Chinese Journal of Magnetic Resonance >

2020 , Vol. 37 >Issue 2: 182 - 192

DOI: https://doi.org/10.11938/cjmr20192725

Articles

Preparation of Nuclear Spin Singlet States and Analysis of Influencing Factors on Their Conversion Efficiency and Lifetime

  • LIU Hui-xia ,
  • XIN Jia-xiang ,
  • WEI Da-xiu ,
  • YAO Ye-feng
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  • Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Materials Science, East China Normal University, Shanghai 200062, China

Received date: 2019-03-22

  Online published: 2019-05-13

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Abstract

The long-life nuclear spin singlet states (LLSs) have broad application prospects due to the unique nature of their long lifetime. Herein, in a solution of alanylglycylgcine (AGG), the nuclear spin singlet state of a two-spin system far from the chiral carbon in the structure is prepared. Then, the effects of sample concentration, temperature, radiofrequency (RF) center, J-coupling value and magnetic field inhomogeneity on conversion efficiency and lifetime of the LLSs were investigated. The experimental results showed that the conversion efficiency and lifetime of the singlet state were not affected by the sample concentration and magnetic field inhomogeneity, but increased with increasing experimental temperature. The influence of the position of RF center on the singlet state was not obvious when it changed within a small range, but the conversion efficiency and lifetime reduced significantly when the changes were large. Moreover, the singlet state was found to be sensitive to the changes of J-coupling value. The conversion efficiency and lifetime reduced significantly with choose of non-accurate J-coupling constant.

Key words： nuclear spin singlet state; strong-coupling system; conversion efficiency; nuclear magnetic resonance (NMR)

Cite this article

LIU Hui-xia , XIN Jia-xiang , WEI Da-xiu , YAO Ye-feng . Preparation of Nuclear Spin Singlet States and Analysis of Influencing Factors on Their Conversion Efficiency and Lifetime[J]. Chinese Journal of Magnetic Resonance, 2020 , 37(2) : 182 -192 . DOI: 10.11938/cjmr20192725

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