Synthesis, structure, and magnetism of a binuclear Co(II) complex of a potentially bis-tridentate verdazyl radical ligand |
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Authors: | Martin T. Lemaire Laurence K. Thompson |
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Affiliation: | a Department of Chemistry, University of Victoria, P.O. Box 3065 STN CSC, Victoria, BC, Canada V8W 3V6 b Department of Chemistry, Box 9573, North Harris College, Houston, TX 77073, USA c Department of Chemistry, Memorial University of Newfoundland, St. Johns, Nfld, Canada A1B 3X7 |
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Abstract: | The synthesis, structure, and magnetic properties of a dinuclear Co(II) complex of a tridentate verdazyl radical are presented. The reaction of a tetrazane containing a 4,6-bis(2-pyridyl)-pyrimid-2-yl substituent with cobalt chloride hexahydrate in aerated solution leads to in situ oxidation of the tetrazane to a verdazyl radical which is coordinated to Co(II) in a tridentate manner. The second tridentate coordination site of the verdazyl remains vacant. The crystal structure reveals the complex to be dimeric, with the cobalt ions linked by two bridging chlorides. The structure of Co2Cl2 core is highly asymmetric, with two short (2.3317 Å) and two long (2.744 Å) Co-Cl bonds. There are relatively short intermolecular contacts between coordinated verdazyl radicals in the solid state. Magnetic susceptibility data from 2 to 300 K suggest intramolecular ferromagnetic interactions, and modeling of the high-temperature data produced a best fit with JCo-verdazyl of +20 cm−1. |
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Keywords: | Cobalt complexes Verdazyl radicals Magnetism |
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