Cobalt(II) complexes of the 2-aminopicoline N-oxides and 2-amino-4,6-lutidine N-oxide

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