HALIDE COPPER(II) COMPLEXES OF AROMATIC N-DONOR CONTAINING LIGANDS: STRUCTURAL, MAGNETIC AND REACTIVITY STUDIES
A. Aguirrechu-ComerГіn1, J. PasГЎn1, J. GonzГЎlez-Platas1, J. Ferrando-Soria2, R. HernГЎndez-Molina3
1Universidad de La Laguna, Tenerife, Spain
2Texas A&M University, Texas 77842, USA
3Instituto Universitario de Quimica Bioorganica, La Laguna, Tenerife, Spain
Keywords: copper, structures, halides, magnetism
Abstract
The preparation of four new copper(II) complexes with different N-donor ligands [CuBr2×(2-benzylpyridine)2] (1), [CuBr2(2-benzylpyridine)(2,2'-bipyridine)]×H2O (2), [CuBr2(3-methyl-2-phenylpiridine)2] (3), [Cu(picolinate)2]×KI (4) from copper(I) halides as starting material is described. During the preparation of compound 4 a ligand oxidation reaction took place to give the picolinate ligand starting from 2-(2-methylaminoethyl)pyridine. The complexes were characterized by elemental analyses, IR spectroscopy and crystallographic studies. Single crystal X-ray diffraction analysis of the complexes reveals their monomeric penta- and tetracoordinated nature. For all compounds, the copper(II) present a common square planar coordination except for compound 2 which is five coordinated in a quasi-square pyramidal configuration with t of 0.29. The Cu-N distances for these compounds are in the range of 1.959(4)-2.041(3) Å, Cu-O distance was 1.961(3) Å and Cu-Br distances were in the range of 2.4052(4)-2.4381(6) Å for the square base configuration while for apical distance it was 2.6745(7) Å. Magnetic properties have been investigated for all compounds in the temperature range 2-300 K. Compound 1 shows weak antiferromagnetic intermolecular interaction.
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