÁ Á ÁN, O-HÁ Á ÁO hydrogen bonds, leading to the formation of sheets parallel to the ac plane. There are also weak interactions between inversion-related molecules.

Comment
Transition metal compounds containing Schiff base ligands have been of great interest for many years. These compounds play an important role in the development of coordination chemistry due to their potential applications in catalysis and enzymatic reactions, magnetism and molecular architecture (You & Zhu, 2004;Li & Zhang, 2004). Here we report the structure of a complex that is formed by Cu(CH 3 COO) 2 , the Schiff base ligand 2-(pyridin-2-ylmethyliminomethyl)phenol and sodium dicyanamide.
As shown in Fig. 1, the asymmetric unit consists of a mononuclear [Cu(C 13 H 11 N 2 O)N(CN) 2 ] and a H-bonded water molecule. The central Cu II ion is four-coordinate and adopts a slightly distorted square-planar geometry that is defined by two N atoms and one O atom from the Schiff base ligand and another N atom from dicyanamide. The C7=N1 and C8-N1 distances of 1.293 (4) Å and 1.466 (4) Å indicate double and single bonds respectively. The bond angles around the Cu II centre show some deviations from ideal square-planar geometry (You et al., 2004). Also, the closeness of the planes of inversion related molecules imply weak intramolecular interactions cross an inversion centre such that the distance between Cu1 and O1 of an inversion related phenolato is 2.814 (2) Å, which is much longer than Cu-O bond length.
The resulting yellow solution was continuously stirred for about 30 min at room temperature, and then Cu(CH 3 COO) 2 ·H 2 O (0.200 g, 1 mmol) in aqueous solution (5 mL) was added with stirring homogeneously. Dark blue crystals suitable for X-ray ananlysis were obtained by slow evaporation at room temperature over several days (Zhang et al., 2005).

Refinement
Water H atoms were located in a difference map and refined with distance restraints of O1W-H = 0.87 (2). Other H atoms were placed in calculated positions and allowed to ride on their attached C atoms with U iso (H) = 1.2Ueq(C). Fig. 1. The molecular structure of the title compound with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level.