Abstract
Abstract A new copper(II) chelate of the Schiff base derived from pyruvic acid and ethanolamine has been prepared. The crystal structure of this complex, [Cu(pyv=etham)2]·4H2O, has been determined from three dimensional X-ray diffraction data. The dimensions of monoclinic cell are a=6.50Å, b=19.75Å, c=7.26Å, β=113.0° and Z=2. The space group is P21⁄n. The structure has been refined by three dimensional difference syntheses to R=0.126. It has been disclosed that copper (II) links to the 2-hydroxyethyliminopyruvate anion through the terminal carboxylate group, and the nitrogen of the Schiff base linkage. Having a center of symmetry, the complex molecule is in the trans-configuration and has normal bond distances and angles. The coordination around copper(II) is square planar; the Cu–O and Cu–N distances are 1.92 and 2.00Å, respectively. Two additional oxygen atoms of the water molecules at 2.57Å complete a distorted octahedron around copper(II). The complex molecules are held together in the crystal by the O–H···O hydrogen bonds, forming a three dimensional network.
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