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Issue 33, 2012
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The efficiency of DPPH as a polarising agent for DNP-NMR spectroscopy

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Abstract

The free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) was tested as a polarising agent for fast dissolution dynamic nuclear polarisation (DNP) NMR spectroscopy. DPPH was found to be reasonably soluble in sulfolane and the optimum concentration for DNP is 20–40 mM depending upon whether short polarisation times or the maximum signal intensity is needed. W-band ESR measurements revealed that the ESR linewidth D of DPPH is intermediate between that of BDPA and 4-oxo-TEMPO. Several thousand-fold NMR signal enhancements in the liquid-state were achieved for 13C, 15N, 89Y, and 109Ag compounds, demonstrating that DPPH can be added to the list of polarising agents for DNP-NMR spectroscopy. Furthermore, the hydrophobic DPPH free radical can be easily filtered out from the dissolution liquid when water is used as the dissolution solvent.

Graphical abstract: The efficiency of DPPH as a polarising agent for DNP-NMR spectroscopy

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Publication details

The article was received on 17 Aug 2012, accepted on 24 Oct 2012 and first published on 25 Oct 2012


Article type: Paper
DOI: 10.1039/C2RA21853D
Citation: RSC Adv., 2012,2, 12812-12817
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    The efficiency of DPPH as a polarising agent for DNP-NMR spectroscopy

    L. Lumata, M. Merritt, C. Khemtong, S. J. Ratnakar, J. van Tol, L. Yu, L. Song and Z. Kovacs, RSC Adv., 2012, 2, 12812
    DOI: 10.1039/C2RA21853D

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