首页> 外文学位 >Solid-state NMR study of [cesium(p-tert-butylcalix[4]arene -hydrogen(methyl cyanide)] guest-host complex using rotational-echo, double resonance.
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Solid-state NMR study of [cesium(p-tert-butylcalix[4]arene -hydrogen(methyl cyanide)] guest-host complex using rotational-echo, double resonance.

机译:使用旋转回波,双共振对[铯(对叔丁基杯[4]芳烃-氢(甲基氰化物)]]客体-主体配合物进行固态NMR研究。

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Currently, there is no general accepted method for Cesium ion removal from high-level radioactive waste (HLW). Selective removal of cesium ions proves to be difficult due to the presence of high concentrations of Na + and K+ ions. An understanding of the molecular interactions that stabilize guest-host complexes may be useful in future compounds designed for trapping specific guests.; Typically, X-ray diffraction methods are used to determine structures of solids from a crystal. When it becomes difficult to grow a crystal, solid-state NMR is a good complimentary method to X-ray techniques in determining structural information of many types of materials. Rotational-Echo, Double-Resonance (REDOR) is a widely accepted structural tool used for extracting distances in solids. The results show 133Cs nucleus is contained within the calixarene. Also, 13C-2D REDOR experiments are described which may be used to aid in 13C spectral assignments of host compounds, especially when there is difficulty assigning resonances.
机译:当前,尚无普遍接受的从高放射性废物(HLW)中去除铯离子的方法。由于存在高浓度的Na + 和K + 离子,选择性去除铯离子被证明是困难的。对稳定客体-主体复合物的分子相互作用的理解可能对将来设计用于捕获特定客体的化合物很有用。通常,使用X射线衍射法确定晶体的固体结构。当难以生长晶体时,固态NMR是确定多种材料的结构信息时X射线技术的一种很好的补充方法。旋转回波双共振(REDOR)是一种广泛用于提取固体距离的结构工具。结果表明,杯盖芳烃中含有 133 Cs核。另外,还描述了 13 C-2D REDOR实验,该实验可用于辅助宿主化合物的 13 C光谱分配,尤其是在难以分配共振的情况下。

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