首页> 外文期刊>Journal of magnetic resonance >Polarization transfer from para-hydrogen to heteronuclei: Effect of H/D substitution. The Case of AA'X and A(2)A'X-2 spin systems
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Polarization transfer from para-hydrogen to heteronuclei: Effect of H/D substitution. The Case of AA'X and A(2)A'X-2 spin systems

机译:从对氢到异核的极化转移:H / D取代的影响。 A'X和A(2)A'X-2自旋系统的情况

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Upon hydrogenation from para-hydrogen (p-H-2), hyperpolarization transfer toward a heteronucleus may be possible even if the two protons are chemically equivalent in the final product (but not magnetically equivalent), provided that J couplings with the heteronucleus exist. It is however shown (theoretically and experimentally) that this transfer effectively occurs if the spin system in the hydrogenated molecule is of the type AA'X (A and A' denoting the two protons originating from p-H-2 and X the heteronucleus) but does not occur for a spin system of the AA'X type. A theory has been worked out for assessing the details of the X spectrum (multiplet patterns) in the case of ALTADENA and PASADENA experiments. Experimental verifications are provided. (c) 2005 Elsevier Inc. All rights reserved.
机译:从对氢(p-H-2)氢化后,即使最终质子中的两个质子在化学上是等价的(但不是磁等价的),也可能朝着杂核超极化转移,前提是存在与杂核的J偶联。但是(理论上和实验上)表明,如果氢化分子中的自旋系统为AA'X型(A和A'表示源自pH-2的两个质子,X为杂核的质子),则这种转移有效发生。 AA'X型自旋系统不会发生这种情况。在ALTADENA和PASADENA实验的情况下,已经设计出一种理论来评估X光谱(多重模式)的细节。提供了实验验证。 (c)2005 Elsevier Inc.保留所有权利。

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