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Issue 33, 2017
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Polarization transfer efficiency in PHIP experiments

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Abstract

Parahydrogen induced polarization (PHIP) is a hyperpolarization method for NMR signal enhancement with applications in spectroscopy and imaging. Although parahydrogen can be easily enriched up to nearly 95%, the polarization detected on the hydrogenated substrate is substantially lower, where numerous loss mechanisms between the start of the hydrogenation reaction and detection affect polarization levels. The quality of PHIP systems is commonly determined by stating either the polarization degree or the enhancement factor of the product at the time of detection. In this study, we present a method that allows the distinction of polarization loss due to both the catalytic cycle and T1 relaxation of the formed product prior to detection. We determine the influence of homogeneous catalysts and define a rigorous measure of the polarization transfer efficiency (PTE). Our results show that the PTE strongly depends on the concentration of all components and the chemical structure of the catalyst as well as on the magnetic field of detection.

Graphical abstract: Polarization transfer efficiency in PHIP experiments

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Publication details

The article was received on 26 Jun 2017, accepted on 31 Jul 2017 and first published on 01 Aug 2017


Article type: Communication
DOI: 10.1039/C7CP04296E
Citation: Phys. Chem. Chem. Phys., 2017,19, 21933-21937
  • Open access: Creative Commons BY license
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    Polarization transfer efficiency in PHIP experiments

    M. Emondts, J. F. P. Colell, B. Blümich and P. P. M. Schleker, Phys. Chem. Chem. Phys., 2017, 19, 21933
    DOI: 10.1039/C7CP04296E

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