Conformation‐dependent 13C chemical shifts: A new means of conformational characterization as obtained by high‐resolution solid‐state 13C NMR
Conformation‐dependent 13C chemical shifts: A new means of conformational characterization as obtained by high‐resolution solid‐state 13C NMR
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构象依赖性 13C 化学位移：通过高分辨率固态 13C NMR 获得构象表征的新方法
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
H. Saitô
中科院分区：
文献类型：
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作者：
H. Saitô
本文综述了近年来固体高分辨13 C NMR的研究进展，以说明各种分子体系的13 C化学位移在构象变化时是如何以及在多大程度上发生位移的。实例取自烷烃、多糖、多肽以及天然存在的和合成的离子载体的研究，其中由于结晶多晶型物或各种金属-配体相互作用，可获得多于单一的构象。构象依赖的13 C化学位移的大小在许多情况下高达8 ppm，并且与附近单键的一组扭转角密切相关。这个概念的构象表征的应用进行了讨论。
A survey of recent high‐resolution solid‐state 13C NMR studies is given to illustrate how and to what extent 13C chemical shifts of a variety of molecular systems are displaced upon conformational changes. Examples are taken from studies of alkanes, polysaccharides, polypeptides, and naturally occurring and synthetic ionophores, in which more than single conformations are available owing to either crystalline polymorphs or a variety of metal‐ligand interactions. The magnitude of the conformation‐dependent 13C chemical shifts are in many instances as large as 8 ppm and are well related to a set of torsion angles of nearby single bonds. The application of this concept to conformational characterization is also discussed.