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摘要翻译
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A series of square-planar cobalt(II) complexes with pincer ligands {N(CH2CH2PtBu2)2}− ({L1tBu}− , {N-(CH2CH2PtBu2)(CHCHPtBu2)}− ({L2tBu}−, and {N-(CHCHPtBu2)2}− ({L3tBu}− was synthesized. Ligand dehydrogenation was accomplished with a new, high-yield protocol thatemploys the 2,4,6-tri-tert-butylphenoxy radical as hydrogen acceptor.[CoCl{LntBu}] (n = 1−3) were examined with respect to reduction, protonation, and oxidation, respectively. One-electron oxidations of [CoCl(L1tBu)] and [CoCl(L2tBu)] lead to ligand-centered radical reactivity, like amide disproportionation into cobalt(II) amine and imine complexes. In contrast, oxidation of [CoCl{L3 tBu}] with Ag+ enabled the isolation of thermally stable, square-planar cobalt(III) complex [CoCl{L3tBu}]+, which adopts an intermediate-spin (S = 1) ground state with large magnetic anisotropy. Hence, pincer dehydrogenation gives access to a new platform for high-valent cobalt in square-planar geometry. 配体不用翻译，谢谢 |
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