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Cobalt(II) complexes of the 2-aminopicolineN-oxides and 2-amino-4, 6-lutidineN-oxide

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Summary

Cobalt(II) complexes of the four 2-aminopicolineN-oxides and 2-amino-4, 6-lutidineN-oxide were prepared from Co(BF4)2 and CoCl2, and characterized by partial elemental analyses, magnetic moments, molar conductivities, thermal analyses, and by plasma desorption mass, i.r., electronic, and e.s.r. spectroscopy. The compounds derived from CoCl2 are 4-coordinate, tetrahedral, molecular solids with CoO2Cl2 chromophores. Dq values range from 332 to 382 cm−1 and those of B from 758 to 813 cm−1 for the five solids. Three of the compounds prepared from Co(BF4)2 are octahedral with the following stoichiometry: [CoL6](BF4)2 where L=2-amino-4-picolineN-oxide and [CoL5(H2O)] (BF4)2 where L is either 2-amino-3-or 2-amino-5-picolineN-oxide. Both 2-amino-6-picolineN-oxide and 2-amino-4, 6-lutidineN-oxide gave square planar [CoL 2+4 ] complex ions. While numerous square planar cobalt(II) centers are known, those described here are probably the first examples with monodentate ligands and a CoO4 center. They have weak e.s.r. spectra, magnetic moments between 2 and 3 BM and characteristic d-d spectra.

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Authors and Affiliations

  1. Department of Chemistry, Illinois State University, 61761, Normal, Illinois, USA

    Douglas X. West & John C. Severns

  2. National Institute of Diabetes, Digestive and Kidney Diseases, National Insttutes of Health, 20892, Bethesda, MD, USA

    Lewis K. Pannell

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  1. Douglas X. West
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  2. John C. Severns
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  3. Lewis K. Pannell
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West, D.X., Severns, J.C. & Pannell, L.K. Cobalt(II) complexes of the 2-aminopicolineN-oxides and 2-amino-4, 6-lutidineN-oxide. Transition Met Chem 13, 45–49 (1988). https://doi.org/10.1007/BF01041498

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  • DOI: https://doi.org/10.1007/BF01041498

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