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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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Supplementary files

Article information


Submitted
15 Jul 2016
Accepted
19 Aug 2016
First published
22 Aug 2016

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2017,8, 416-422
Article type
Edge Article

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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