论文部分内容阅读
The ~(59)Co-NMR spectra of several cobalt (Ⅲ) complexes have been directly recorded bypulsed Fourier transform nuclear magnetic resonance (FT-NMR) technique. The influences ofsolvents, concentration and temperature on ~(59)Co spectra have been investigated. Optical andgeometric isomers of the chelate complexes have been distinguished by ~(59)Co-NMR spectra. ForCo(±pn)_3Cl_3, the resonances of Δ(λλλ) and Δ(δδδ) appeared at the lower field, the δ_(mer) beinggreater than δ_(fac), followed by the peaks of Δ(λλδ) and Δ(δδλ). For Co(en)_3Cl_3-D_n, all the13 isotopic isomers, from D_0 to D_(12), have been resolved in their ~(59)Co spectra. Each H/Dexchange causes ~(59)Co peaks to move upfield 5.4 ppm. The factors affecting the direction andmagnitude of isotopic shift and its additivity have been discussed. Chemical equilibrium isotopiceffect has also been studied.
The influences of solids, concentration and temperature on ~ (59) Co spectra of several cobalt (Ⅲ) complexes have been directly recorded by pulsed Fourier transform nuclear magnetic resonance (FT-NMR) technique. For the diffraction of Co (superscript p) _3Cl_3, the resonances of Δ (λλλ) and Δ (δδδ) have been at the lower field, the δ_ (mer) Forg (en) _3Cl_3-D_n, all the13 is isotopic isomers, from D_0 to D_ (12), have been resolved in their Each H / Dexchange causes ~ (59) Co peaks to move upfield 5.4 ppm. The factors affecting the direction and magnitude of isotopic shift and its additivity have been discussed. Chemical equilibrium isotopiceffect has also been studied.