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The synthesis and characterization of two Co(II) complexes stabilized by NCN pincer ligands are described. The paramagnetic Co(II) complex [Co(κ 3 NCN- NCN CH2 - i Pr)Br] is obtained via a transmetalation protocol from CoBr 2 and NC(C–Br)N CH2 - i Pr in THF. Surprisingly, the dinuclear complex [Co 2 (κ 3 NCN -μ 2 -NCN CH2 - i Pr)(μ-Cl)(Cl) 2 ] was synthesized following the same synthetic protocol but using an ultrasonicated CoCl 2 suspension instead of CoBr 2 in the same solvent. Both complexes are paramagnetic species exhibiting solution magnetic moments of 1.9(1) and 5.8(3) μ B , respectively. This corresponds to low-spin and high-spin d 7 configurations featuring one and three unpaired electrons at the metal centers. X-ray structures of both complexes are presented.
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Käfer et al. (2024) studied this question.
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