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Studies of dynamic nuclear polarization with nitroxides in aqueous solution

机译:水溶液中氮氧化物的动态核极化研究

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The dynamic nuclear polarization effect between the nitroxide radical TEMPO and the H-1 protons of water solution was investigated at an electron pumping frequency of 9.7 GHz for different experimental conditions. In particular, we compared N-14-4-hydroxy-TEMPO (TEMPOL) with 4-oxo-TEMPO and evaluated the effect of H-2 and N-15 isotope labelling. Furthermore, we tested the effect of concomitant irradiation on both electron paramagnetic resonance (EPR) lines with the N-15-labelled compound. Our results show that the reduction in the EPR line width given by the H-1 and N-15 labelling and the collapse in the number of hyperfine lines due to N-15 substitution leads to the highest enhancement of epsilon = -140 ever reported in the literature. Concomitant pumping on two hyperfine lines does not give higher enhancements at our experimental conditions.
机译:在不同实验条件下,在9.7 GHz电子泵浦频率下研究了硝基自由基TEMPO和水溶液的H-1质子之间的动态核极化效应。特别是,我们将N-14-4-羟基-TEMPO(TEMPOL)与4-氧代-TEMPO进行了比较,并评估了H-2和N-15同位素标记的效果。此外,我们测试了同时照射对带有N-15标记化合物的两个电子顺磁共振(EPR)线的影响。我们的结果表明,由H-1和N-15标记导致的EPR线宽度的减少以及由于N-15取代而导致的超细线数量的减少导致有史以来最大的ε= -140增强。文献。在我们的实验条件下,同时在两条超细管线上进行泵送不会产生更高的增强效果。

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