1
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Nimerovsky E, Najbauer EÉ, Becker S, Andreas LB. Great Offset Difference Internuclear Selective Transfer. J Phys Chem Lett 2023; 14:3939-3945. [PMID: 37078685 PMCID: PMC10150390 DOI: 10.1021/acs.jpclett.3c00194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Carbon-carbon dipolar recoupling sequences are frequently used building blocks in routine magic-angle spinning NMR experiments. While broadband homonuclear first-order dipolar recoupling sequences mainly excite intra-residue correlations, selective methods can detect inter-residue transfers and long-range correlations. Here, we present the great offset difference internuclear selective transfer (GODIST) pulse sequence optimized for selective carbonyl or aliphatic recoupling at fast magic-angle spinning, here, 55 kHz. We observe a 3- to 5-fold increase in intensities compared with broadband RFDR recoupling for perdeuterated microcrystalline SH3 and for the membrane protein influenza A M2 in lipid bilayers. In 3D (H)COCO(N)H and (H)CO(CO)NH spectra, inter-residue carbonyl-carbonyl correlations up to about 5 Å are observed in uniformly 13C-labeled proteins.
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Affiliation(s)
- Evgeny Nimerovsky
- Department of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Eszter Éva Najbauer
- Department of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Stefan Becker
- Department of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Loren B Andreas
- Department of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
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2
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Fykouras K, Lahnsteiner J, Leupold N, Tinnemans P, Moos R, Panzer F, de Wijs GA, Bokdam M, Grüninger H, Kentgens APM. Disorder to order: how halide mixing in MAPbI 3-xBr x perovskites restricts MA dynamics. JOURNAL OF MATERIALS CHEMISTRY. A 2023; 11:4587-4597. [PMID: 37383090 PMCID: PMC10294545 DOI: 10.1039/d2ta09069d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 02/01/2023] [Indexed: 06/30/2023]
Abstract
Mixed-halide lead perovskites are of particular interest for the design of tandem solar cells currently reaching record efficiencies. While halide phase segregation upon illumination of mixed perovskites is extensively studied, the effect of halide disorder on A cation dynamics is not well understood, despite its importance for charge carrier diffusion and lifetime. Here, we study the methylammonium (MA) reorientational dynamics in mixed halide MAPbI3-xBrx perovskites by a combined approach of experimental solid-state NMR spectroscopy and molecular dynamics (MD) simulations based on machine-learning force-fields (MLFF). 207Pb NMR spectra indicate the halides are randomly distributed over their lattice positions, whereas PXRD measurements show that all mixed MAPbI3-xBrx samples are cubic. The experimental 14N spectra and 1H double-quantum (DQ) NMR data reveal anisotropic MA reorientations depending on the halide composition and thus associated disorder in the inorganic sublattice. MD calculations allow us to correlate these experimental results to restrictions of MA dynamics due to preferred MA orientations in their local Pb8I12-nBrn "cages". Based on the experimental and simulated results, we develop a phenomenological model that correlates the 1H dipolar coupling and thus the MA dynamics with the local composition and reproduces the experimental data over the whole composition range. We show that the dominant interaction between the MA cations and the Pb-X lattice that influences the cation dynamics is the local electrostatic potential being inhomogeneous in mixed halide systems. As such, we generate a fundamental understanding of the predominant interaction between the MA cations and the inorganic sublattice, as well as MA dynamics in asymmetric halide coordinations.
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Affiliation(s)
- Kostas Fykouras
- Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente P.O. Box 217 7500 AE Enschede Netherlands
| | - Jonathan Lahnsteiner
- Department of Functional Materials, University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany
| | - Nico Leupold
- Department of Functional Materials, University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany
| | - Paul Tinnemans
- Radboud University, Institute for Molecules and Materials Heyendaalseweg 135 6525 AJ Nijmegen Netherlands
| | - Ralf Moos
- Department of Functional Materials, University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany
| | - Fabian Panzer
- Soft Matter Optoelectronics, University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany
| | - Gilles A de Wijs
- Radboud University, Institute for Molecules and Materials Heyendaalseweg 135 6525 AJ Nijmegen Netherlands
| | - Menno Bokdam
- Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente P.O. Box 217 7500 AE Enschede Netherlands
| | - Helen Grüninger
- Radboud University, Institute for Molecules and Materials Heyendaalseweg 135 6525 AJ Nijmegen Netherlands
- Inorganic Chemistry III and Northern Bavarian NMR Centre, University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany
| | - Arno P M Kentgens
- Radboud University, Institute for Molecules and Materials Heyendaalseweg 135 6525 AJ Nijmegen Netherlands
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3
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Andrade-Acuña D, Sanchez SA, González-Jiménez A, Valentin JL, Marcos-Fernández Á, Dahrouch M. Obtention of biocompatible hydrogels containing PEGs/silicon fatty blocks with potential use as A controlled release system. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Liang L, Ji Y, Chen K, Gao P, Zhao Z, Hou G. Solid-State NMR Dipolar and Chemical Shift Anisotropy Recoupling Techniques for Structural and Dynamical Studies in Biological Systems. Chem Rev 2022; 122:9880-9942. [PMID: 35006680 DOI: 10.1021/acs.chemrev.1c00779] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
With the development of NMR methodology and technology during the past decades, solid-state NMR (ssNMR) has become a particularly important tool for investigating structure and dynamics at atomic scale in biological systems, where the recoupling techniques play pivotal roles in modern high-resolution MAS NMR. In this review, following a brief introduction on the basic theory of recoupling in ssNMR, we highlight the recent advances in dipolar and chemical shift anisotropy recoupling methods, as well as their applications in structural determination and dynamical characterization at multiple time scales (i.e., fast-, intermediate-, and slow-motion). The performances of these prevalent recoupling techniques are compared and discussed in multiple aspects, together with the representative applications in biomolecules. Given the recent emerging advances in NMR technology, new challenges for recoupling methodology development and potential opportunities for biological systems are also discussed.
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Affiliation(s)
- Lixin Liang
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Ji
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kuizhi Chen
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Pan Gao
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Zhenchao Zhao
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Guangjin Hou
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
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5
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Mathew R, Stevensson B, Edén M. Refined Structures of O-Phospho-l-serine and Its Calcium Salt by New Multinuclear Solid-State NMR Crystallography Methods. J Phys Chem B 2021; 125:10985-11004. [PMID: 34553936 PMCID: PMC8503883 DOI: 10.1021/acs.jpcb.1c05587] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Indexed: 12/17/2022]
Abstract
O-phospho-l-serine (Pser) and its Ca salt, Ca[O-phospho-l-serine]·H2O (CaPser), play important roles for bone mineralization and were recently also proposed to account for the markedly improved bone-adhesive properties of Pser-doped calcium phosphate-based cements for biomedical implants. However, the hitherto few proposed structural models of Pser and CaPser were obtained by X-ray diffraction, thereby leaving the proton positions poorly defined. Herein, we refine the Pser and CaPser structures by density functional theory (DFT) calculations and contrast them with direct interatomic-distance constraints from two-dimensional (2D) nuclear magnetic resonance (NMR) correlation experimentation at fast magic-angle spinning (MAS), encompassing double-quantum-single-quantum (2Q-1Q) 1H NMR along with heteronuclear 13C{1H} and 31P{1H} correlation NMR experiments. The Pser and CaPser structures before and after refinements by DFT were validated against sets of NMR-derived effective 1H-1H, 1H-31P, and 1H-13C distances, which confirmed the improved accuracy of the refined structures. Each distance set was derived from one sole 2D NMR experiment applied to a powder without isotopic enrichment. The distances were extracted without invoking numerical spin-dynamics simulations or approximate phenomenological models. We highlight the advantages and limitations of the new distance-extraction procedure. Isotropic 1H, 13C, and 31P chemical shifts obtained by DFT calculations using the gauge including projector augmented wave (GIPAW) method agreed very well with the experimental results. We discuss the isotropic and anisotropic 13C and 31P chemical-shift parameters in relation to the previous literature, where most data on CaPser are reported herein for the first time.
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Affiliation(s)
- Renny Mathew
- Department of Materials and Environmental
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Baltzar Stevensson
- Department of Materials and Environmental
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Mattias Edén
- Department of Materials and Environmental
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
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6
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Nimerovsky E, Xue K, Movellan K, Andreas L. Heteronuclear and homonuclear radio-frequency-driven recoupling. MAGNETIC RESONANCE (GOTTINGEN, GERMANY) 2021; 2:343-353. [PMID: 37904771 PMCID: PMC10539778 DOI: 10.5194/mr-2-343-2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/11/2021] [Indexed: 11/01/2023]
Abstract
The radio-frequency-driven recoupling (RFDR) pulse sequence is used in magic-angle spinning (MAS) NMR to recouple homonuclear dipolar interactions. Here we show simultaneous recoupling of both the heteronuclear and homonuclear dipolar interactions by applying RFDR pulses on two channels. We demonstrate the method, called HETeronuclear RFDR (HET-RFDR), on microcrystalline SH3 samples at 10 and 55.555 kHz MAS. Numerical simulations of both HET-RFDR and standard RFDR sequences allow for better understanding of the influence of offsets and paths of magnetization transfers for both HET-RFDR and RFDR experiments, as well as the crucial role of XY phase cycling.
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Affiliation(s)
- Evgeny Nimerovsky
- Department of NMR-based Structural Biology, Max Planck Institute for
Biophysical Chemistry, Am Fassberg 11, Göttingen, Germany
| | - Kai Xue
- Department of NMR-based Structural Biology, Max Planck Institute for
Biophysical Chemistry, Am Fassberg 11, Göttingen, Germany
| | - Kumar Tekwani Movellan
- Department of NMR-based Structural Biology, Max Planck Institute for
Biophysical Chemistry, Am Fassberg 11, Göttingen, Germany
| | - Loren B. Andreas
- Department of NMR-based Structural Biology, Max Planck Institute for
Biophysical Chemistry, Am Fassberg 11, Göttingen, Germany
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7
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Grüninger H, Bokdam M, Leupold N, Tinnemans P, Moos R, De Wijs GA, Panzer F, Kentgens APM. Microscopic (Dis)order and Dynamics of Cations in Mixed FA/MA Lead Halide Perovskites. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:1742-1753. [PMID: 33542781 PMCID: PMC7848893 DOI: 10.1021/acs.jpcc.0c10042] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 12/31/2020] [Indexed: 05/02/2023]
Abstract
Recent developments in the field of high efficiency perovskite solar cells are based on stabilization of the perovskite crystal structure of FAPbI3 while preserving its excellent optoelectronic properties. Compositional engineering of, for example, MA or Br mixed into FAPbI3 results in the desired effects, but detailed knowledge of local structural features, such as local (dis)order or cation interactions of formamidinium (FA) and methylammonium (MA), is still limited. This knowledge is, however, crucial for their further development. Here, we shed light on the microscopic distribution of MA and FA in mixed perovskites MA1-x FA x PbI3 and MA0.15FA0.85PbI2.55Br0.45 by combining high-resolution double-quantum 1H solid-state nuclear magnetic resonance (NMR) spectroscopy with state-of-the-art near-first-principles accuracy molecular dynamics (MD) simulations using machine-learning force-fields (MLFFs). We show that on a small local scale, partial MA and FA clustering takes place over the whole MA/FA compositional range. A reasonable driving force for the clustering might be an increase of the dynamical freedom of FA cations in FA-rich regions. While MA0.15FA0.85PbI2.55Br0.45 displays similar MA and FA ordering as the MA1-x FA x PbI3 systems, the average cation-cation interaction strength increased significantly in this double mixed material, indicating a restriction of the space accessible to the cations or their partial immobilization upon Br- incorporation. Our results shed light on the heterogeneities in cation composition of mixed halide perovskites, helping to exploit their full optoelectronic potential.
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Affiliation(s)
- Helen Grüninger
- Institute
for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
- H.G.: email,
| | - Menno Bokdam
- Faculty
of Physics and Center for Computational Materials Sciences, University of Vienna, Sensengasse 8/12, 1090 Vienna, Austria
- Faculty
of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
- M.G.: email,
| | - Nico Leupold
- Department
of Functional Materials, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Paul Tinnemans
- Institute
for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Ralf Moos
- Department
of Functional Materials, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Gilles A. De Wijs
- Institute
for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Fabian Panzer
- Department
of Functional Materials, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
- Soft
Matter Optoelectronics, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Arno P. M. Kentgens
- Institute
for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
- A.P.M.K.: email,
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8
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Hodgkinson P. NMR crystallography of molecular organics. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2020; 118-119:10-53. [PMID: 32883448 DOI: 10.1016/j.pnmrs.2020.03.001] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 02/25/2020] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
Developments of NMR methodology to characterise the structures of molecular organic structures are reviewed, concentrating on the previous decade of research in which density functional theory-based calculations of NMR parameters in periodic solids have become widespread. With a focus on demonstrating the new structural insights provided, it is shown how "NMR crystallography" has been used in a spectrum of applications from resolving ambiguities in diffraction-derived structures (such as hydrogen atom positioning) to deriving complete structures in the absence of diffraction data. As well as comprehensively reviewing applications, the different aspects of the experimental and computational techniques used in NMR crystallography are surveyed. NMR crystallography is seen to be a rapidly maturing subject area that is increasingly appreciated by the wider crystallographic community.
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Affiliation(s)
- Paul Hodgkinson
- Department of Chemistry, Durham University, Stockton Road, Durham DH1 3LE, UK.
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9
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Yu Y, Stevensson B, Pujari-Palmer M, Guo H, Engqvist H, Edén M. The Monetite Structure Probed by Advanced Solid-State NMR Experimentation at Fast Magic-Angle Spinning. Int J Mol Sci 2019; 20:ijms20246356. [PMID: 31861132 PMCID: PMC6940740 DOI: 10.3390/ijms20246356] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 12/10/2019] [Accepted: 12/12/2019] [Indexed: 01/29/2023] Open
Abstract
We present a solid-state nuclear magnetic resonance (NMR) spectroscopy study of the local 31P and 1H environments in monetite [CaHPO4; dicalcium phosphate anhydrous (DCPA)], as well as their relative spatial proximities. Each of the three 1H NMR peaks was unambiguously assigned to its respective crystallographically unique H site of monetite, while their pairwise spatial proximities were probed by homonuclear 1H–1H double quantum–single quantum NMR experimentation under fast magic-angle spinning (MAS) of 66 kHz. We also examined the relative 1H–31P proximities among the inequivalent {P1, P2} and {H1, H2, H3} sites in monetite; the corresponding shortest internuclear 1H–31P distances accorded well with those of a previous neutron diffraction study. The NMR results from the monetite phase were also contrasted with those observed from the monetite component present in a pyrophosphate-bearing calcium phosphate cement, demonstrating that while the latter represents a disordered form of monetite, it shares all essential local features of the monetite structure.
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Affiliation(s)
- Yang Yu
- Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden; (Y.Y.); (B.S.); (H.G.)
| | - Baltzar Stevensson
- Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden; (Y.Y.); (B.S.); (H.G.)
| | - Michael Pujari-Palmer
- Applied Material Science, Department of Engineering, Uppsala University, SE-751 21 Uppsala, Sweden; (M.P.-P.); (H.E.)
| | - Hua Guo
- Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden; (Y.Y.); (B.S.); (H.G.)
| | - Håkan Engqvist
- Applied Material Science, Department of Engineering, Uppsala University, SE-751 21 Uppsala, Sweden; (M.P.-P.); (H.E.)
| | - Mattias Edén
- Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden; (Y.Y.); (B.S.); (H.G.)
- Correspondence:
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10
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Ahmadi M, Löser L, Fischer K, Saalwächter K, Seiffert S. Connectivity Defects and Collective Assemblies in Model Metallo‐Supramolecular Dual‐Network Hydrogels. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900400] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Mostafa Ahmadi
- Department of Polymer Engineering and Color Technology Amirkabir University of Technology Tehran Iran
- Institute of Physical Chemistry Johannes Gutenberg‐Universität Mainz Duesbergweg 10‐14 D‐55128 Mainz Germany
| | - Lucas Löser
- Institut für Physik‐NMR Martin‐Luther‐Universität Halle‐Wittenberg Betty‐Heimann‐Str. 7 D‐06120 Halle Germany
| | - Karl Fischer
- Institute of Physical Chemistry Johannes Gutenberg‐Universität Mainz Duesbergweg 10‐14 D‐55128 Mainz Germany
| | - Kay Saalwächter
- Institut für Physik‐NMR Martin‐Luther‐Universität Halle‐Wittenberg Betty‐Heimann‐Str. 7 D‐06120 Halle Germany
| | - Sebastian Seiffert
- Institute of Physical Chemistry Johannes Gutenberg‐Universität Mainz Duesbergweg 10‐14 D‐55128 Mainz Germany
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11
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Naumova A, Agudelo DC, Villar MA, Vega DA, Valentin JL, Saalwächter K. Microscopic State of Polymer Network Chains upon Swelling and Deformation. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00971] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anna Naumova
- Institut für Physik—NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Straße 7, 06120 Halle, Germany
| | - Diana Carolina Agudelo
- Department of Chemical Engineering, Planta Piloto de Ingeniería Química, Universidad Nacional del Sur, CONICET, B8002 Bahía Blanca, Argentina
| | - Marcelo A. Villar
- Department of Chemical Engineering, Planta Piloto de Ingeniería Química, Universidad Nacional del Sur, CONICET, B8002 Bahía Blanca, Argentina
| | - Daniel A. Vega
- Department of Physics, Instituto de Física del Sur (IFISUR), Universidad Nacional del Sur, CONICET, B8002 Bahía Blanca, Argentina
| | | | - Kay Saalwächter
- Institut für Physik—NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Straße 7, 06120 Halle, Germany
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12
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Kobayashi T, Pruski M. Spatial Distribution of Silica-Bound Catalytic Organic Functional Groups Can Now Be Revealed by Conventional and DNP-Enhanced Solid-State NMR Methods. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02017] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Takeshi Kobayashi
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
| | - Marek Pruski
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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13
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Mordvinkin A, Suckow M, Böhme F, Colby RH, Creton C, Saalwächter K. Hierarchical Sticker and Sticky Chain Dynamics in Self-Healing Butyl Rubber Ionomers. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00159] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Anton Mordvinkin
- Institut für Physik—NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, 06120 Halle (Saale), Germany
| | - Marcus Suckow
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Frank Böhme
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Ralph H. Colby
- Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Costantino Creton
- Laboratoire de Sciences et Ingénierie de la Matière Molle, CNRS, ESPCI Paris, PSL Research University, 10 Rue Vauquelin, 75005 Paris, France
| | - Kay Saalwächter
- Institut für Physik—NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, 06120 Halle (Saale), Germany
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14
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Thureau P, Sturniolo S, Zilka M, Ziarelli F, Viel S, Yates JR, Mollica G. Reducing the computational cost of NMR crystallography of organic powders at natural isotopic abundance with the help of 13 C- 13 C dipolar couplings. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:256-264. [PMID: 30735578 DOI: 10.1002/mrc.4848] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 01/22/2019] [Accepted: 02/02/2019] [Indexed: 06/09/2023]
Abstract
Structure determination of functional organic compounds remains a formidable challenge when the sample exists as a powder. Nuclear magnetic resonance crystallography approaches based on the comparison of experimental and Density Functional Theory (DFT)-computed 1 H chemical shifts have already demonstrated great potential for structure determination of organic powders, but limitations still persist. In this study, we discuss the possibility of using 13 C-13 C dipolar couplings quantified on powdered theophylline at natural isotopic abundance with the help of dynamic nuclear polarization, to realize a DFT-free, rapid screening of a pool of structures predicted by ab initio random structure search. We show that although 13 C-13 C dipolar couplings can identify structures possessing long range structural motifs and unit cell parameters close to those of the true structure, it must be complemented with other data to recover information about the presence and the chemical nature of the supramolecular interactions.
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Affiliation(s)
| | - Simone Sturniolo
- Scientific Computing Department, Rutherford Appleton Laboratory, Chilton, Didcot, UK
| | - Miri Zilka
- Department of Physics, University of Warwick, Coventry, UK
| | - Fabio Ziarelli
- Aix Marseille Univ, CNRS, Centrale Marseille, FSCM FR1739, Marseille, France
| | - Stéphane Viel
- Aix Marseille Univ, CNRS, ICR, Marseille, France
- Institut Universitaire de France, Paris, France
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15
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Zhang Z, Liu H, Deng J, Tycko R, Yang J. Optimization of band-selective homonuclear dipolar recoupling in solid-state NMR by a numerical phase search. J Chem Phys 2019; 150:154201. [PMID: 31005077 DOI: 10.1063/1.5092986] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Spin polarization transfers among aliphatic 13C nuclei, especially 13Cα-13Cβ transfers, permit correlations of their nuclear magnetic resonance (NMR) frequencies that are essential for signal assignments in multidimensional solid-state NMR of proteins. We derive and demonstrate a new radio-frequency (RF) excitation sequence for homonuclear dipolar recoupling that enhances spin polarization transfers among aliphatic 13C nuclei at moderate magic-angle spinning (MAS) frequencies. The phase-optimized recoupling sequence with five π pulses per MAS rotation period (denoted as PR5) is derived initially from systematic numerical simulations in which only the RF phases are varied. Subsequent theoretical analysis by average Hamiltonian theory explains the favorable properties of numerically optimized phase schemes. The high efficiency of spin polarization transfers in simulations is preserved in experiments, in part because the RF field amplitude in PR5 is only 2.5 times the MAS frequency so that relatively low 1H decoupling powers are required. Experiments on a microcrystalline sample of the β1 immunoglobulin binding domain of protein G demonstrate an average enhancement factor of 1.6 for 13Cα → 13Cβ polarization transfers, compared to the standard 13C-13C spin-diffusion method, implying a two-fold time saving in relevant 2D and 3D experiments.
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Affiliation(s)
- Zhengfeng Zhang
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
| | - Hui Liu
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
| | - Jing Deng
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
| | - Robert Tycko
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA
| | - Jun Yang
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
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16
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Wang F, Chen S, Wu Q, Zhang R, Sun P. Strain-induced structural and dynamic changes in segmented polyurethane elastomers. POLYMER 2019. [DOI: 10.1016/j.polymer.2018.12.062] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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17
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Grüninger H, Schmutzler A, Siegel R, Armstrong K, Frost DJ, Senker J. Quantitative description of 1H SQ and DQ coherences for the hydroxyl disorder within hydrous ringwoodite. Phys Chem Chem Phys 2018; 20:15098-15105. [PMID: 29799049 DOI: 10.1039/c8cp00863a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Proton-containing point defects in solid materials are important for a variety of properties ranging from ionic transport over thermal conductivity up to compressibility. Ultrafast magic-angle spinning techniques nowadays offer high-resolution solid-state NMR spectra, even for 1H, and thus open up possibilities to study the underlying defect chemistry. Nevertheless, disorder within such defects again leads to heavy spectral overlap of 1H resonances, which prevents quantitative analysis of defect concentrations, if several defect types are present. Here, we present a strategy to overcome this limitation by simulating the 1H lineshape as well as 1H-1H double-quantum buildup curves, which we then validate against the experimental data in a joint cost function. To mimic the local structural disorder, we use molecular dynamics simulations at the DFT level. It turned out to be advantageous for the joint refinement to put the computational effort into the structural optimisation to derive accurate proton positions and to use empirical correlations for the relation between isotropic and anisotropic 1H chemical shifts and structural elements. The expressiveness of this approach is demonstrated on ringwoodite's (γ-Mg2SiO4) OH defect chemistry containing four different defect types in octahedral and tetrahedral voids with both pure Mg and mixed Si and Mg cation environments. Still, we determine the ratio for each defect type with an accuracy of about 5% as a result of the minimization of the joint cost function. We expect that our approach is generally applicable for local proton disorder and might prove to be a valuable alternative to the established AIRSS and Monte Carlo methods, respectively.
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Affiliation(s)
- Helen Grüninger
- Anorganische Chemie III, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany.
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18
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Topological Insight into Superabsorbent Hydrogel Network Structures: a 1
H Double-Quantum NMR Study. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800100] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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19
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Roos M, Wang T, Shcherbakov AA, Hong M. Fast Magic-Angle-Spinning 19F Spin Exchange NMR for Determining Nanometer 19F- 19F Distances in Proteins and Pharmaceutical Compounds. J Phys Chem B 2018; 122:2900-2911. [PMID: 29486126 PMCID: PMC6312665 DOI: 10.1021/acs.jpcb.8b00310] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Internuclear distances measured using NMR provide crucial constraints of three-dimensional structures but are often restricted to about 5 Å due to the weakness of nuclear-spin dipolar couplings. For studying macromolecular assemblies in biology and materials science, distance constraints beyond 1 nm will be extremely valuable. Here we present an extensive and quantitative analysis of the feasibility of 19F spin exchange NMR for precise and robust measurements of interatomic distances up to 1.6 nm at a magnetic field of 14.1 T, under 20-40 kHz magic-angle spinning (MAS). The measured distances are comparable to those achievable from paramagnetic relaxation enhancement but have higher precision, which is better than ±1 Å for short distances and ±2 Å for long distances. For 19F spins with the same isotropic chemical shift but different anisotropic chemical shifts, intermediate MAS frequencies of 15-25 kHz without 1H irradiation accelerate spin exchange. For spectrally resolved 19F-19F spin exchange, 1H-19F dipolar recoupling significantly speeds up 19F-19F spin exchange. On the basis of data from five fluorinated synthetic, pharmaceutical, and biological compounds, we obtained two general curves for spin exchange between CF groups and between CF3 and CF groups. These curves allow 19F-19F distances to be extracted from the measured spin exchange rates after taking into account 19F chemical shifts. These results demonstrate the robustness of 19F spin exchange NMR for distance measurements in a wide range of biological and chemical systems.
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Affiliation(s)
- Matthias Roos
- Department of Chemistry , Massachusetts Institute of Technology , 170 Albany Street , Cambridge , Massachusetts 02139 , United States
| | - Tuo Wang
- Department of Chemistry , Massachusetts Institute of Technology , 170 Albany Street , Cambridge , Massachusetts 02139 , United States
| | - Alexander A Shcherbakov
- Department of Chemistry , Massachusetts Institute of Technology , 170 Albany Street , Cambridge , Massachusetts 02139 , United States
| | - Mei Hong
- Department of Chemistry , Massachusetts Institute of Technology , 170 Albany Street , Cambridge , Massachusetts 02139 , United States
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20
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Yan ZB, Young AP, Goward GR. A magnetic resonance and electrochemical study of the role of polymer mobility in supporting hydrogen transport in perfluorosulfonic acid membranes. Phys Chem Chem Phys 2018; 20:19098-19109. [DOI: 10.1039/c8cp02676a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Perfluorosulfonic acid (PFSA) materials have been used in polymer electrolyte membrane fuel cells (PEMFCs) as electrolyte materials due to their mechanical durability and high proton conductivity.
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Affiliation(s)
- Z. Blossom Yan
- Department of Chemistry and Chemical Biology
- McMaster University
- Hamilton
- Canada
| | - Alan P. Young
- Research and Development Division
- Ballard Power Systems
- Burnaby
- Canada
| | - Gillian R. Goward
- Department of Chemistry and Chemical Biology
- McMaster University
- Hamilton
- Canada
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21
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Zou X, Kui X, Zhang R, Zhang Y, Wang X, Wu Q, Chen T, Sun P. Viscoelasticity and Structures in Chemically and Physically Dual-Cross-Linked Hydrogels: Insights from Rheology and Proton Multiple-Quantum NMR Spectroscopy. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01854] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Xueting Zou
- Key
Laboratory of Functional Polymer Materials of Ministry of Education
and College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Xing Kui
- Department
of Polymer Science and Engineering, Nanjing University, Nanjing 210093, China
| | - Rongchun Zhang
- State
Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300071, P. R. China
| | - Yue Zhang
- Department
of Polymer Science and Engineering, Nanjing University, Nanjing 210093, China
| | - Xiaoliang Wang
- Department
of Polymer Science and Engineering, Nanjing University, Nanjing 210093, China
| | - Qiang Wu
- Key
Laboratory of Functional Polymer Materials of Ministry of Education
and College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Tiehong Chen
- Institute
of New Catalytic Materials Science, School of Materials Science and
Engineering, Key Laboratory of Advanced Energy Materials Chemistry
(MOE), Nankai University, Tianjin 300350, P. R. China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, P. R. China
| | - Pingchuan Sun
- Key
Laboratory of Functional Polymer Materials of Ministry of Education
and College of Chemistry, Nankai University, Tianjin 300071, P. R. China
- State
Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300071, P. R. China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, P. R. China
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22
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Lozovoi A, Petrova L, Mattea C, Stapf S, Rössler EA, Fatkullin N. On the theory of the proton dipolar-correlation effect as a method for investigation of segmental displacement in polymer melts. J Chem Phys 2017; 147:074904. [DOI: 10.1063/1.4998184] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A. Lozovoi
- Department Technical Physics II, Technische Universität Ilmenau, 98684 Ilmenau, Germany
- Institute of Physics, Kazan Federal University, Kazan 420008, Tatarstan, Russia
| | - L. Petrova
- Institute of Physics, Kazan Federal University, Kazan 420008, Tatarstan, Russia
| | - C. Mattea
- Department Technical Physics II, Technische Universität Ilmenau, 98684 Ilmenau, Germany
| | - S. Stapf
- Department Technical Physics II, Technische Universität Ilmenau, 98684 Ilmenau, Germany
| | - E. A. Rössler
- Department Experimentalphysik II, University of Bayreuth, 95440 Bayreuth, Germany
| | - N. Fatkullin
- Institute of Physics, Kazan Federal University, Kazan 420008, Tatarstan, Russia
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23
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Bohle A, Dudenko D, Koenen N, Sebastiani D, Allard S, Scherf U, Spiess HW, Hansen MR. A Generalized Packing Model for Bulk Crystalline Regioregular Poly(3-alkylthiophenes) with Extended Side Chains. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700266] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Anne Bohle
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Dmytro Dudenko
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Nils Koenen
- Bergische Universität Wuppertal; Gauss-Straße 20 42097 Wuppertal Germany
| | - Daniel Sebastiani
- Department of Chemistry; Martin-Luther Universität Halle-Wittenberg; Von-Danckelmann-Platz 4 06120 Halle/Saale Germany
| | - Sybille Allard
- Bergische Universität Wuppertal; Gauss-Straße 20 42097 Wuppertal Germany
| | - Ullrich Scherf
- Bergische Universität Wuppertal; Gauss-Straße 20 42097 Wuppertal Germany
| | | | - Michael Ryan Hansen
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
- Institute of Physical Chemistry; Westfälische Wilhelms-Universität Münster; Corrensstr. 28/30 48149 Münster Germany
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24
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Naumova A, Tschierske C, Saalwächter K. Orientation-dependent proton double-quantum NMR build-up function for soft materials with anisotropic mobility. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 82-83:22-28. [PMID: 28167375 DOI: 10.1016/j.ssnmr.2017.01.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 01/11/2017] [Accepted: 01/24/2017] [Indexed: 06/06/2023]
Abstract
In recent years, the analysis of proton double-quantum NMR build-up curves has become an important tool to quantify anisotropic mobility in different kinds of soft materials such as polymer networks or liquid crystals. In the former case, such data provides a measure of orientation-dependent residual (time-averaged) dipolar couplings arising from anisotropic segmental motions, informing about the length and the state of local stretching of the network chains. Previous studies of macroscopically ordered, i.e. stretched, networks were subject to the limitation that a detailed build-up curve analysis on the basis of a universal "Abragam-like" (A-l) build-up function valid for a proton multi-spin system was only possible for an isotropic orientation-averaged response. This situation is here remedied by introducing a generic orientation-dependent build-up function for an anisotropically mobile protonated molecular segment. We discuss an application to the modeling of data for a stretched network measured at different orientations with respect to the magnetic field, and present a validation by fitting data of different liquid-crystal molecules oriented in the magnetic field.
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Affiliation(s)
- Anna Naumova
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120 Halle, Germany
| | - Carsten Tschierske
- Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Str. 2, D-06120 Halle, Germany
| | - Kay Saalwächter
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120 Halle, Germany.
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25
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Bärenwald R, Achilles A, Lange F, Ferreira TM, Saalwächter K. Applications of Solid-State NMR Spectroscopy for the Study of Lipid Membranes with Polyphilic Guest (Macro)Molecules. Polymers (Basel) 2016; 8:E439. [PMID: 30974716 PMCID: PMC6432237 DOI: 10.3390/polym8120439] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 12/01/2016] [Accepted: 12/08/2016] [Indexed: 11/16/2022] Open
Abstract
The incorporation of polymers or smaller complex molecules into lipid membranes allows for property modifications or the introduction of new functional elements. The corresponding molecular-scale details, such as changes in dynamics or features of potential supramolecular structures, can be studied by a variety of solid-state NMR techniques. Here, we review various approaches to characterizing the structure and dynamics of the guest molecules as well as the lipid phase structure and dynamics by different high-resolution magic-angle spinning proton and 13C NMR experiments as well as static 31P NMR experiments. Special emphasis is placed upon the incorporation of novel synthetic polyphilic molecules such as shape-persistent T- and X-shaped molecules as well as di- and tri-block copolymers. Most of the systems studied feature dynamic heterogeneities, for instance those arising from the coexistence of different phases; possibilities for a quantitative assessment are of particular concern.
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Affiliation(s)
- Ruth Bärenwald
- Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle, Germany
| | - Anja Achilles
- Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle, Germany
| | - Frank Lange
- Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle, Germany
| | - Tiago Mendes Ferreira
- Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle, Germany
| | - Kay Saalwächter
- Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle, Germany.
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26
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27
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Yan ZB, Brouwer DH, Goward GR. 19F Double Quantum NMR Spectroscopy: A Tool for Probing Dynamics in Proton-Conducting Fluorinated Polymer Materials. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01291] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Z. Blossom Yan
- Department
of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada L8S 4M1
| | - Darren H. Brouwer
- Department
of Chemistry, Redeemer University College, Ancaster, Ontario, Canada L9K 1J4
| | - Gillian R. Goward
- Department
of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada L8S 4M1
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28
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Wu B, Chassé W, Peters R, Brooijmans T, Dias AA, Heise A, Duxbury CJ, Kentgens APM, Brougham DF, Litvinov VM. Network Structure in Acrylate Systems: Effect of Junction Topology on Cross-Link Density and Macroscopic Gel Properties. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01070] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Bing Wu
- National
Institute for Cellular Biotechnology, School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
- DSM Ahead Materials Sciences R&D, Urmonderbaan 22, 6167 RD Geleen, The Netherlands
- DSM Resolve, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - Walter Chassé
- Institute
for Molecules and Materials, Radboud University Nijmegen, Heyendaalsweg
135, 6525 AJ Nijmegen, The Netherlands
| | - Ron Peters
- DSM Coating
Resins, Sluisweg 12, 5145
PE, Waalwijk, The Netherlands
- Analytical-Chemistry
Group, Van’t Hoff Institute for Molecular Science, University of Amsterdam, Amsterdam, The Netherlands
| | - Ton Brooijmans
- DSM Coating
Resins, Sluisweg 12, 5145
PE, Waalwijk, The Netherlands
| | - Aylvin A. Dias
- DSM Ahead Materials Sciences R&D, Urmonderbaan 22, 6167 RD Geleen, The Netherlands
| | - Andreas Heise
- School
of
Pharmacy, Royal College of Surgeons in Ireland, 123 St. Stephen’s Green, Dublin 2, Ireland
| | | | - Arno P. M. Kentgens
- Institute
for Molecules and Materials, Radboud University Nijmegen, Heyendaalsweg
135, 6525 AJ Nijmegen, The Netherlands
| | - Dermot F. Brougham
- School
of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Victor M. Litvinov
- Institute
for Molecules and Materials, Radboud University Nijmegen, Heyendaalsweg
135, 6525 AJ Nijmegen, The Netherlands
- DSM Resolve, P.O. Box 18, 6160 MD Geleen, The Netherlands
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29
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Lozovoi A, Mattea C, Herrmann A, Rössler EA, Stapf S, Fatkullin N. Communication: Proton NMR dipolar-correlation effect as a method for investigating segmental diffusion in polymer melts. J Chem Phys 2016; 144:241101. [PMID: 27369489 DOI: 10.1063/1.4954664] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A. Lozovoi
- Department of Technical Physics II, Technische Universität Ilmenau, 98684 Ilmenau, Germany
| | - C. Mattea
- Department of Technical Physics II, Technische Universität Ilmenau, 98684 Ilmenau, Germany
| | - A. Herrmann
- Department of Experimentalphysik II, University of Bayreuth, 95440 Bayreuth, Germany
| | - E. A. Rössler
- Department of Experimentalphysik II, University of Bayreuth, 95440 Bayreuth, Germany
| | - S. Stapf
- Department of Technical Physics II, Technische Universität Ilmenau, 98684 Ilmenau, Germany
| | - N. Fatkullin
- Institute of Physics, Kazan Federal University, Kazan, 420008 Tatarstan, Russia
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30
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Achilles A, Bärenwald R, Lechner BD, Werner S, Ebert H, Tschierske C, Blume A, Bacia K, Saalwächter K. Self-Assembly of X-Shaped Bolapolyphiles in Lipid Membranes: Solid-State NMR Investigations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:673-682. [PMID: 26735449 DOI: 10.1021/acs.langmuir.5b03712] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A novel class of rigid-rod bolapolyphilic molecules with three philicities (rigid aromatic core, mobile aliphatic side chains, polar end groups) has recently been demonstrated to incorporate into and span lipid membranes, and to exhibit a rich variety of self-organization modes, including macroscopically ordered snowflake structures with 6-fold symmetry. In order to support a structural model and to better understand the self-organization on a molecular scale, we here report on proton and carbon-13 high-resolution magic-angle spinning solid-state NMR investigations of two different bolapolyphiles (BPs) in model membranes of two different phospholipids (DPPC, DOPC). We elucidate the changes in molecular dynamics associated with three new phase transitions detected by calorimetry in composite membranes of different composition, namely, a change in π-π-packing, the melting of lipid tails associated with the superstructure, and the dissolution and onset of free rotation of the BPs. We derive dynamic order parameters associated with different H-H and C-H bond directions of the BPs, demonstrating that the aromatic cores are well packed below the final phase transition, showing only 180° flips of the phenyl ring, and that they perform free rotations with additional oscillations of the long axis when dissolved in the fluid membrane. Our data suggests that BPs not only form ordered superstructures, but also rather homogeneously dispersed π-packed filaments within the lipid gel phase, thus reducing the corrugation of large vesicles.
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Affiliation(s)
- Anja Achilles
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Ruth Bärenwald
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Bob-Dan Lechner
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Stefan Werner
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Helgard Ebert
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Carsten Tschierske
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Alfred Blume
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Kirsten Bacia
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Kay Saalwächter
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
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31
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Werner S, Ebert H, Lechner BD, Lange F, Achilles A, Bärenwald R, Poppe S, Blume A, Saalwächter K, Tschierske C, Bacia K. Dendritic domains with hexagonal symmetry formed by x-shaped bolapolyphiles in lipid membranes. Chemistry 2015; 21:8840-50. [PMID: 25940233 PMCID: PMC4517157 DOI: 10.1002/chem.201405994] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Indexed: 12/22/2022]
Abstract
A novel class of bolapolyphile (BP) molecules are shown to integrate into phospholipid bilayers and self-assemble into unique sixfold symmetric domains of snowflake-like dendritic shapes. The BPs comprise three philicities: a lipophilic, rigid, π–π stacking core; two flexible lipophilic side chains; and two hydrophilic, hydrogen-bonding head groups. Confocal microscopy, differential scanning calorimetry, XRD, and solid-state NMR spectroscopy confirm BP-rich domains with transmembrane-oriented BPs and three to four lipid molecules per BP. Both species remain well organized even above the main 1,2-dipalmitoyl-sn-glycero-3-phosphocholine transition. The BP molecules only dissolve in the fluid membrane above 70 °C. Structural variations of the BP demonstrate that head-group hydrogen bonding is a prerequisite for domain formation. Independent of the head group, the BPs reduce membrane corrugation. In conclusion, the BPs form nanofilaments by π stacking of aromatic cores, which reduce membrane corrugation and possibly fuse into a hexagonal network in the dendritic domains.
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Affiliation(s)
- Stefan Werner
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany).,ZIK HALOmem, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Helgard Ebert
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Bob-Dan Lechner
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Frank Lange
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Anja Achilles
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Ruth Bärenwald
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Silvio Poppe
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Alfred Blume
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany)
| | - Kay Saalwächter
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany).
| | - Carsten Tschierske
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany).
| | - Kirsten Bacia
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany). .,ZIK HALOmem, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale) (Germany).
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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]
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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.
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Affiliation(s)
- Giulia Mollica
- Aix-Marseille Université, CNRS, ICR (UMR 7273), 13397 Marseille cedex 20 (France)
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Zehe CS, Siegel R, Senker J. Influence of proton coupling on symmetry-based homonuclear (19)F dipolar recoupling experiments. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:122-131. [PMID: 25572924 DOI: 10.1016/j.ssnmr.2014.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 12/03/2014] [Accepted: 12/05/2014] [Indexed: 06/04/2023]
Abstract
We study the efficiency of two symmetry based homonuclear (19)F double-quantum recoupling sequences for moderate (R142(6)) and ultra-fast (R144(5)) MAS under the influence of strong (1)H-(1)H and (1)H-(19)F dipolar interactions and (1)H continuous wave decoupling. Simulations based on various spin systems derived from the organic solid 1,3,5-tris(2-fluoro-2-methylpropionylamino)benzene (F-BTA), used as a model system, reveal that the strong-decoupling limit is not accessible even for moderate spinning speeds. Additionally, for the no-decoupling limit improved DQ efficiencies are predicted for both moderate and ultra-fast MAS. Strong perturbations of build-up curves can be avoided by additional stabilisation through supercycling. Additional (1)H cw decoupling during (19)F recoupling rapidly reduces the maximum DQ efficiency when deviating from the no-decoupling limit. These effects were confirmed by experimental data on F-BTA. For moderate spinning the influence of (1)H-(1)H and (1)H-(19)F couplings is markedly stronger compared to ultra-fast MAS. For the latter case those influences reduce to a constant scaling if only short excitation times up to the first minimum are taken into account. Based on this analysis the experimental build-up curves of 1,3,5-tris(2-fluoro-2-methylpropionylamino)benzene can be refined with homonuclear (19)F spin systems which allow to probe even subtle structural differences for the fluorine atoms of F-BTA.
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Affiliation(s)
- Christoph S Zehe
- Inorganic Chemistry III, University of Bayreuth, 95447 Bayreuth, Germany
| | - Renée Siegel
- Inorganic Chemistry III, University of Bayreuth, 95447 Bayreuth, Germany
| | - Jürgen Senker
- Inorganic Chemistry III, University of Bayreuth, 95447 Bayreuth, Germany.
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Mollica G, Dekhil M, Ziarelli F, Thureau P, Viel S. Probing crystal packing of uniformly (13)C-enriched powder samples using homonuclear dipolar coupling measurements. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:114-121. [PMID: 25595367 DOI: 10.1016/j.ssnmr.2014.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Revised: 11/26/2014] [Accepted: 12/05/2014] [Indexed: 06/04/2023]
Abstract
The relationship between the crystal packing of powder samples and long-range (13)C-(13)C homonuclear dipolar couplings is presented and illustrated for the case of uniformly (13)C-enriched L-alanine and L-histidine·HCl·H2O. Dipolar coupling measurement is based on the partial reintroduction of dipolar interactions by spinning the sample slightly off-magic-angle, while the coupling of interest for a given spin pair is isolated with a frequency-selective pulse. A cost function is used to correlate the so-derived dipolar couplings to trial crystal structures of the samples under study. This procedure allowed for the investigation of the l-alanine space group and L-histidine·HCl·H2O space group and unit-cell parameters.
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Affiliation(s)
- Giulia Mollica
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Myriam Dekhil
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Fabio Ziarelli
- Aix-Marseille Université, Centrale Marseille, CNRS, Fédération des sciences chimiques de Marseille FR 1739, 13397 Marseille, France
| | - Pierre Thureau
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France.
| | - Stéphane Viel
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
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Jasinska-Walc L, Bouyahyi M, Rozanski A, Graf R, Hansen MR, Duchateau R. Synthetic Principles Determining Local Organization of Copolyesters Prepared from Lactones and Macrolactones. Macromolecules 2015. [DOI: 10.1021/ma502262e] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Lidia Jasinska-Walc
- SABIC Technology & Innovation, STC Geleen, Urmonderbaan 22, Geleen, The Netherlands
- Department
of Polymer Technology, Chemical Faculty, Gdansk University of Technology, G. Narutowicza Str. 11/12, 80-233 Gdansk, Poland
| | - Miloud Bouyahyi
- SABIC Technology & Innovation, STC Geleen, Urmonderbaan 22, Geleen, The Netherlands
| | - Artur Rozanski
- Centre
of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Robert Graf
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - Michael Ryan Hansen
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
- Department
of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Gustav
Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Rob Duchateau
- SABIC Technology & Innovation, STC Geleen, Urmonderbaan 22, Geleen, The Netherlands
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Malmierca MA, González-Jiménez A, Mora-Barrantes I, Posadas P, Rodríguez A, Ibarra L, Nogales A, Saalwächter K, Valentín JL. Characterization of Network Structure and Chain Dynamics of Elastomeric Ionomers by Means of 1H Low-Field NMR. Macromolecules 2014. [DOI: 10.1021/ma501208g] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- M. A. Malmierca
- Instituto de Ciencia
y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain
| | - A. González-Jiménez
- Instituto de Ciencia
y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain
| | - I. Mora-Barrantes
- Instituto de Ciencia
y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain
| | - P. Posadas
- Instituto de Ciencia
y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain
| | - A. Rodríguez
- Instituto de Ciencia
y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain
| | - L. Ibarra
- Instituto de Ciencia
y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain
| | - A. Nogales
- Instituto de Estructura
de la Materia, IEM-CSIC, C/Serrano
121, 28006 Madrid, Spain
| | - K. Saalwächter
- Institut
für Physik − NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Strasse
7, D-06120 Halle, Germany
| | - J. L. Valentín
- Instituto de Ciencia
y Tecnología de Polímeros (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain
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38
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Saalwächter K. Comparison of double-quantum NMR normalization schemes to measure homonuclear dipole-dipole interactions. J Chem Phys 2014; 141:064201. [PMID: 25134563 DOI: 10.1063/1.4890996] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A recent implementation of a double-quantum (DQ) recoupling solid-state NMR experiment, dubbed DQ-DRENAR, provides a quantitative measure of homonuclear dipole-dipole coupling constants in multispin-1/2 systems. It was claimed to be more robust than another, previously known experiment relying on the recording of point-by-point normalized DQ build-up curves. Focusing on the POST-C7 and BaBa-xy16 DQ pulse sequences, I here present an in-depth comparison of both approaches based upon spin-dynamics simulations, stressing that they are based upon very similar principles and that they are largely equivalent when no imperfections are present. With imperfections, it is found that DQ-DRENAR/POST-C7 does not fully compensate for additional signal dephasing related to chemical shifts (CS) and their anisotropy (CSA), which over-compensates the intrinsic CS(A)-related efficiency loss of the DQ Hamiltonian and leads to an apparent cancellation effect. The simulations further show that the CS(A)-related dephasing in DQ-DRENAR can be removed by another phase cycle step or an improved super-cycled wideband version. Only the latter, or the normalized DQ build-up, are unaffected by CS(A)-related signal loss and yield clean pure dipolar-coupling information subject to unavoidable, pulse sequence specific performance reduction related to higher-order corrections of the dipolar DQ Hamiltonian. The intrinsically super-cycled BaBa-xy16 is shown to exhibit virtually no CS(A) related imperfection terms, but its dipolar performance is somewhat more challenged by CS(A) effects than POST-C7, which can however be compensated when applied at very fast MAS (>50 kHz). Practically, DQ-DRENAR uses a clever phase cycle separation to achieve a significantly shorter experimental time, which can also be beneficially employed in normalized DQ build-up experiments.
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Affiliation(s)
- Kay Saalwächter
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120 Halle, Germany
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Stevensson B, Mathew R, Edén M. Assessing the Phosphate Distribution in Bioactive Phosphosilicate Glasses by 31P Solid-State NMR and Molecular Dynamics Simulations. J Phys Chem B 2014; 118:8863-76. [DOI: 10.1021/jp504601c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Baltzar Stevensson
- Physical
Chemistry Division, Department of Materials and Environmental
Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Renny Mathew
- Physical
Chemistry Division, Department of Materials and Environmental
Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Mattias Edén
- Physical
Chemistry Division, Department of Materials and Environmental
Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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40
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Fatkullin N, Mattea C, Stapf S. On the theory of double quantum NMR in polymer systems: the second cumulant approximation for many spin I = 1/2 systems. J Chem Phys 2013; 139:194905. [PMID: 24320353 DOI: 10.1063/1.4830410] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
General analytical expressions for Double Quantum Nuclear Magnetic Resonance (DQ NMR) kinetic curves of many-spin I = 1∕2 systems are derived with an accuracy of the second cumulant approximation. The expressions obtained exactly describe the initial part of the kinetic curves and provide a reasonable approximation up to times of about the effective spin-relaxation time. For the case when the system contains two isolated spins, this result exactly reproduces known expressions. In the case of polymer melts, the intermolecular magnetic dipole-dipole interactions significantly influence the time dependence of the DQ NMR kinetic curves.
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Affiliation(s)
- N Fatkullin
- Institute of Physics, Kazan Federal University, Kazan, 420008 Tatarstan, Russia
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41
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Lu X, Trébosc J, Lafon O, Amoureux JP. Measurement of the shortest hetero-nuclear distances in multiple-spin systems using constant-time correlation NMR methods. CrystEngComm 2013. [DOI: 10.1039/c3ce40557e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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