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Issue 33, 2010
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New dinuclear nickel(II) and iron(II) complexes with a macrocyclic ligand containing a N6S2 donor-set: Synthesis, structural, MALDI-TOF-MS, magnetic and spectroscopic studies

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Abstract

A series of dinuclear Ni(II) and Fe(II) complexes with a Py2N4S2 coordinating octadentate macrocyclic ligand L prepared by direct reactions have been studied. The overall geometry and bonding mode have been deduced on the basis of elemental analysis data, infrared, MALDI-TOF-MS, UV-vis spectroscopy, X-ray diffraction, conductivity and magnetic susceptibility measurements. In general both M2+ centres are sited into the macrocyclic cavity coordinated to a pyridinic nitrogen atom, one sulfur atom, two secondary amine groups from the macrocyclic backbone and completing the coordination spheres with two solvent or anionic molecules in a distorted octahedral geometry, except in the case of [Ni2L(μ-Cl)(H2O)2](BF4)3·2H2O, where the metal ions are sited in the macrocyclic cavity coordinated to a pyridinic nitrogen atom, one sulfur atom, two secondary amine groups from the macrocyclic backbone, one water molecule and one chloride ion acting as a bridge between the two centres in a distorted octahedral geometry. The magnetic properties of the nickel(II) complexes, [Ni2L(CH3CN)4](BF4)4·3.5CH3CN (11) and [Ni2L(μ-Cl)(H2O)2](BF4)3·2H2O (12) has been recorded in the solid state and indicates an unexpected ferromagnetic exchange in both cases, especially in compound 11 because no similar systems are previously reported in the literature presenting this magnetic behaviour. Further complexes with similar ligands are in progress to corroborate this unexpected ferromagnetic behaviour.

Graphical abstract: New dinuclear nickel(ii) and iron(ii) complexes with a macrocyclic ligand containing a N6S2 donor-set: Synthesis, structural, MALDI-TOF-MS, magnetic and spectroscopic studies

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Publication details

The article was received on 22 Mar 2010, accepted on 01 Jun 2010 and first published on 21 Jul 2010


Article type: Paper
DOI: 10.1039/C0DT00182A
Citation: Dalton Trans., 2010,39, 7673-7683
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    New dinuclear nickel(II) and iron(II) complexes with a macrocyclic ligand containing a N6S2 donor-set: Synthesis, structural, MALDI-TOF-MS, magnetic and spectroscopic studies

    C. Núñez, R. Bastida, A. Macías, L. Valencia, J. Ribas, J. L. Capelo and C. Lodeiro, Dalton Trans., 2010, 39, 7673
    DOI: 10.1039/C0DT00182A

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