ANISOTROPIC MOLECULAR-REORIENTATION MEASURED BY NMR RELAXATION INCLUDING CROSS TERMS BETWEEN DIPOLAR AND CHEMICAL-SHIFT ANISOTROPY INTERACTIONS
ANISOTROPIC MOLECULAR-REORIENTATION MEASURED BY NMR RELAXATION INCLUDING CROSS TERMS BETWEEN DIPOLAR AND CHEMICAL-SHIFT ANISOTROPY INTERACTIONS
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DOI：
10.1063/1.449273
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发表时间：
1985-01-01
影响因子：
4.4
通讯作者：
STERK, H
中科院分区：
文献类型：
--
作者：
KONIGSBERGER, E;STERK, H
将证明质子化芳族 13C 核的化学位移各向异性 (CSA) 弛豫机制决不可忽略。五氯苯自然丰度 13C-H 自旋系统中偶极和 CSA 相互作用产生的互相关谱密度包含在分子运动各向异性的完整测定中。此外，间接耦合常数 1JCH 的绝对符号显示为正。
It will be demonstrated that the chemical shift anisotropy (CSA) relaxation mechanism for protonated aromatic 13C nuclei is by no means negligible. The cross correlation spectral density arising from dipolar and CSA interactions in the natural abundance 13C–H spin system of pentachlorobenzene is included in the complete determination of the molecular motional anisotropy. Additionally, the absolute sign of the indirect coupling constant 1JCH is shown to be positive.