Trinuclear copper(II) complexes of bis(acylhydrazone) ligands. Structural analysis and magnetic properties of a sulfato-bridged hexanuclear dimer |
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Authors: | Alessia Bacchi Giancarlo Pelizzi Lorenzo Sorace |
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Affiliation: | a Dipartimento di Scienze del Farmaco, Università di Sassari, Via Muroni 23/a, I-07100 Sassari, Italy b Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Parco Area delle Scienze 17A, 43100 Parma, Italy c Laboratory of Molecular Magnetism, Dipartimento di Chimica e UdR INSTM di Firenze, Polo Scientifico, Via della Lastruccia, 3, 50019 Sesto Fiorentino (Fi), Italy |
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Abstract: | The synthesis and spectroscopic characterization of the new symmetric, ligand bis(salicylaldehyde)methyliminodiacetylhydrazone (H4MeImds) is reported. The reactions of H4 MeImds with copper(II) chloride, nitrate and sulfate give trinuclear metal complexes of formula Cu3(MeImds)Cl2 · CHCl3 · H2O, Cu3(MeImds)(NO3)2 · 2H2O and Cu3(MeImds)(SO4) · 8H2O; the trinuclear species are obtained in spite of the used metal:ligand molar ratio. The X-ray crystal structure of [Cu3(MeImds)(SO4)(H2O)3] · 5H2O is determined; it consists of linear units, with the nonadentate ligand bound to three copper ions. The trimetallic units are bridged via sulfate anions to give hexanuclear dimers with an imposed centre of symmetry. The magnetic properties of [Cu3(MeImds)(SO4)(H2O)3] · 5H2O are characterized by a significant antiferromagnetic coupling within the trimetallic units and by a weak antiferromagnetic coupling between them. The analogous trinuclear copper(II) complexes Cu3(HImds)Cl2 · H2O and Cu3(HImds)(SO4) · 4H2O (H5Imds, bis(salicylaldehyde)iminodiacetylhydrazone) were also prepared and spectroscopically characterized. |
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Keywords: | Trimetallic complexes Magnetic properties Copper complexes Polydentate ligands Hydrazone ligands |
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