Dipolar SASS NMR spectroscopy: Separation of heteronuclear dipolar powder patterns in rotating solids
Dipolar SASS NMR spectroscopy: Separation of heteronuclear dipolar powder patterns in rotating solids
复制标题
偶极 SASS NMR 波谱：旋转固体中异核偶极粉末模式的分离
DOI：
10.1063/1.450902
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发表时间：
1986
影响因子：
4.4
通讯作者：
A. Saika
中科院分区：
文献类型：
--
作者：
T. Terao;H. Miura;A. Saika
提出了用于分别获得化学上不同的核的异质偶极粉末图案的二维样品旋转NMR技术，其涉及打开和关闭魔角的旋转轴。程序的计算得到的偶极光谱由这种方法进行了描述，并讨论了使用模拟光谱的各种功能。该方法的实际应用证明了甲酸钙，β-喹啉-甲醇包合物，和尿素-反式-4-辛烯包合物的13 C光谱，提供信息的绝对符号和间接偶极耦合的大小，13 C-1H距离，和动力学的捕获分子的包合物。
Two‐dimensional sample‐spinning NMR techniques for separately obtaining heteronuclear dipolar powder patterns of chemically distinct nuclei are proposed, which involve switching the spinning axis on and off the magic angle. Procedures for the computation of dipolar spectra obtained by this method are described, and various features of such spectra are discussed using simulated spectra. Practical applications of this method are demonstrated with 13C spectra of calcium formate, β‐quinol‐methanol clathrate, and urea‐trans‐4‐octene clathrate, providing information on the absolute sign and magnitude of the indirect dipolar couplings, 13C–1H distances, and dynamics of trapped molecules in clathrates.