51
|
Mentink-Vigier F, Akbey Ü, Oschkinat H, Vega S, Feintuch A. Theoretical aspects of Magic Angle Spinning - Dynamic Nuclear Polarization. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 258:102-20. [PMID: 26232770 DOI: 10.1016/j.jmr.2015.07.001] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 07/01/2015] [Accepted: 07/04/2015] [Indexed: 05/06/2023]
Abstract
Magic Angle Spinning (MAS) combined with Dynamic Nuclear Polarization (DNP) has been proven in recent years to be a very powerful method for increasing solid-state NMR signals. Since the advent of biradicals such as TOTAPOL to increase the nuclear polarization new classes of radicals, with larger molecular weight and/or different spin properties have been developed. These have led to unprecedented signal gain, with varying results for different experimental parameters, in particular the microwave irradiation strength, the static field, and the spinning frequency. Recently it has been demonstrated that sample spinning imposes DNP enhancement processes that differ from the active DNP mechanism in static samples as upon sample spinning the DNP enhancements are the results of energy level anticrossings occurring periodically during each rotor cycle. In this work we present experimental results with regards to the MAS frequency dependence of the DNP enhancement profiles of four nitroxide-based radicals at two different sets of temperature, 110 and 160K. In fact, different magnitudes of reduction in enhancement are observed with increasing spinning frequency. Our simulation code for calculating MAS-DNP powder enhancements of small model spin systems has been improved to extend our studies of the influence of the interaction and relaxation parameters on powder enhancements. To achieve a better understanding we simulated the spin dynamics of a single three-spin system {ea-eb-n} during its steady state rotor periods and used the Landau-Zener formula to characterize the influence of the different anti-crossings on the polarizations of the system and their necessary action for reaching steady state conditions together with spin relaxation processes. Based on these model calculations we demonstrate that the maximum steady state nuclear polarization cannot become larger than the maximum polarization difference between the two electrons during the steady state rotor cycle. This study also shows the complexity of the MAS-DNP process and therefore the necessity to rely on numerical simulations for understanding parametric dependencies of the enhancements. Finally an extension of the spin system up to five spins allowed us to probe the first steps of the transfer of polarization from the nuclei coupled to the electrons to further away nuclei, demonstrating a decrease in the spin-diffusion barrier under MAS conditions.
Collapse
Affiliation(s)
| | - Ümit Akbey
- Leibniz-Institut für Molekulare Pharmakologie (FMP), NMR Supported Structural Biology, Robert Roessle Str. 10, 13125 Berlin, Germany; Aarhus Institute of Advanced Studies (AIAS), Aarhus University, Høegh-Guldbergs Gade 6B, Building: 1630, Room: 106, 8000 Aarhus C, Denmark; Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - Hartmut Oschkinat
- Leibniz-Institut für Molekulare Pharmakologie (FMP), NMR Supported Structural Biology, Robert Roessle Str. 10, 13125 Berlin, Germany
| | - Shimon Vega
- Chemical Physics Department, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Akiva Feintuch
- Chemical Physics Department, Weizmann Institute of Science, 76100 Rehovot, Israel
| |
Collapse
|
52
|
Hansen MR, Graf R, Spiess HW. Interplay of Structure and Dynamics in Functional Macromolecular and Supramolecular Systems As Revealed by Magnetic Resonance Spectroscopy. Chem Rev 2015; 116:1272-308. [DOI: 10.1021/acs.chemrev.5b00258] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Michael Ryan Hansen
- Max Planck Institute for Polymer Research, P.O. Box 3148, 55021 Mainz, Germany
| | - Robert Graf
- Max Planck Institute for Polymer Research, P.O. Box 3148, 55021 Mainz, Germany
| | | |
Collapse
|
53
|
Valla M, Rossini A, Caillot M, Chizallet C, Raybaud P, Digne M, Chaumonnot A, Lesage A, Emsley L, van Bokhoven JA, Copéret C. Atomic Description of the Interface between Silica and Alumina in Aluminosilicates through Dynamic Nuclear Polarization Surface-Enhanced NMR Spectroscopy and First-Principles Calculations. J Am Chem Soc 2015; 137:10710-9. [PMID: 26244620 PMCID: PMC4671101 DOI: 10.1021/jacs.5b06134] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Indexed: 02/07/2023]
Abstract
Despite the widespread use of amorphous aluminosilicates (ASA) in various industrial catalysts, the nature of the interface between silica and alumina and the atomic structure of the catalytically active sites are still subject to debate. Here, by the use of dynamic nuclear polarization surface enhanced NMR spectroscopy (DNP SENS) and density functional theory (DFT) calculations, we show that on silica and alumina surfaces, molecular aluminum and silicon precursors are, respectively, preferentially grafted on sites that enable the formation of Al(IV) and Si(IV) interfacial sites. We also link the genesis of Brønsted acidity to the surface coverage of aluminum and silicon on silica and alumina, respectively.
Collapse
Affiliation(s)
- Maxence Valla
- Department
of Chemistry and Applied Biosciences, Laboratory of Inorganic Chemistry, ETH Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland
| | - Aaron
J. Rossini
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Maxime Caillot
- Department
of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- IFP
Energies nouvelles, Rond-point
de l’échangeur de Solaize, BP 3, 69360 Solaize, France
| | - Céline Chizallet
- IFP
Energies nouvelles, Rond-point
de l’échangeur de Solaize, BP 3, 69360 Solaize, France
| | - Pascal Raybaud
- IFP
Energies nouvelles, Rond-point
de l’échangeur de Solaize, BP 3, 69360 Solaize, France
| | - Mathieu Digne
- IFP
Energies nouvelles, Rond-point
de l’échangeur de Solaize, BP 3, 69360 Solaize, France
| | - Alexandra Chaumonnot
- IFP
Energies nouvelles, Rond-point
de l’échangeur de Solaize, BP 3, 69360 Solaize, France
| | - Anne Lesage
- Centre de
RMN à Très Hauts Champs, Institut de Sciences Analytiques
(CNRS/ENS Lyon/UCB Lyon 1), Université
de Lyon, 69100 Villeurbanne, France
| | - Lyndon Emsley
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Jeroen A. van Bokhoven
- Department
of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Paul
Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Christophe Copéret
- Department
of Chemistry and Applied Biosciences, Laboratory of Inorganic Chemistry, ETH Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland
| |
Collapse
|
54
|
Mentink-Vigier F, Paul S, Lee D, Feintuch A, Hediger S, Vega S, De Paëpe G. Nuclear depolarization and absolute sensitivity in magic-angle spinning cross effect dynamic nuclear polarization. Phys Chem Chem Phys 2015; 17:21824-36. [PMID: 26235749 DOI: 10.1039/c5cp03457d] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Over the last two decades solid state Nuclear Magnetic Resonance has witnessed a breakthrough in increasing the nuclear polarization, and thus experimental sensitivity, with the advent of Magic Angle Spinning Dynamic Nuclear Polarization (MAS-DNP). To enhance the nuclear polarization of protons, exogenous nitroxide biradicals such as TOTAPOL or AMUPOL are routinely used. Their efficiency is usually assessed as the ratio between the NMR signal intensity in the presence and the absence of microwave irradiation εon/off. While TOTAPOL delivers an enhancement εon/off of about 60 on a model sample, the more recent AMUPOL is more efficient: >200 at 100 K. Such a comparison is valid as long as the signal measured in the absence of microwaves is merely the Boltzmann polarization and is not affected by the spinning of the sample. However, recent MAS-DNP studies at 25 K by Thurber and Tycko (2014) have demonstrated that the presence of nitroxide biradicals combined with sample spinning can lead to a depolarized nuclear state, below the Boltzmann polarization. In this work we demonstrate that TOTAPOL and AMUPOL both lead to observable depolarization at ≈110 K, and that the magnitude of this depolarization is radical dependent. Compared to the static sample, TOTAPOL and AMUPOL lead, respectively, to nuclear polarization losses of up to 20% and 60% at a 10 kHz MAS frequency, while Trityl OX63 does not depolarize at all. This experimental work is analyzed using a theoretical model that explains how the depolarization process works under MAS and gives new insights into the DNP mechanism and into the spin parameters, which are relevant for the efficiency of a biradical. In light of these results, the outstanding performance of AMUPOL must be revised and we propose a new method to assess the polarization gain for future radicals.
Collapse
|
55
|
Sangodkar RP, Smith BJ, Gajan D, Rossini AJ, Roberts LR, Funkhouser GP, Lesage A, Emsley L, Chmelka BF. Influences of Dilute Organic Adsorbates on the Hydration of Low-Surface-Area Silicates. J Am Chem Soc 2015; 137:8096-112. [DOI: 10.1021/jacs.5b00622] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Rahul P. Sangodkar
- Department
of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Benjamin J. Smith
- Department
of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - David Gajan
- Centre
de RMN à Très Hauts Champs, Institut de Sciences Analytiques
(CNRS/ENS Lyon/UCB Lyon 1), Université de Lyon, 69100 Villeurbanne, France
| | - Aaron J. Rossini
- Centre
de RMN à Très Hauts Champs, Institut de Sciences Analytiques
(CNRS/ENS Lyon/UCB Lyon 1), Université de Lyon, 69100 Villeurbanne, France
| | - Lawrence R. Roberts
- Roberts Consulting Group, 44
Windsor Avenue, Acton, Massachusetts 01720, United States
| | - Gary P. Funkhouser
- Halliburton, 3000 North
Sam Houston Parkway East, Houston, Texas 77032, United States
| | - Anne Lesage
- Centre
de RMN à Très Hauts Champs, Institut de Sciences Analytiques
(CNRS/ENS Lyon/UCB Lyon 1), Université de Lyon, 69100 Villeurbanne, France
| | - Lyndon Emsley
- Centre
de RMN à Très Hauts Champs, Institut de Sciences Analytiques
(CNRS/ENS Lyon/UCB Lyon 1), Université de Lyon, 69100 Villeurbanne, France
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Bradley F. Chmelka
- Department
of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| |
Collapse
|
56
|
Le D, Ziarelli F, Phan TNT, Mollica G, Thureau P, Aussenac F, Ouari O, Gigmes D, Tordo P, Viel S. Up to 100% Improvement in Dynamic Nuclear Polarization Solid-State NMR Sensitivity Enhancement of Polymers by Removing Oxygen. Macromol Rapid Commun 2015; 36:1416-21. [DOI: 10.1002/marc.201500133] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 04/23/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Dao Le
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Fabio Ziarelli
- Aix-Marseille Université; CNRS, Centrale Marseille; Fédération des Sciences Chimiques (FR 1739); 13397 Marseille cedex 20 France
| | - Trang N. T. Phan
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Giulia Mollica
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Pierre Thureau
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | | | - Olivier Ouari
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Didier Gigmes
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Paul Tordo
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Stéphane Viel
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| |
Collapse
|
57
|
Lee D, Hediger S, De Paëpe G. Is solid-state NMR enhanced by dynamic nuclear polarization? SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 66-67:6-20. [PMID: 25779337 DOI: 10.1016/j.ssnmr.2015.01.003] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 01/27/2015] [Accepted: 01/28/2015] [Indexed: 05/03/2023]
Abstract
The recent trend of high-field (~5-20 T), low-temperature (~100 K) ssNMR combined with dynamic nuclear polarization (DNP) under magic angle spinning (MAS) conditions is analyzed. A brief overview of the current theory of hyperpolarization for so-called MAS-DNP experiments is given, along with various reasons why the DNP-enhancement, the ratio of the NMR signal intensities obtained in the presence and absence of microwave irradiation suitable for hyperpolarization, should not be used alone to gauge the value of performing MAS-DNP experiments relative to conventional ssNMR. This is demonstrated through a dissection of the current conditions required for MAS-DNP with particular attention to resulting absolute sensitivities and spectral resolution. Consequently, sample preparation methods specifically avoiding the surplus of glass-forming solvents so as to improve the absolute sensitivity and resolution are discussed, as are samples that are intrinsically pertinent for MAS-DNP studies (high surface area, amorphous, and porous). Owing to their pertinence, examples of recent applications on these types of samples where chemically-relevant information has been obtained that would have been impossible without the sensitivity increases bestowed by MAS-DNP are also detailed. Additionally, a promising further implementation for MAS-DNP is exampled, whereby the sensitivity improvements shown for (correlation) spectroscopy of nuclei at low natural isotopic abundance, facilitate internuclear distance measurements, especially for long distances (absence of dipolar truncation). Finally, we give some speculative perspectives for MAS-DNP.
Collapse
Affiliation(s)
- Daniel Lee
- Univ. Grenoble Alpes, INAC, SCIB, F-38000 Grenoble, France; CEA, INAC, SCIB, F-38000 Grenoble, France.
| | - Sabine Hediger
- Univ. Grenoble Alpes, INAC, SCIB, F-38000 Grenoble, France; CEA, INAC, SCIB, F-38000 Grenoble, France; CNRS, SCIB, F-38000 Grenoble, France
| | - Gaël De Paëpe
- Univ. Grenoble Alpes, INAC, SCIB, F-38000 Grenoble, France; CEA, INAC, SCIB, F-38000 Grenoble, France
| |
Collapse
|
58
|
Mollica G, Dekhil M, Ziarelli F, Thureau P, Viel S. Quantitative Structural Constraints for Organic Powders at Natural Isotopic Abundance Using Dynamic Nuclear Polarization Solid-State NMR Spectroscopy. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501172] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
59
|
Mollica G, Dekhil M, Ziarelli F, Thureau P, Viel S. Quantitative structural constraints for organic powders at natural isotopic abundance using dynamic nuclear polarization solid-state NMR spectroscopy. Angew Chem Int Ed Engl 2015; 54:6028-31. [PMID: 25809550 DOI: 10.1002/anie.201501172] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Indexed: 11/06/2022]
Abstract
A straightforward method is reported to quantitatively relate structural constraints based on (13)C-(13)C double-quantum build-up curves obtained by dynamic nuclear polarization (DNP) solid-state NMR to the crystal structure of organic powders at natural isotopic abundance. This method relies on the significant gain in NMR sensitivity provided by DNP (approximately 50-fold, lowering the experimental time from a few years to a few days), and is sensitive to the molecular conformation and crystal packing of the studied powder sample (in this case theophylline). This method allows trial crystal structures to be rapidly and effectively discriminated, and paves the way to three-dimensional structure elucidation of powders through combination with powder X-ray diffraction, crystal-structure prediction, and density functional theory computation of NMR chemical shifts.
Collapse
Affiliation(s)
- Giulia Mollica
- Aix-Marseille Université, CNRS, ICR (UMR 7273), 13397 Marseille cedex 20 (France)
| | | | | | | | | |
Collapse
|
60
|
Neudert O, Reh M, Spiess HW, Münnemann K. X-Band DNP Hyperpolarization of Viscous Liquids and Polymer Melts. Macromol Rapid Commun 2015; 36:885-9. [DOI: 10.1002/marc.201500036] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 02/13/2015] [Indexed: 01/10/2023]
Affiliation(s)
- Oliver Neudert
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Miriam Reh
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Hans W. Spiess
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Kerstin Münnemann
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| |
Collapse
|
61
|
Parambil JV, Poornachary SK, Hinder SJ, Tan RBH, Heng JYY. Establishing template-induced polymorphic domains for API crystallisation: the case of carbamazepine. CrystEngComm 2015. [DOI: 10.1039/c5ce01080b] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Template-induced nucleation of the model compound, Carbamazepine (CBZ), on substrates with different surface chemistries was studied.
Collapse
Affiliation(s)
- Jose V. Parambil
- Surfaces and Particle Engineering Laboratory
- Department of Chemical Engineering
- Imperial College London
- South Kensington Campus
- London SW7 2AZ, UK
| | - Sendhil K. Poornachary
- Institute of Chemical and Engineering Sciences
- A*STAR (Agency for Science, Technology and Research)
- , Singapore 627833
| | - Steven J. Hinder
- The Surface Analysis Laboratory
- Faculty of Engineering & Physical Sciences
- University of Surrey
- Guildford, UK
| | - Reginald B. H. Tan
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- , Singapore 117585
- Institute of Chemical and Engineering Sciences
- A*STAR (Agency for Science, Technology and Research)
| | - Jerry Y. Y. Heng
- Surfaces and Particle Engineering Laboratory
- Department of Chemical Engineering
- Imperial College London
- South Kensington Campus
- London SW7 2AZ, UK
| |
Collapse
|
62
|
Zhao L, Li W, Plog A, Xu Y, Buntkowsky G, Gutmann T, Zhang K. Multi-responsive cellulose nanocrystal–rhodamine conjugates: an advanced structure study by solid-state dynamic nuclear polarization (DNP) NMR. Phys Chem Chem Phys 2014; 16:26322-9. [DOI: 10.1039/c4cp04096a] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Monitoring stimuli-responsive cellulose nanocrystals with surface-attached rhodamine spiroamide of low amount using DNP-enhanced ssNMR spectroscopy.
Collapse
Affiliation(s)
- Li Zhao
- Eduard-Zintl-Institute for Inorganic Chemistry and Physical Chemistry
- Technical University Darmstadt
- D-64287 Darmstadt, Germany
| | - Wei Li
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Science
- Technical University Darmstadt
- 64287 Darmstadt, Germany
| | - Andreas Plog
- Center of Smart Interfaces
- Technical University Darmstadt
- 64287 Darmstadt, Germany
| | - Yeping Xu
- Eduard-Zintl-Institute for Inorganic Chemistry and Physical Chemistry
- Technical University Darmstadt
- D-64287 Darmstadt, Germany
| | - Gerd Buntkowsky
- Eduard-Zintl-Institute for Inorganic Chemistry and Physical Chemistry
- Technical University Darmstadt
- D-64287 Darmstadt, Germany
| | - Torsten Gutmann
- Eduard-Zintl-Institute for Inorganic Chemistry and Physical Chemistry
- Technical University Darmstadt
- D-64287 Darmstadt, Germany
| | - Kai Zhang
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Science
- Technical University Darmstadt
- 64287 Darmstadt, Germany
| |
Collapse
|