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Issue 1, 2016
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Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization

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Abstract

A series of 37 dinitroxide biradicals have been prepared and their performance studied as polarizing agents in cross-effect DNP NMR experiments at 9.4 T and 100 K in 1,1,2,2-tetrachloroethane (TCE). We observe that in this regime the DNP performance is strongly correlated with the substituents on the polarizing agents, and electron and nuclear spin relaxation times, with longer relaxation times leading to better enhancements. We also observe that deuteration of the radicals generally leads to better DNP enhancement but with longer build-up time. One of the new radicals introduced here provides the best performance obtained so far under these conditions.

Graphical abstract: Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization

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Publication details

The article was received on 07 Aug 2015, accepted on 12 Oct 2015 and first published on 13 Oct 2015


Article type: Edge Article
DOI: 10.1039/C5SC02921J
Citation: Chem. Sci., 2016,7, 550-558
  • Open access: Creative Commons BY license
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    Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization

    D. J. Kubicki, G. Casano, M. Schwarzwälder, S. Abel, C. Sauvée, K. Ganesan, M. Yulikov, A. J. Rossini, G. Jeschke, C. Copéret, A. Lesage, P. Tordo, O. Ouari and L. Emsley, Chem. Sci., 2016, 7, 550
    DOI: 10.1039/C5SC02921J

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