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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Two-Dimensional Nuclear Magnetic Resonance: Exploiting Spin Echoes To Maximize Information Content by Suppression of Diagonal Peaks in Homonuclear Experiments
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Two-Dimensional Nuclear Magnetic Resonance: Exploiting Spin Echoes To Maximize Information Content by Suppression of Diagonal Peaks in Homonuclear Experiments

机译：二维核磁共振：利用自旋回波通过在单核实验中抑制对角峰来最大化信息含量

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摘要

Two-dimensional nuclear magnetic resonance (2D NMR) correlation spectra help visualize inter- or intra-molecular spin connectivity through space or through bonds. This is accomplished by magnetization transfer between interacting (connected) spins located at different sites in molecules. In homonuclear 2D experiments, cross peaks which demonstrate spin connectivity and result from magnetization transfer between sites are unfortunately invariably accompanied by other peaks that result from magnetization that has not undergone any transfer, viz., diagonal peaks. The latter can often mask close-lying cross peaks. We report here the general principles that constitute a design strategy for diagonal suppression, relying on echo formation. Next, a novel experiment that effects diagonal suppression in the high-resolution mode is demonstrated. Pure phase capability is also introduced. Examples from both 2D exchange and high-resolution 2D correlation spectroscopy are included, and the proposed method is compared with other established as well as recent attempts to accomplish diagonal suppression.
机译：二维核磁共振（2D NMR）相关光谱有助于可视化通过空间或通过键的分子间或分子内自旋连接性。这是通过位于分子不同位置的相互作用（连接）的自旋之间的磁化转移来实现的。在同核2D实验中，不幸的是，显示自旋连通性并由位点之间的磁化转移产生的交叉峰总是伴随着其他未经过任何转移的磁化峰，即对角峰。后者通常可以掩盖附近的交叉峰。我们在此报告依赖回波形成的构成对角线抑制设计策略的一般原理。接下来，说明了在高分辨率模式下实现对角线抑制的新颖实验。还介绍了纯相功能。包括来自2D交换和高分辨率2D相关光谱的示例，并将所提出的方法与其他已建立方法以及最近完成对角线抑制的尝试进行了比较。

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