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Issue 36, 2013
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Synthesis and structures of Co bis-trifluoromethylpyrazolate complexes

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Abstract

Reactions of Co(PMe3)3Cl or CoCl2 with 3,5-(CF3)2-PzNa in hexane give Co(PMe3)3(3,5-(CF3)2-Pz) (1) and Co(PMe3)3(3,5-(CF3)2-Pz)2 (2) respectively (3,5-(CF3)2-PzNa = sodium bis-trifluoromethylpyrazolate). Reaction of (3,5-(CF3)2-PzH) with Co(PMe3)4 produces the unusual complex [cis-Co(PMe3)4H2][Co(PMe3)(3,5-(CF3)2-Pz)3] (3) which formally contains a [Co(III)]+[Co(II)] complex ion pair. Reaction of 3,5-(CF3)2-PzLi with an oxygenated suspension of CoCl2 and 3 equivalents of PMe3 gives (3,5-(CF3)2-Pz)2Co(μ-3,5-(CF3)2-Pz)(μ-OPMe3)Li(OPMe3)2 (4), while 2 reacts with LiOH to give [(PMe3)Co(μ-3,5-(CF3)2-Pz)23-OH)Li]2 (5). Both 2 and 3 react with O2 in toluene solution to give Co(OPMe3)2(3,5-(CF3)2-Pz)2 (6). All compounds have been characterized spectroscopically and by single crystal X-ray diffraction studies.

Graphical abstract: Synthesis and structures of Co bis-trifluoromethylpyrazolate complexes

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Publication details

The article was received on 20 Mar 2013, accepted on 15 Apr 2013 and first published on 17 Apr 2013


Article type: Paper
DOI: 10.1039/C3DT50758K
Citation: Dalton Trans., 2013,42, 12898-12907
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    Synthesis and structures of Co bis-trifluoromethylpyrazolate complexes

    J. H. Rivers and R. A. Jones, Dalton Trans., 2013, 42, 12898
    DOI: 10.1039/C3DT50758K

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