Long-Lived Nuclear Spin States in Methyl Groups and Quantum-Rotor-Induced Polarization

被引：82

作者：

Meier, Benno ^{[1
]}

Dumez, Jean-Nicolas ^{[1
]}

Stevanato, Gabriele ^{[1
]}

Hill-Cousins, Joseph T. ^{[1
]}

Roy, Soumya Singha ^{[1
]}

Hakansson, Paer ^{[1
]}

Mamone, Salvatore ^{[1
]}

Brown, Richard C. D. ^{[1
]}

Pileio, Giuseppe ^{[1
]}

Levitt, Malcolm H. ^{[1
]}

机构：

[1] Univ Southampton, Sch Chem, Southampton SO17 1BJ, Hants, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2013年 / 135卷 / 50期

基金：

欧洲研究理事会; 英国工程与自然科学研究理事会;

关键词：

SINGLET ORDER; MAGNETIC-RESONANCE; RELAXATION; NMR; SPECTROSCOPY; SYSTEMS; STORAGE; 3-SPIN; FIELD;

D O I：

10.1021/ja410432f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Substances containing rapidly rotating methyl groups may exhibit long-lived states (LLSs) in solution, with relaxation times substantially longer than the conventional spin-lattice relaxation time T-1. The states become long-lived through rapid internal rotation of the CH3 group, which imposes an approximate symmetry on the fluctuating nuclear spin interactions. In the case of very low CH3 rotational barriers, a hyperpolarized LLS is populated by thermal equilibration at liquid helium temperature. Following dissolution, cross-relaxation of the hyperpolarized LLS, induced by heteronuclear dipolar couplings, generates strongly enhanced antiphase NMR signals. This mechanism explains the NMR signal enhancements observed for C-13-gamma-picoline (Icker, M.; Berger, S. J. Magn. Reson. 2012, 219, 1-3).

引用

页码：18746 / 18749

页数：4

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