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Issue 45, 2016, Issue in Progress
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The effect of glassing solvent deuteration and Gd3+ doping on 13C DNP at 5 T

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Abstract

We report the influence of glassing solvent deuteration and Gd3+ doping on 13C dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) performed on [1-13C] sodium acetate at B0 = 5 T and 1.2 K. Our data reveal that at 5 T, glassing solvent deuteration still results in a 40% improvement of the 13C DNP signal when a large electron spin resonance (ESR) linewidth 4-oxo-TEMPO free radical is used, but results in a 60% decrease of the DNP signal in the case of a sample doped with small ESR linewidth trityl OX063. An addition of a trace amount of the Gd3+ complex Gd–HP–DO3A led to a negligible slight decrease on the 13C polarization TEMPO-doped sample, but is still relatively beneficial for the trityl-doped sample with 30% improvement of the DNP-enhanced 13C polarization. These findings indicate that while these DNP optimization steps are still valid at 5 T, the effects are not as pronounced as observed in 13C DNP at B0 = 3.35 T. These DNP results at 5 T are discussed thermodynamically within the framework of the thermal mixing model of DNP.

Graphical abstract: The effect of glassing solvent deuteration and Gd3+ doping on 13C DNP at 5 T

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Publication details

The article was received on 31 Jan 2016, accepted on 11 Apr 2016 and first published on 14 Apr 2016


Article type: Paper
DOI: 10.1039/C6RA02864K
Citation: RSC Adv., 2016,6, 38855-38860
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    The effect of glassing solvent deuteration and Gd3+ doping on 13C DNP at 5 T

    A. Kiswandhi, B. Lama, P. Niedbalski, M. Goderya, J. Long and L. Lumata, RSC Adv., 2016, 6, 38855
    DOI: 10.1039/C6RA02864K

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