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Issue 1, 2017
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Dendritic polarizing agents for DNP SENS

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Abstract

Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) is an effective method to significantly improve solid-state NMR investigation of solid surfaces. The presence of unpaired electrons (polarizing agents) is crucial for DNP, but it has drawbacks such as leading to faster nuclear spin relaxation, or even reaction with the substrate under investigation. The latter can be a particular problem for heterogeneous catalysts. Here, we present a series of carbosilane-based dendritic polarizing agents, in which the bulky dendrimer can reduce the interaction between the solid surface and the free radical. We thereby preserve long nuclear T2 of the surface species, and even successfully enhance a reactive heterogeneous metathesis catalyst.

Graphical abstract: Dendritic polarizing agents for DNP SENS

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Publication details

The article was received on 15 Jul 2016, accepted on 19 Aug 2016 and first published on 22 Aug 2016


Article type: Edge Article
DOI: 10.1039/C6SC03139K
Citation: Chem. Sci., 2017,8, 416-422
  • Open access: Creative Commons BY license
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    Dendritic polarizing agents for DNP SENS

    W. Liao, T. Ong, D. Gajan, F. Bernada, C. Sauvée, M. Yulikov, M. Pucino, R. Schowner, M. Schwarzwälder, M. R. Buchmeiser, G. Jeschke, P. Tordo, O. Ouari, A. Lesage, L. Emsley and C. Copéret, Chem. Sci., 2017, 8, 416
    DOI: 10.1039/C6SC03139K

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