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Issue 26, 2006
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Magnetostructural studies of copper(II)–verdazyl radical complexes

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Abstract

The synthesis, structures, and magnetic properties of several Cu(II) complexes of verdazyl radicals are presented. Reactions of chelating verdazyl radicals with either CuCl2·2H2O or Cu(hfac)2·2H2O produced 1 ∶ 1 Cu ∶ verdazyl complexes with either chloride or hfac ancillary ligands. Structural characterization reveals that the CuCl2 complexes of N,N′-dimethyl-3-(2-pyridyl)-6-oxoverdazyl or N,N′-bis(isopropyl)-3-(2-pyridyl)-6-oxoverdazyl have pseudo-square pyramidal copper ions with verdazyl rings bound in equatorial positions, while the Cu(hfac)2 complex of N,N′-dimethyl-3-(N-methyl-2-imidazolyl)-6-oxoverdazyl is Jahn–Teller distorted pseudo-octahedral and has the verdazyl nitrogen axially bound. Variable temperature magnetic susceptibility studies reveal that equatorially bound verdazyls are strongly antiferromagnetically coupled, while the axially bound radicals are weakly ferromagnetically coupled. Intermolecular magnetic interactions are also an important component of the overall magnetism in these systems.

Graphical abstract: Magnetostructural studies of copper(ii)–verdazyl radical complexes

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Publication details

The article was received on 10 Mar 2006, accepted on 04 May 2006 and first published on 16 May 2006


Article type: Paper
DOI: 10.1039/B603624D
Citation: J. Mater. Chem., 2006,16, 2618-2624
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    Magnetostructural studies of copper(II)–verdazyl radical complexes

    J. B. Gilroy, B. D. Koivisto, R. McDonald, M. J. Ferguson and R. G. Hicks, J. Mater. Chem., 2006, 16, 2618
    DOI: 10.1039/B603624D

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