Abstract
Flexidentate ligand, HL has been prepared by the condensation of aminoethylethanolamine (AEEA) with benzoylacetone (bezac). On reaction with copper(II) salts it gives complexes CuLClO4.H2O (1), CuLN3 (2) and [Cu3L3Br]Br2.H2O (3). All complexes have been characterized by X-ray crystallography. The results show that the hydroxyl group of the flexidentate ligand can coordinate to the Cu(II) center or remain as an uncoordinated group. In (1), the coordination number around the copper(II) ion is five coordinated and the ligand is tetradentate with the OH group coordinated to the copper(II) ion. Complex (2) has a square planar geometry and the L- ligand is tridentate with the hydroxyl group left uncoordinated. The X-ray diffraction analysis of the trinuclear complex (3) shows that the copper(II) centers are five-coordinate and L- is a tetradentate ligand with the hydroxyl group being both terminal and bridging. The Hirshfeld surface analysis and the 2D fingerprint plot were used to analyze all of the intermolecular contacts in the crystal structures.
Highlights
The ability of transition metal ions to bond to possible coordination sites of these ligands depends on the type of the metal ion, the donor atoms of the ligand, the flexibility of the ligand and the counter-anions used
ClO4– and halogens), but the hydroxyl group remains as an uncoordinated OH group when the other coordination sites of the metal ions are occupied by strongly coordinating groups.[13,14,15,16,17]
This flexidentate ligand can be tridentate or tetradentate with copper(II), depending on the coordinating abilities of the other ligands which are present; the hydroxyl group of this ligand may coordinate to Cu(II) or may remain uncoordinated
Summary
The design and synthesis of new transition metal complexes with polynuclating ligands, which represent themselves as potential chelating ligands with more than set of donor atoms, have been of interest for many years.[1,2,3,4,5,6,7] The ability of transition metal ions to bond to possible coordination sites of these ligands depends on the type of the metal ion, the donor atoms of the ligand, the flexibility of the ligand and the counter-anions used. We report the synthesis, spectral characterization and crystal structure of several new copper(II) complexes formed by the reaction of the flexidentate Schiff base ligand aminoethyl ethanolamine benzoylacetone, HL (scheme 1), with Cu(II) in the presence of several counter anions. The Schiff base ligand was obtained by condensation of 2-((2-aminoethyl)amino)ethan-1-ol (aminoethylethanolamine, AEEA) and benzoylacetone (bezac). This flexidentate ligand can be tridentate or tetradentate with copper(II), depending on the coordinating abilities of the other ligands which are present; the hydroxyl group of this ligand may coordinate to Cu(II) or may remain uncoordinated
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