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À propos de : Complexation of Co(DBF2)2 byN-Methylimidazole in Acetonitrile: FormationConstants and 1H NMR Shifts and RelaxationTimes        

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  • Complexation of Co(DBF2)2 byN-Methylimidazole in Acetonitrile: FormationConstants and 1H NMR Shifts and RelaxationTimes
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  • The complexation of Co(DBF2)2 by N-methylimidazole (MeIm) in acetonitrile has been studied by spectrophotometric titration at 0, 19, and 35 °C. The equilibrium constants K1 and K2 and their thermodynamic parameters have been determined. NMR studies of the chemical shifts and relaxation rates of the C−H protons of MeIm from −35 °C to 35 °C indicate that MeIm ligand exchange is in the fast-exchange limit. The relevance of these measurements to previous studies on related vitamin B12 models is discussed.
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