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1 2003

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Supramolecular Copper(II) Complexes with Tetradentate Ketoenamine Ligands

El-Boraey H., El-Tabl A.S.

Polish Journal of Chemistry

2003

Vol. 77 / nr 12

1759-1775

A new series of symmetric and unsymmetric supramolecular copper(II) complexes derived from _-diketones and aniline derivatives have been synthesized and characterized by elemental analyses, IR, UV-VIS spectra, magnetic moments, conductances, thermal analyses (DTAand TGA) and ESR measurements. The IR data show that the ligands behave as monobasic bidentate type towards copper(II) ion. The supramolecular structure is achieved through the dimerization of complexes (1), (3), (5) and (6) or polymerization of complexes (2), (4) and (7) via intermolecular hydrogen bonding of the -OH and C=O of carboxylic groups. Molar conductances in DMF solution indicate that the complexes are non-electrolytes. ESR spectra of the solid complexes (1) and (3) at room temperature show axial-type with a dxzground state, however, the complexes (2), (4), (5) and (6) show axial-type spectra with g||>g_ > 2.00, indicating a dx2-y2 ground state with significant covalent bond character. Electronic and ESR spectra show that the complexes represent square planar or tetragonally distorted octahedral geometry. The catalytic properties of the complexes (1) and (5) were investigated by decomposition of hydrogen peroxide.