Separation of Anti-Phase Signals Due to Parahydrogen Induced Polarization via 2D Nutation NMR Spectroscopy.
Separation of Anti-Phase Signals Due to Parahydrogen Induced Polarization via 2D Nutation NMR Spectroscopy.
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通过 2D 章动 NMR 光谱分离仲氢诱导极化引起的反相位信号
DOI:
10.1002/cphc.201601227
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
M. Hunger
中科院分区:
文献类型:
--
作者:
U. Obenaus;G. Althoff-Ospelt;S. Lang;R. Himmelmann;M. Hunger
The present work introduces a novel method for the selective detection of1H NMRanti‐phase signals caused by the pairwise incorporation of parahydrogen into olefins on noble‐metal‐containing catalysts. Via a two‐dimensional (2D) nutation NMR experiment, theanti‐phase signals of hyperpolarized1H nuclei are separated due to their double nutation frequency compared to that of thermally polarized1H nuclei. For demonstrating this approach, parahydrogen induced polarization (PHIP) was achieved via the hydrogenation of propene with parahydrogen on platinum‐containing silica and investigated by in situ1H MAS NMR spectroscopy under continuous‐flow conditions, that is, the hydrogenation reaction was performed inside the magnet of the NMR spectrometer. The 2D nutation NMR experiment described in the present work is useful for the separation of overlappinganti‐phase andin‐phase signals due to hyperpolarized and thermally polarized1H nuclei, respectively, which is important for research in the field of heterogeneous catalysis.
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