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Separation and characterization of different signals from intermolecular three-spin orders in solution NMR

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Separation and characterization of different signals from intermolecular three-spin orders in solution NMR.htm (413bytes)
Date
2004-09
Author
Zhong Chen
陈忠
Zhi-Wei Chen
Dennis W. Hwang
Jianhui Zhong
Lian-Pin Hwang
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  • 化学化工-已发表论文 [14469]
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Abstract
In this paper, signals originating from a pure specific coherence of intermolecular three-spin orders were separated and characterized experimentally in highly polarized two-component spin systems. A modified CRAZED sequence with selective radio-frequency excitation was designed to separate the small signals from the strong conventional single-spin single-quantum signals. General theoretical expressions of the Pulse sequence with arbitrary flip angle pulses were derived using dipolar field treatment. The expressions were used to predict the relaxation and diffusion properties and optimal experimental parameters such as flip angles. For the first time, relaxation and diffusion properties Of Pure intermolecular single-quantum, double-quantum, and triple-quantum coherences of three-spin orders were characterized and analyzed in one-dimensional experiments. All experimental observations are in excellent agreement with the theoretical predictions. The theoretical results show that the quantum-mechanical treatment leads to exactly the same predictions as the dipolar field treatment. The quantitative study of intermolecular multiple-quantum coherences of three-spin orders presented herein provides a better understanding of their mechanisms. (C) 2004 Elsevier Inc. All rights reserved.
Citation
JOURNAL OF MAGNETIC RESONANCE,2004,171(2):244-252
URI
http://dx.doi.org/doi:10.1016/j.jmr.2004.08.023
https://dspace.xmu.edu.cn/handle/2288/11361

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