Investigating catalytic processes with parahydrogen: evolution of zero-quantum coherence in AA'X spin systems
Investigating catalytic processes with parahydrogen: evolution of zero-quantum coherence in AA'X spin systems
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研究仲氢催化过程：AAX 自旋系统中零量子相干性的演化
DOI：
10.1006/jmre.1998.1421
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发表时间：
1998
影响因子：
2.2
通讯作者：
Glaser
中科院分区：
文献类型：
--
作者：
Natterer;Schedletzky;Barkemeyer;Bargon;Glaser
提出了阐明寿命太短而无法用标准 NMR 方法直接检测的氢化中间体性质的系统概要。该方法利用了仲氢密度算子的特殊性及其固有的增强因子。这些实验的关键方面是仲氢密度算子中包含的零量子相干性的演化。解析相干传递函数已经被导出，它描述了自旋系统中这种零量子相干性的演化，该系统由三个自旋 1/2 组成，形成 AA'X 自旋系统。所提出的分析表达式构成了关键催化步骤彻底研究的基础。版权所有1998 学术出版社。
A systematic outline for the elucidation of the nature of hydrogenation intermediates with a lifetime too short to be directly detectable with standard NMR methods is presented. The method takes advantage of the special nature of the parahydrogen density operator and its inherent enhancement factor. The key aspect of these experiments is the evolution of zero-quantum coherence which is contained in the parahydrogen density operator. Analytical coherence transfer functions have been derived which describe the evolution of this zero-quantum coherence in spin systems consisting of three spins 1/2 that form an AA'X spin system. The analytical expressions presented form a basis for a thorough investigation of crucial catalytic steps. Copyright 1998 Academic Press.