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Multiplet patterns due to co-existing intermolecular dipolar and intramolecular scalar couplings in liquid nuclear magnetic resonance

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Multiplet patterns due to co-existing intermolecular dipolar and intramolecular scalar couplings in liquid nuclear magnetic resonance.pdf (303.3Kb)
Date
2005
Author
Zhu Xiao-Qin
朱小钦
Cai Cong-Bo
蔡聪波
Chen Zhong
陈忠
Zhong Jian-Hui
钟健晖
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  • 化学化工-已发表论文 [14469]
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Abstract
When both intermolecular dipolar couplings (D couplings) and intramolecular scalar couplings (J couplings) exist in a highly polarized multiple-spin liquid, some forbidden nuclear magnetic resonance signals originating from intermolecular multiple-quantum coherences may become observable. Moreover, their multiplet patterns are quite different from what are observed in a multiple-spin system with J couplings only. In this paper, these forbidden resonance peaks and unique multiplet patterns are studied theoretically and experimentally. For comparison and verification, an I2S3 + X spin system is chosen as an example to present five types of signal patterns from the interactions of D and J couplings with either selective or non-selective radio-frequency pulse sequences for double-quantum coherences. The multiplet pattern rules for a more general IpSq + X-k (p;q k = 1, 2, 3....) spin system are derived as well. It is demonstrated that some unusual multiplet amplitude patterns such as (1:0:-1) may "magnify" J splittings, allowing more accurate measurement of J coupling in the case of small J coupling constants and/or in inhomogeneous fields. It is shown that the theoretical predictions, computer simulations, and experimental observations are all in agreement with one another very well.
Citation
CHINESE PHYSICS,2005,14(3):516-523
URI
http://dx.doi.org/doi:10.1088/1009-1963/14/3/015
https://dspace.xmu.edu.cn/handle/2288/11230

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