111140-38-6

Upstream product

• 111140-32-0 {Co(C₁₀H₁₂N₄(CH₃)2(C₆H₅)2)(CH₃CN)2}⁽²⁺⁾*2B(C₆H₅)4^(1-)={Co(C₁₀H₁₂N₄(CH₃)2(C₆H₅)2)(CH₃CN)2}(B(C₆H₅)4)2 

Relevant academic research and scientific papers

Lewis acidity of cobalt(I)

The synthesis, characterization, and reactivity of CoII complexes of the macrocycles (Chemical Equation Presented) are reported, where L = L1 when R = R′ = CH3, L = L2 when R = CH3 and R′ = Ph, and L = L5 when R = R′ = Ph. The complexes, denoted CoIIL2+, undergo unusually facile one-electron reduction by a variety of reducing agents (e.g., Na/Hg, pyridine, N-methylimidazole) to the corresponding CoI complexes in acetonitrile solvent. The Co1L+ complexes serve as potent Lewis acids toward a variety of monodentate ligands. The equilibrium constants, Keq, for adduct formation between CoL+ and the donors pyridine, 2,6-lutidine, N-methylimidazole, and Br- have been measured by spectrophotometric methods and are reported herein. In general, Keq increases with the donor ability of the monodentate ligand and with the electron-withdrawing ability of the macrocyclic ligand. A Lewis acid role for Co1, which normally functions as a potent nucleophile, is highly unusual.