X-ray crystal structure, ESR and potentiometric studies of copper(II) complexes with (2-pyridylmethyl, 3-pyridylmethyl) amine ligand

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Abstract

In this paper, we describe the coordinating behaviour of the (2-pyridylmethyl, 3-pyridylmethyl) amine ligand with the copper(II) ion. This ligand is bidentate and forms, in accordance with the pH values, 1:1 and 1:2 species (ratio metal:ligand). These species were characterized in aqueous solution by ESR spectroscopy and their overall stability constants were determined by potentiometric measurements. In solid state, we obtained the compounds [CuLHCl2](BF4) and [CuL2](BF4)2. In ESR spectroscopy, the first compound is characterized by an axial g tensor (g=2.268 and g=2.091), whereas the second one is characterized by a rhombic g tensor (g1=2.185, g2=2.146 and g3=2.026). We crystallized the [CuLHCl2]Cl compound, in hydrochloric medium, from the [CuLHCl2](BF4) powder. The compound obtained is a pseudo octahedral dimeric system, in which each copper(II) is surrounded by two nitrogen atoms and four chloride ions. The intramolecular Cu–Cu distance is 3.859 Å.

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Supplementary material

All chemicals were of reagent grade quality, obtained from commercial suppliers and used without further purification. Elemental analyses for carbon, hydrogen and nitrogen were carried out on a Perkin–Elmer 2400 C, H, N elemental analyser in our University. Chloride analysis was performed potentiometrically using silver nitrate and metal analysis on an ICP AES Liberty Series II Varian apparatus.

Magnetic susceptibilities were determined at room temperature (20 °C) using HgCo(SCN)4 as calibrant;

Acknowledgements

We thank Dr. A. de Cian (Université Louis Pasteur, Strasbourg, France) for the single-crystal X-ray analyses. The region Champagne-Ardenne is acknowledged for a grant to M.S.

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