论文部分内容阅读
本文应用脉冲Fourier交换核磁共振仪直接测定了若干种钴(Ⅲ)螯合物的~(59)Co-NMR谱。观察了溶剂、浓度、温度对~(59)Co谱的影响。以~(59)Co谱鉴别了螯合物的旋光和几何异构体,对于Co(±pn)_3Cl_3配合物,△(λλλ)和Λ(δδδ)峰在较低场,δ_(mer)大于δ_(fac),其次为△(λλδ)和Λ(δδλ)。分辨出Co(en)_3Cl_3从D_0至D_(12)十三个同位素异构体~(59)Co峰,每一个H/D交换使~(59)Co峰向高场移动5.4ppm,讨论了影响同位素位移方向、大小的诸因素及同位素位移的加和性,并讨论了化学平衡同位素效应。
In this paper, ~ (59) Co-NMR spectra of several cobalt (Ⅲ) chelates were directly determined by pulsed Fourier transform nuclear magnetic resonance spectroscopy. The effect of solvent, concentration and temperature on the ~ (59) Co spectrum was observed. The optical and geometrical isomers of chelates were identified by ~ (59) Co spectra. For the Co (± pn) _3Cl_3 complexes, △ (λλλ) and Λ (δδδ) δ_ (fac), followed by △ (λλδ) and Λ (δδλ). Thirteen isotope isomers of Co_ (en) _3Cl_3 from D_0 to D_ (12) were identified, each of which was shifted to ~5.4 ppm in the high field for each H / D exchange The factors influencing the direction and size of isotope displacement and the additive properties of isotopic displacements are also discussed. The chemical equilibrium isotope effect is also discussed.