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Magnetic properties of copper(II) complexes containing peptides. Crystal structure of [Cu(phe-leu)]

2006; Elsevier BV; Volume: 797; Issue: 1-3 Linguagem: Inglês

10.1016/j.molstruc.2006.03.058

1872-8014

J. Sanchíz, Carlos Kremer, Marı́a H. Torre, Gianella Facchin, E. Kremer, E.E. Castellano, Javier Ellena,

Metal-Catalyzed Oxygenation Mechanisms

A novel copper(II) complex containing the peptide phe-leu has been prepared and characterized. The crystal structure of [Cu(phe-leu)] (1) was determined by X-ray diffraction. The presence of carboxylate and amido bridges allows the formation of an extended 2D arrangement. This structure is similar to those found in [Cu(gly-val)] · 1/2H2O (2), [Cu(val-gly)] (3), [Cu(val-phe)] (4), and [Cu(phe-phe)] (5). The magnetic properties of compounds 1–5 were studied and analyzed comparatively. The experimental data show that the magnetic interactions are mainly transmitted through μ2-COO− bridges, being ferromagnetic for 1 and 3, and antiferromagnetic for 2, 4 and 5.