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Milani J, Saenz F, Roussel C, Ansermet JP. Heterogeneous Overhauser-DNP on 1 H dominated by scalar coupling in aqueous solution. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2023; 61:180-183. [PMID: 36269065 DOI: 10.1002/mrc.5321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 10/01/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
The Overhauser Dynamic Nuclear Polarization (O-DNP) of 1 H nuclei usually involves a dipolar coupling with the polarizing agent, whereas scalar coupling via hyperfine interactions are more common with 13 C nuclei. Here, we show a scalar-coupling dominated 1 H O-DNP, using polyaniline as a heterogeneous polarizing agent in an aqueous solution.
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Affiliation(s)
- Jonas Milani
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Felipe Saenz
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Christophe Roussel
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
- Section of Chemistry and Chemical Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Jean-Philippe Ansermet
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
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2
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Poryvaev AS, Gjuzi E, Yazikova AA, Polyukhov DM, Albrekht YN, Efremov AA, Kudriavykh NA, Yanshole VV, Hoffmann F, Fröba M, Fedin MV. Blatter Radical-Decorated Silica as a Prospective Adsorbent for Selective NO Capture from Air. ACS APPLIED MATERIALS & INTERFACES 2023; 15:5191-5197. [PMID: 36652301 DOI: 10.1021/acsami.2c19183] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Nitrogen oxides are adverse poisonous gases present in the atmosphere and having detrimental effects on the human health and environment. In this work, we propose a new type of mesoporous materials capable of capturing nitrogen monoxide (NO) from air. The designed material combines the robust Santa Barbara Amorphous-15 silica scaffold and ultrastable Blatter-type radicals acting as NO traps. Using in situ electron paramagnetic resonance spectroscopy, we demonstrate that NO capture from air is selective and reversible at practical conditions, thus making Blatter radical-decorated silica highly promising for environmental applications.
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Affiliation(s)
- Artem S Poryvaev
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
| | - Eva Gjuzi
- Institute of Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Anastasiya A Yazikova
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
| | - Daniil M Polyukhov
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
| | - Yana N Albrekht
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
| | - Aleksandr A Efremov
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
| | | | - Vadim V Yanshole
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
| | - Frank Hoffmann
- Institute of Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Michael Fröba
- Institute of Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Matvey V Fedin
- International Tomography Center SB RAS, Institutskaya Street 3a, Novosibirsk, 630090, Russia
- Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
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3
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Negroni M, Turhan E, Kress T, Ceillier M, Jannin S, Kurzbach D. Frémy’s Salt as a Low-Persistence Hyperpolarization Agent: Efficient Dynamic Nuclear Polarization Plus Rapid Radical Scavenging. J Am Chem Soc 2022; 144:20680-20686. [PMID: 36322908 PMCID: PMC9673139 DOI: 10.1021/jacs.2c07960] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
![]()
Nuclear magnetic resonance (NMR) spectroscopy is a key
technique
for molecular structure determination in solution. However, due to
its low sensitivity, many efforts have been made to improve signal
strengths and reduce the required substrate amounts. In this regard,
dissolution dynamic nuclear polarization (DDNP) is a versatile approach
as signal enhancements of over 10 000-fold are achievable.
Samples are signal-enhanced ex situ by transferring
electronic polarization from radicals to nuclear spins before dissolving
and shuttling the boosted sample to an NMR spectrometer for detection.
However, the applicability of DDNP suffers from one major drawback,
namely, paramagnetic relaxation enhancements (PREs) that critically
reduce relaxation times due to the codissolved radicals. PREs are
the primary source of polarization losses canceling the signal improvements
obtained by DNP. We solve this problem by using potassium nitrosodisulfonate
(Frémy’s salt) as polarization agent (PA), which provides
high nuclear spin polarization and allows for rapid scavenging under
mild reducing conditions. We demonstrate the potential of Frémy’s
salt, (i) showing that both 1H and 13C polarization
of ∼30% can be achieved and (ii) describing a hybrid sample
shuttling system (HySSS) that can be used with any DDNP/NMR combination
to remove the PA before NMR detection. This gadget mixes the hyperpolarized
solution with a radical scavenger and injects it into an NMR tube,
providing, within a few seconds, quantitatively radical-free, highly
polarized solutions. The cost efficiency and broad availability of
Frémy’s salt might facilitate the use of DDNP in many
fields of research.
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Affiliation(s)
- Mattia Negroni
- Faculty of Chemistry, Institute of Biological Chemistry, University Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Ertan Turhan
- Faculty of Chemistry, Institute of Biological Chemistry, University Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Thomas Kress
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, U.K
| | - Morgan Ceillier
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs (UMR 5082) Université de Lyon/CNRS/Université Claude Bernard Lyon 1/ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Sami Jannin
- Centre de Résonance Magnétique Nucléaire à Très Hauts Champs (UMR 5082) Université de Lyon/CNRS/Université Claude Bernard Lyon 1/ENS de Lyon, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Dennis Kurzbach
- Faculty of Chemistry, Institute of Biological Chemistry, University Vienna, Währinger Straße 38, 1090 Vienna, Austria
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4
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Perras FA, Flesariu DF, Southern SA, Nicolaides C, Bazak JD, Washton NM, Trypiniotis T, Constantinides CP, Koutentis PA. Methyl-Driven Overhauser Dynamic Nuclear Polarization. J Phys Chem Lett 2022; 13:4000-4006. [PMID: 35482607 DOI: 10.1021/acs.jpclett.2c00748] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The Overhauser effect is unique among DNP mechanisms in that it requires the modulation of the electron-nuclear hyperfine interactions. While it dominates DNP in liquids and metals, where unpaired electrons are highly mobile, Overhauser DNP is possible in insulating solids if rapid structural modulations are linked to a modulation in hyperfine coupling. Herein, we report that Overhauser DNP can be triggered by the strategic addition of a methyl group, demonstrated here in a Blatter's radical. The rotation of the methyl group leads to a modulation of the hyperfine coupling to its protons, which in turn facilitates electron-nuclear cross-relaxation. Removal of the methyl protons, through deuteration, quenches the process, as does the reduction of the hyperfine coupling strength. This result suggests the possibility for the design of tailor-made Overhauser DNP polarizing agents for high-field MAS-DNP.
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Affiliation(s)
| | - Dragos F Flesariu
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | | | | | - J David Bazak
- Physical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Nancy M Washton
- Physical & Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | | | - Christos P Constantinides
- Department of Natural Sciences, University of Michigan-Dearborn, 4901 Evergreen Road, Dearborn, Michigan 48128-1491, United States
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