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:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
M. Hunger
M. Hunger
中科院分区:
--
文献类型:
--
作者:
U. Obenaus;G. Althoff-Ospelt;S. Lang;R. Himmelmann;M. Hunger

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本工作介绍了一种新的方法,用于选择性检测1H NMR反相信号所造成的成对引入仲氢到烯烃上的贵金属催化剂。 通过二维章动核磁共振实验,由于超极化氢核的章动频率比热极化氢核的章动频率高出一倍,因此超极化氢核的反相信号被分离.为了证明这种方法,仲氢诱导极化(PHIP)是通过在含铂二氧化硅上用仲氢氢化丙烯来实现的,并在连续流动条件下通过原位1H MAS NMR光谱进行研究,即氢化反应在NMR光谱仪的磁体内进行。本文描述的2D章动NMR实验可用于分离超极化和热极化1H核的反相和同相信号,这对多相催化领域的研究具有重要意义。
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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