Improved Dynamic Nuclear Polarization Surface-Enhanced NMR Spectroscopy through Controlled Incorporation of Deuterated Functional Groups

Authors


  • A.J.R. acknowledges support from a EU Marie-Curie IFF Fellowship (PIIF-GA-2010-274574). M.S. acknowledges support from SNF (SNF projeckt 200021_134775/1). Financial support is acknowledged from EQUIPEX contract ANR-10-EQPX-47-01 and ETH Zürich. We thank Dr. Olivier Ouari and Paul Tordo for providing the bCTbK radical, and Bruker Biospin for providing access to the DNP NMR spectrometer.

Abstract

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In a spin: The use of deuterated surface passivation agents is shown to restore dynamic nuclear polarization (DNP) surface-enhanced NMR signals that are reduced in substrates containing methyl groups, while still protecting sensitive sites on the surface (see picture). Furthermore, apolar groups such as [D9]-trimethylsiloxy (TMS) repel radicals (yellow) away from the surface, thus diminishing detrimental paramagnetic effects induced by radical proximity.

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