Self-assembled trityl radical capsules – implications for dynamic nuclear polarization

I. Marin-Montesinos; J. C. Paniagua; M. Vilaseca; A. Urtizberea; F. Luis; M. Feliz; F. Lin; S. Van Doorslaer; M. Pons

doi:10.1039/C4CP05225K

Self-assembled trityl radical capsules – implications for dynamic nuclear polarization†

I. Marin-Montesinos,^a J. C. Paniagua,^bc M. Vilaseca,^d A. Urtizberea,^e F. Luis,^e M. Feliz,^f F. Lin,^g S. Van Doorslaer^g and M. Pons*^a

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* Corresponding authors

^a Biomolecular NMR laboratory, Department of Organic Chemistry, University of Barcelona, Cluster Building, Barcelona Science Park, Baldiri Reixac, 10-12, 08028 Barcelona, Spain
E-mail: mpons@ub.edu

^b Department of Physical Chemistry, University of Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain

^c Institute of Theoretical and Computational Chemistry, University of Barcelona (IQTCUB), Martí i Franqués, 1-11 08028 Barcelona, Spain

^d Mass Spectrometry Core Facility, Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac, 10-12, 08028 Barcelona, Spain

^e Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain

^f Unitat de RMN, Centres Científics i Tecnològics, Universitat de Barcelona, Baldiri Reixac, 10-12, 08028 Barcelona, Spain

^g Department of Physics, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium

Abstract

A new class of guest-induced, bi-radical self-assembled organic capsules is reported. They are formed by the inclusion of a tetramethylammonium (TMA) cation between two monomers of the stable trityl radical OX63. OX63 is extensively used in dissolution dynamic nuclear polarization (DNP) where it leads to NMR sensitivity enhancements of several orders of magnitude. The supramolecular properties of OX63 have a strong impact on its DNP properties. An especially relevant case is the polarization of choline-containing metabolites, where complex formation between choline and OX63 results in faster relaxation.

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DOI: https://doi.org/10.1039/C4CP05225K
Article type: Paper
Submitted: 10 Nov 2014
Accepted: 20 Jan 2015
First published: 20 Jan 2015
This article is Open Access

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Phys. Chem. Chem. Phys., 2015,17, 5785-5794

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Self-assembled trityl radical capsules – implications for dynamic nuclear polarization

I. Marin-Montesinos, J. C. Paniagua, M. Vilaseca, A. Urtizberea, F. Luis, M. Feliz, F. Lin, S. Van Doorslaer and M. Pons, Phys. Chem. Chem. Phys., 2015, 17, 5785 DOI: 10.1039/C4CP05225K

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Physical Chemistry Chemical Physics

Self-assembled trityl radical capsules – implications for dynamic nuclear polarization†

Abstract

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Self-assembled trityl radical capsules – implications for dynamic nuclear polarization

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