1
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Wu G, Dai Y, Hung I, Gan Z, Terskikh V. 1H/ 17O Chemical Shift Waves in Carboxyl-Bridged Hydrogen Bond Networks in Organic Solids. J Phys Chem A 2024; 128:4288-4296. [PMID: 38748612 DOI: 10.1021/acs.jpca.4c01866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
We report solid-state 1H and 17O NMR results for four 17O-labeled organic compounds each containing an extensive carboxyl-bridged hydrogen bond (CBHB) network in the crystal lattice: tetrabutylammonium hydrogen di-[17O2]salicylate (1), [17O4]quinolinic acid (2), [17O4]dinicotinic acid (3), and [17O2]Gly/[17O2]Gly·HCl cocrystal (4). The 1H isotropic chemical shifts found for protons involved in different CBHB networks are between 8.2 and 20.5 ppm, which reflect very different hydrogen-bonding environments. Similarly, the 17O isotropic chemical shifts found for the carboxylate oxygen atoms in CBHB networks, spanning a large range between 166 and 341 ppm, are also remarkably sensitive to the hydrogen-bonding environments. We introduced a simple graphical representation in which 1H and 17O chemical shifts are displayed along the H and O atomic chains that form the CBHB network. In such a depiction, because wavy patterns are often observed, we refer to these wavy patterns as 1H/17O chemical shift waves. Typical patterns of 1H/17O chemical shift waves in CBHB networks are discussed. The reported 1H and 17O NMR parameters for the CBHB network models examined in this study can serve as benchmarks to aid in spectral interpretation for CBHB networks in proteins.
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Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston Ontario K7L 3N6, Canada
| | - Yizhe Dai
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston Ontario K7L 3N6, Canada
| | - Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Victor Terskikh
- Metrology, National Research Council Canada, Ottawa K1A 0R6, Canada
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2
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Fu R, Ramamoorthy A. 17O Solid-State NMR Spectroscopy of Lipid Membranes. J Phys Chem B 2024; 128:3527-3537. [PMID: 38568422 DOI: 10.1021/acs.jpcb.4c01016] [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: 04/19/2024]
Abstract
Despite the limitations posed by poor sensitivity, studies have reported the unique advantages of 17O based NMR spectroscopy to study systems existing in liquid, solid, or semisolid states. 17O NMR studies have exploited the remarkable sensitivity of quadrupole coupling and chemical shift anisotropy tensors to the local environment in the characterization of a variety of intra- and intermolecular interactions and motion. Recent studies have considerably expanded the use of 17O NMR to study dynamic intermolecular interactions associated with some of the challenging biological systems under magic angle spinning (MAS) and aligned conditions. The very fast relaxing nature of 17O has been well utilized in cellular and in vivo MRS (magnetic resonance spectroscopy) and MRI (magnetic resonance imaging) applications. The main focus of this Review is to highlight the new developments in the biological solids with a detailed discussion for a few selected examples including membrane proteins and nanodiscs. In addition to the unique benefits and limitations, the remaining challenges to overcome, and the impacts of higher magnetic fields and sensitivity enhancement techniques are discussed.
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Affiliation(s)
- Riqiang Fu
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Ayyalusamy Ramamoorthy
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
- Department of Chemical and Biomedical Engineering, Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida 32310, United States
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3
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Halbig CE, Mukherjee B, Eigler S, Garaj S. Origin of Oxygen in Graphene Oxide Revealed by 17O and 18O Isotopic Labeling. J Am Chem Soc 2024; 146:7431-7438. [PMID: 38446768 PMCID: PMC10958498 DOI: 10.1021/jacs.3c12543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 03/08/2024]
Abstract
Wet-chemical oxidation of graphite in a mixture of sulfuric acid with a strong oxidizer, such as potassium permanganate, leads to the formation of graphene oxide with hydroxyl and epoxide groups as the major functional groups. Nevertheless, the reaction mechanism remains unclear and the source of oxygen is a subject of debate. It could theoretically originate from the oxidizer, water, or sulfuric acid. In this study, we employed 18O and 17O labeled reagents to experimentally elucidate the reaction mechanism and, thus, determine the origin of oxo-functional groups. Our findings reveal the multifaceted roles of sulfuric acid, acting as a dispersion medium, a dehydrating agent for potassium permanganate, and an intercalant. Additionally, it significantly acts as a source of oxygen next to manganese oxides. Through 17O solid-state magic-angle spinning (MAS) NMR experiments, we exclude water as a direct reaction partner during oxygenation. With labeling experiments, we conclude on mechanistic insights, which may be exploited for the synthesis of novel graphene derivatives.
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Affiliation(s)
- Christian E. Halbig
- Department
of Chemistry, Biology and Pharmacy, Freie
Universität Berlin, 14195 Berlin, Germany
- Department
of Physics, Faculty of Science, National
University of Singapore, 117551 Singapore, Singapore
| | - Bristy Mukherjee
- Department
of Materials Science and Engineering, National
University of Singapore, 117575 Singapore, Singapore
| | - Siegfried Eigler
- Department
of Chemistry, Biology and Pharmacy, Freie
Universität Berlin, 14195 Berlin, Germany
| | - Slaven Garaj
- Department
of Materials Science and Engineering, National
University of Singapore, 117575 Singapore, Singapore
- Department
of Physics, Faculty of Science, National
University of Singapore, 117551 Singapore, Singapore
- Department
of Biomedical Engineering, National University
of Singapore, 117583 Singapore, Singapore
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4
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Filippov A, Antzutkin ON. State of anion in ethylammonium nitrate enclosed between micrometer-spaced glass plates as studied by 17O and 15N NMR. Phys Chem Chem Phys 2023; 25:14538-14545. [PMID: 37191082 DOI: 10.1039/d3cp01737k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Some aprotic and protic ionic liquids (ILs) containing nitrate anion demonstrate unusual dynamic behavior of cations when these ILs are enclosed in micrometer-spaced layers between glass plates. We applied 17O and 15N NMR spectroscopy to discover the state and transformations of 17O and 15N isotopically enriched nitrate anion of ethylammonium nitrate (EAN) enclosed between glass plates. 15N NMR spectra demonstrated preferential orientation of the principal axes of the nitrate anions perpendicular to the normal of the glass surface. Therefore, isotropic ionic liquid EAN, when placed within a micrometer-spaced enclosure, forms an ordered phase, which is similar to a liquid crystal. The peculiarity of this phase is that the cations do not have a predominant orientation. Other features of this phase that are typical for liquid crystal phases are the changed local and translational dynamics in comparison with the isotropic state and slow transformation occurring under the action of an external magnetic field.
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Affiliation(s)
- Andrei Filippov
- Chemistry of Interfaces, Luleå University of Technology, SE-97187 Luleå, Sweden.
| | - Oleg N Antzutkin
- Chemistry of Interfaces, Luleå University of Technology, SE-97187 Luleå, Sweden.
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5
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Brouwer DH, Mikolajewski JG. A combined solid-state NMR and quantum chemical calculation study of hydrogen bonding in two forms of α-d-glucose. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2023; 123:101848. [PMID: 36584544 DOI: 10.1016/j.ssnmr.2022.101848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Hydrogen bonding plays an important role in the structure and function of a wide range of materials. Solid-state 1H nuclear magnetic resonance (NMR) spectroscopy provides a very sensitive tool to investigate the local structure of hydrogen atoms involved in hydrogen bonding. While there is extensive 1H solid-state NMR data on O-H - - O hydrogen bonding in solid carboxylic acids, there has been no systematic 1H solid-state NMR studies of hydroxyl groups in carbohydrates (and hydroxyl groups in general). With a view to studying the hydrogen bonding in more complex materials such as cellulose polymorphs, we carried out a detailed solid-state 1H NMR investigation of the model compounds α-d-glucose and α-d-glucose monohydrate. Through a combination of fast magic-angle spinning (MAS), combined rotation and multiple pulse spectroscopy (CRAMPS), and two-dimensional (2D) correlation experiments carried out at ultrahigh magnetic fields, it was possible to assign all of the aliphatic (CH), hydroxyl (OH), and water (H2O) 1H chemical shifts in both forms of α-d-glucose. Plane-wave DFT calculations were employed to improve the hydrogen atom positions for α-d-glucose monohydrate and to calculate 1H chemical shifts, providing additional support for the experimentally determined peak assignments. Finally, the relationship between the hydroxyl 1H chemical shifts and their hydrogen bonding geometry was investigated and compared to the well-established relationship for carboxylic acid protons.
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Affiliation(s)
- Darren H Brouwer
- Department of Chemistry, Redeemer University, Ancaster, ON, L9K 1J4, Canada.
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6
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McCalpin SD, Fu R, Ravula T, Wu G, Ramamoorthy A. Magnetically aligned nanodiscs enable direct measurement of 17O residual quadrupolar coupling for small molecules. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 346:107341. [PMID: 36473327 DOI: 10.1016/j.jmr.2022.107341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/17/2022] [Accepted: 11/18/2022] [Indexed: 06/17/2023]
Abstract
The use of 17O in NMR spectroscopy for structural studies has been limited due to its low natural abundance, low gyromagnetic ratio, and quadrupolar relaxation. Previous solution 17O work has primarily focused on studies of liquids where the 17O quadrupolar coupling is averaged to zero by isotropic molecular tumbling, and therefore has ignored the structural information contained in this parameter. Here, we use magnetically aligned polymer nanodiscs as an alignment medium to measure residual quadrupolar couplings (RQCs) for 17O-labelled benzoic acid in the aqueous phase. We show that increasing the magnetic field strength improves spectral sensitivity and resolution and that each satellite peak of the expected pentet pattern resolves clearly at 18.8 T. We observed no significant dependence of the RQC magnitudes on the magnetic field strength. However, changing the orientation of the alignment medium alters the RQC by a consistent factor, suggesting that 17O RQCs measured in this way can provide reliable orientational information for elucidations of molecular structures.
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Affiliation(s)
- Samuel D McCalpin
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Riqiang Fu
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - Thirupathi Ravula
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA; Biophysics, Biomedical Engineering, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Gang Wu
- Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA; Biophysics, Biomedical Engineering, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
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7
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Edgar M, Kuhn S, Page G, Grootveld M. Computational simulation of 1 H NMR profiles of complex biofluid analyte mixtures at differential operating frequencies: Applications to low-field benchtop spectra. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022; 60:1097-1112. [PMID: 34847251 DOI: 10.1002/mrc.5236] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 10/30/2021] [Accepted: 11/23/2021] [Indexed: 06/13/2023]
Abstract
Estimations of accurate and reliable NMR chemical shift values, coupling patterns and constants within a reasonable timeframe remain significantly challenging, and the unavailability of reliable software strategies for the prediction of low-field (e.g., 60 MHz) spectra from those acquired at higher operating frequencies hampers their direct comparison. Hence, this study explored the applications of accessible software options for predicting these parameters in the 1 H NMR profiles of analytes as a function of magnetic field strength; this was performed for individual analytes and also for complex biofluid matrices featured in metabolomics investigations. For this purpose, results from the very first successful experimental acquisition and simulation of the 1 H NMR profiles of intact human salivary supernatant samples on a 60 MHz benchtop spectrometer were evaluated. Using salivary metabolite concentrations determined at 400 MHz, it was demonstrated that simulation of the low-field spectra of five biomolecules with the most prominent 1 H resonances detectable allowed multiple component fits to be applied to experimental spectra. Hence, these salivary 1 H NMR profiles could be successfully predicted throughout the 45-600 MHz operating frequency range. With the exception of propionate resonance multiplets, which revealed more complex coupling patterns at low field and required more astute computational and fitting options, valuable quantitative metabolomics data on salivary acetate, formate, methanol and glycine could be attained from low-field spectrometres. These studies are both timely and pertinent in view of the recent advancement of low-field benchtop NMR facilities for diagnostically significant biomarker tracking in biofluids. Experiments performed with added ammonium chloride to facilitate the release of salivary metabolites from biopolymer binding sites provided evidence that a small but nevertheless significant proportion of propionate, but not lactate, was bound to such sites, an observation of much relevance to biomolecule quantification in salivary metabolomics investigations.
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Affiliation(s)
- Mark Edgar
- Department of Chemistry, University of Loughborough, Loughborough, UK
| | - Stefan Kuhn
- School of Computer Science and Informatics, De Montfort University, Leicester, UK
| | - Georgina Page
- Leicester School of Pharmacy, De Montfort University, Leicester, UK
| | - Martin Grootveld
- Leicester School of Pharmacy, De Montfort University, Leicester, UK
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8
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Shen J, Terskikh V, Struppe J, Hassan A, Monette M, Hung I, Gan Z, Brinkmann A, Wu G. Solid-state 17O NMR study of α-d-glucose: exploring new frontiers in isotopic labeling, sensitivity enhancement, and NMR crystallography. Chem Sci 2022; 13:2591-2603. [PMID: 35340864 PMCID: PMC8890099 DOI: 10.1039/d1sc06060k] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 12/31/2021] [Indexed: 01/03/2023] Open
Abstract
We report the first “total synthesis” of 17O-labeled d-glucose and its solid-state 17O NMR characterization with unprecedented sensitivity and resolution.
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Affiliation(s)
- Jiahui Shen
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
| | - Victor Terskikh
- Metrology, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Jochem Struppe
- Bruker Biospin Corporation, 15 Fortune Drive, Billerica, MA 01821, USA
| | - Alia Hassan
- Bruker Switzerland AG, Fällanden, Switzerland
| | - Martine Monette
- Bruker Biospin Ltd., 2800 High Point Drive, Suite 206, Milton, Ontario L9T 6P4, Canada
| | - Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Andreas Brinkmann
- Metrology, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
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9
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Theoretical Investigation of Glycine Micro-Solvated. Energy and NMR Spin Spin Coupling Constants Calculations. SCI 2021. [DOI: 10.3390/sci3040041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Glycine in its neutral form can exist in the gas phase while its zwitterion form is more stable in water solution, but how many waters are actually necessary to stabilize the zwitterionic structure in the gas phase? Are the intramolecular isotropic spin spin coupling constants sensitive enough to accuse the change in the environment? or the conformer observed? These and related questions have been investigated by a computational study at the level of density functional theory employing the B3LYP functional and the 6-31++G**-J basis set. We found that at least two water molecules explicitly accounted for in the super-molecule structure are necessary to stabilize both conformers of glycine within a water polarizable continuum model. At least half of the SSCCs of both conformers are very stable to changes in the environment and at least four of them differ significantly between Neutral and Zwitterion conformation.
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10
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Hung I, Gan Z, Wu G. Two- and Three-Dimensional 13C- 17O Heteronuclear Correlation NMR Spectroscopy for Studying Organic and Biological Solids. J Phys Chem Lett 2021; 12:8897-8902. [PMID: 34498879 DOI: 10.1021/acs.jpclett.1c02465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We report two- and three-dimensional (2D and 3D) 13C-17O heteronuclear correlation solid-state NMR experiments under magic-angle spinning (MAS) conditions. These experiments utilize the D-RINEPT (Dipolar-mediated Refocused Insensitive Nuclei Enhanced by Polarization Transfer) scheme with symmetry-based SR412 recoupling blocks for coherence transfer between 13C and 17O nuclei. First, a 2D 17O → 13C correlation experiment was performed for the [1-13C,17O]-Gly/Gly·HCl cocrystal and [U-13C, 1-17O]-α/β-d-glucose samples. Second, a 2D 17O → 13C MQ-D-RINEPT correlation experiment where the indirect dimension incorporates the multiple-quantum MAS (MQMAS) scheme was tested for obtaining isotropic 17O resolution with [U-13C, 1-17O]-α/β-d-glucose. Third, a new 3D 17O → 13C → 13C correlation experiment was demonstrated where 17O → 13C and 13C → 13C correlations are achieved by D-RINEPT and DARR (Dipolar Assisted Rotational Resonance) sequences, respectively (thus termed as a 3D D-RINEPT/DARR OCC experiment). This new 3D 17O NMR experiment is implemented with the aim for site-resolved solid-state 17O NMR studies.
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Affiliation(s)
- Ivan Hung
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Zhehong Gan
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
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11
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Rowlands LJ, Marks A, Sanderson JM, Law RV. 17O NMR spectroscopy as a tool to study hydrogen bonding of cholesterol in lipid bilayers. Chem Commun (Camb) 2021; 56:14499-14502. [PMID: 33150883 DOI: 10.1039/d0cc05466f] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cholesterol is a crucial component of biological membranes and can interact with other membrane components through hydrogen bonding. NMR spectroscopy has been used previously to investigate this bonding, however this study represents the first 17O NMR spectroscopy study of isotopically enriched cholesterol. We demonstrate the 17O chemical shift is dependent on hydrogen bonding, providing a novel method for the study of cholesterol in bilayers.
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Affiliation(s)
- Lucy J Rowlands
- Institute of Chemical Biology, Imperial College London, Molecular Sciences Research Hub, W12 0BZ London, UK.
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12
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Characterization of the ionic liquid obtained by chlorosulfonation of 1-methylimidazole: 1-methyl-3-sulfonic acid imidazolium chloride, 1-methylimidazolium chlorosulfate or a zwitterionic salt? J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115276] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Klein BA, Tkachuk DG, Terskikh VV, Michaelis VK. Expanding the NMR toolkit for biological solids: oxygen-17 enriched Fmoc-amino acids. NEW J CHEM 2021. [DOI: 10.1039/d1nj02847b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We report the solid-state 17O NMR parameters for five previously uncharacterized N-α-fluoren-9-yl-methoxycarbonyl-O-t-butyl (Fmoc) protected amino acids.
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14
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Rinald A, Wu G. A Modified Townes-Dailey Model for Interpretation and Visualization of Nuclear Quadrupole Coupling Tensors in Molecules. J Phys Chem A 2020; 124:1176-1186. [PMID: 31968940 DOI: 10.1021/acs.jpca.0c00439] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We propose a modified Townes-Dailey (TD) model to help interpret and visualize experimentally measurable nuclear quadrupole coupling tensors (thus the electric field gradient tensors) in molecules. We show that within the framework of the TD model each principal component of the nuclear quadrupole coupling tensor is directly related to a new quantity termed as the valence p-orbital population anisotropy (VPPA or ΔP) in the same direction. Although the proposed model is a simple reformulation of the original TD model thus does not introduce new physics, the concept of VPPA makes it possible to directly interpret as well as visualize in a much straightforward way the experimentally determined nuclear quadrupole coupling tensors in molecules. We illustrate the utilization of VPPA using nuclear quadrupole coupling tensors for 11B, 14N, 17O, 35Cl, 79Br, and 127I nuclei in a variety of molecules. We propose to use VPPA or ΔP ellipsoid representation as a means of visualizing/displaying nuclear quadrupole coupling tensors in the molecular frame. We show the usefulness of the VPPA concept in providing a unifying explanation for seemingly different types of molecular interactions such as hydrogen bonding, halogen bonding, and frustrated Lewis pairs. We further suggest that VPPA can be used as a universal measure of the ability of any element in the entire p-block of the periodic table (groups 13-16) to interact with nucleophiles (e.g., formation of chalcogen, pnictogen, tetrel, and triel bonds).
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Affiliation(s)
- Andrew Rinald
- Department of Chemistry , Queen's University , 90 Bader Lane , Kingston , Ontario , Canada K7L 3N6
| | - Gang Wu
- Department of Chemistry , Queen's University , 90 Bader Lane , Kingston , Ontario , Canada K7L 3N6
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15
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Rees GJ, Day SP, Barnsley KE, Iuga D, Yates JR, Wallis JD, Hanna JV. Measuring multiple 17O–13C J-couplings in naphthalaldehydic acid: a combined solid state NMR and density functional theory approach. Phys Chem Chem Phys 2020; 22:3400-3413. [DOI: 10.1039/c9cp03977e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined multinuclear solid-state NMR and a density functional theory computational approach, with SIMPSON simulations, is evaluated to determine the four heteronuclear 1J(13C,17O) couplings in naphthalaldehydic acid.
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Affiliation(s)
| | | | | | - Dinu Iuga
- Department of Physics
- University of Warwick
- Coventry
- UK
| | | | - John D. Wallis
- School of Science and Technology
- Nottingham Trent University
- Nottingham
- UK
| | - John V. Hanna
- Department of Physics
- University of Warwick
- Coventry
- UK
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16
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Wu G. 17O NMR studies of organic and biological molecules in aqueous solution and in the solid state. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2019; 114-115:135-191. [PMID: 31779879 DOI: 10.1016/j.pnmrs.2019.06.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/11/2019] [Accepted: 06/11/2019] [Indexed: 06/10/2023]
Abstract
This review describes the latest developments in the field of 17O NMR spectroscopy of organic and biological molecules both in aqueous solution and in the solid state. In the first part of the review, a general theoretical description of the nuclear quadrupole relaxation process in isotropic liquids is presented at a mathematical level suitable for non-specialists. In addition to the first-order quadrupole interaction, the theory also includes additional relaxation mechanisms such as the second-order quadrupole interaction and its cross correlation with shielding anisotropy. This complete theoretical treatment allows one to assess the transverse relaxation rate (thus the line width) of NMR signals from half-integer quadrupolar nuclei in solution over the entire range of motion. On the basis of this theoretical framework, we discuss general features of quadrupole-central-transition (QCT) NMR, which is a particularly powerful method of studying biomolecules in the slow motion regime. Then we review recent advances in 17O QCT NMR studies of biological macromolecules in aqueous solution. The second part of the review is concerned with solid-state 17O NMR studies of organic and biological molecules. As a sequel to the previous review on the same subject [G. Wu, Prog. Nucl. Magn. Reson. Spectrosc. 52 (2008) 118-169], the current review provides a complete coverage of the literature published since 2008 in this area.
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Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada.
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17
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Wu G, Hung I, Gan Z, Terskikh V, Kong X. Solid-State 17O NMR Study of Carboxylic Acid Dimers: Simultaneously Accessing Spectral Properties of Low- and High-Energy Tautomers. J Phys Chem A 2019; 123:8243-8253. [DOI: 10.1021/acs.jpca.9b07224] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
| | - Ivan Hung
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Zhehong Gan
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Victor Terskikh
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Xianqi Kong
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
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18
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Carnahan SL, Lampkin BJ, Naik P, Hanrahan MP, Slowing II, VanVeller B, Wu G, Rossini AJ. Probing O–H Bonding through Proton Detected 1H–17O Double Resonance Solid-State NMR Spectroscopy. J Am Chem Soc 2018; 141:441-450. [DOI: 10.1021/jacs.8b10878] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Scott L. Carnahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Bryan J. Lampkin
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Pranjali Naik
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Michael P. Hanrahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Igor I. Slowing
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Brett VanVeller
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Gang Wu
- Department of Chemistry, Queen’s University, Kingston, Ontario, Canada K7L 3N6
| | - Aaron J. Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
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19
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Gupta R, Stringer J, Struppe J, Rehder D, Polenova T. Direct detection and characterization of bioinorganic peroxo moieties in a vanadium complex by 17O solid-state NMR and density functional theory. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2018; 91:15-20. [PMID: 29506770 PMCID: PMC6267778 DOI: 10.1016/j.ssnmr.2018.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/06/2018] [Accepted: 02/07/2018] [Indexed: 06/08/2023]
Abstract
Electronic and structural properties of short-lived metal-peroxido complexes, which are key intermediates in many enzymatic reactions, are not fully understood. While detected in various enzymes, their catalytic properties remain elusive because of their transient nature, making them difficult to study spectroscopically. We integrated 17O solid-state NMR and density functional theory (DFT) to directly detect and characterize the peroxido ligand in a bioinorganic V(V) complex mimicking intermediates non-heme vanadium haloperoxidases. 17O chemical shift and quadrupolar tensors, measured by solid-state NMR spectroscopy, probe the electronic structure of the peroxido ligand and its interaction with the metal. DFT analysis reveals the unusually large chemical shift anisotropy arising from the metal orbitals contributing towards the magnetic shielding of the ligand. The results illustrate the power of an integrated approach for studies of oxygen centers in enzyme reaction intermediates.
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Affiliation(s)
- Rupal Gupta
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA.
| | - John Stringer
- PhoenixNMR, 4921 Eagle Lake Drive, Fort Collins, CO, USA
| | | | - Dieter Rehder
- Department of Chemistry, University of Hamburg, D-20146, Hamburg, Germany
| | - Tatyana Polenova
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA.
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20
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Venkatesh A, Hanrahan MP, Rossini AJ. Proton detection of MAS solid-state NMR spectra of half-integer quadrupolar nuclei. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:171-181. [PMID: 28392024 DOI: 10.1016/j.ssnmr.2017.03.005] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 03/25/2017] [Accepted: 03/28/2017] [Indexed: 05/09/2023]
Abstract
Fast magic angle spinning (MAS) and proton detection has found widespread application to enhance the sensitivity of solid-state NMR experiments with spin-1/2 nuclei such as 13C, 15N and 29Si, however, this approach is not yet routinely applied to half-integer quadrupolar nuclei. Here we have investigated the feasibility of using fast MAS and proton detection to enhance the sensitivity of solid-state NMR experiments with half-integer quadrupolar nuclei. The previously described dipolar hetero-nuclear multiple quantum correlation (D-HMQC) and dipolar refocused insensitive nuclei enhanced by polarization transfer (D-RINEPT) pulse sequences were used for proton detection of half-integer quadrupolar nuclei. Quantitative comparisons of signal-to-noise ratios and the sensitivity of proton detected D-HMQC and D-RINEPT and direct detection spin echo and quadrupolar Carr-Purcell Meiboom-Gill (QCPMG) solid-state NMR spectra, demonstrate that one dimensional proton detected experiments can provide sensitivity similar to or exceeding that obtainable with direct detection QCPMG experiments. 2D D-HMQC and D-RINEPT experiments provide less sensitivity than QCPMG experiments but proton detected 2D hetero-nuclear correlation solid-state NMR spectra of half-integer nuclei can still be acquired in about the same time as a 1D spin echo spectrum. Notably, the rarely used D-RINEPT pulse sequence is found to provide similar, or better sensitivity than D-HMQC in some cases. Proton detected D-RINEPT benefits from the short longitudinal relaxation times (T1) normally associated with half-integer quadrupolar nuclei, it can be combined with existing signal enhancement methods for quadrupolar nuclei, and t1-noise in the indirect dimension can easily be removed by pre-saturation of the 1H nuclei. The rapid acquisition of proton detected 2D HETCOR solid-state NMR spectra of a range of half-integer quadrupolar nuclei such as 17O, 27Al, 35Cl and 71Ga is demonstrated.
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Affiliation(s)
- Amrit Venkatesh
- Iowa State University, Department of Chemistry, Ames, IA 50011, USA; US DOE Ames Laboratory, Ames, IA 50011, USA
| | - Michael P Hanrahan
- Iowa State University, Department of Chemistry, Ames, IA 50011, USA; US DOE Ames Laboratory, Ames, IA 50011, USA
| | - Aaron J Rossini
- Iowa State University, Department of Chemistry, Ames, IA 50011, USA; US DOE Ames Laboratory, Ames, IA 50011, USA.
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21
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Kong X, Dai Y, Wu G. Solid-state 17O NMR study of 2-acylbenzoic acids and warfarin. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:59-64. [PMID: 28057400 DOI: 10.1016/j.ssnmr.2016.12.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 12/14/2016] [Accepted: 12/16/2016] [Indexed: 06/06/2023]
Abstract
We report synthesis and solid-state 17O NMR characterization of four site-specifically 17O-labeled 2-acylbenzoic acids (2-RC(O)C6H4COOH) where R=H and CH3): 2-[3-17O]formylbenzoic acid, 2-[1,2-17O2]formylbenzoic acid, 2-[3-17O]acetylbenzoic acid, and 2-[1,2,3-17O3]acetylbenzoic acid. In the solid state, both 2-formyl- and 2-acetyl-benzoic acids exist as the cyclic phthalide form each containing a five-membered lactone ring and a cyclic hemiacetal/hemiketal group. Static and magic-angle-spinning 17O NMR spectra were recorded at 14.1 and 21.1T for these compounds, from which the 17O chemical shift and nuclear quadrupolar coupling tensors were determined for each oxygen site. These results represent the first time that 17O NMR tensors are fully characterized for lactone, cyclic hemiacetal, and cyclic hemiketal functional groups. We also report solid-state 17O NMR data for the cyclic hemiketal group an anticoagulant drug, warfarin. Experimental 17O NMR tensors in these compounds were compared with computational results obtained with a periodic DFT code BAND.
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Affiliation(s)
- Xianqi Kong
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
| | - Yizhe Dai
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
| | - Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6.
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22
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Holmes ST, Iuliucci RJ, Mueller KT, Dybowski C. Semi-empirical refinements of crystal structures using 17O quadrupolar-coupling tensors. J Chem Phys 2017; 146:064201. [DOI: 10.1063/1.4975170] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- Sean T. Holmes
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
| | - Robbie J. Iuliucci
- Department of Chemistry, Washington and Jefferson College, Washington, Pennsylvania 15301, USA
| | - Karl T. Mueller
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, USA
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Cecil Dybowski
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
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23
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Hartman J, Day GM, Beran GJO. Enhanced NMR Discrimination of Pharmaceutically Relevant Molecular Crystal Forms through Fragment-Based Ab Initio Chemical Shift Predictions. CRYSTAL GROWTH & DESIGN 2016; 16:6479-6493. [PMID: 27829821 PMCID: PMC5095663 DOI: 10.1021/acs.cgd.6b01157] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 09/09/2016] [Indexed: 05/10/2023]
Abstract
Chemical shift prediction plays an important role in the determination or validation of crystal structures with solid-state nuclear magnetic resonance (NMR) spectroscopy. One of the fundamental theoretical challenges lies in discriminating variations in chemical shifts resulting from different crystallographic environments. Fragment-based electronic structure methods provide an alternative to the widely used plane wave gauge-including projector augmented wave (GIPAW) density functional technique for chemical shift prediction. Fragment methods allow hybrid density functionals to be employed routinely in chemical shift prediction, and we have recently demonstrated appreciable improvements in the accuracy of the predicted shifts when using the hybrid PBE0 functional instead of generalized gradient approximation (GGA) functionals like PBE. Here, we investigate the solid-state 13C and 15N NMR spectra for multiple crystal forms of acetaminophen, phenobarbital, and testosterone. We demonstrate that the use of the hybrid density functional instead of a GGA provides both higher accuracy in the chemical shifts and increased discrimination among the different crystallographic environments. Finally, these results also provide compelling evidence for the transferability of the linear regression parameters mapping predicted chemical shieldings to chemical shifts that were derived in an earlier study.
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Affiliation(s)
- Joshua
D. Hartman
- Department
of Chemistry, University of California, Riverside, California 92521 United States
| | - Graeme M. Day
- School
of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - Gregory J. O. Beran
- Department
of Chemistry, University of California, Riverside, California 92521 United States
- E-mail:
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24
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Hartman JD, Kudla RA, Day GM, Mueller LJ, Beran GJO. Benchmark fragment-based (1)H, (13)C, (15)N and (17)O chemical shift predictions in molecular crystals. Phys Chem Chem Phys 2016; 18:21686-709. [PMID: 27431490 DOI: 10.1039/c6cp01831a] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The performance of fragment-based ab initio(1)H, (13)C, (15)N and (17)O chemical shift predictions is assessed against experimental NMR chemical shift data in four benchmark sets of molecular crystals. Employing a variety of commonly used density functionals (PBE0, B3LYP, TPSSh, OPBE, PBE, TPSS), we explore the relative performance of cluster, two-body fragment, and combined cluster/fragment models. The hybrid density functionals (PBE0, B3LYP and TPSSh) generally out-perform their generalized gradient approximation (GGA)-based counterparts. (1)H, (13)C, (15)N, and (17)O isotropic chemical shifts can be predicted with root-mean-square errors of 0.3, 1.5, 4.2, and 9.8 ppm, respectively, using a computationally inexpensive electrostatically embedded two-body PBE0 fragment model. Oxygen chemical shieldings prove particularly sensitive to local many-body effects, and using a combined cluster/fragment model instead of the simple two-body fragment model decreases the root-mean-square errors to 7.6 ppm. These fragment-based model errors compare favorably with GIPAW PBE ones of 0.4, 2.2, 5.4, and 7.2 ppm for the same (1)H, (13)C, (15)N, and (17)O test sets. Using these benchmark calculations, a set of recommended linear regression parameters for mapping between calculated chemical shieldings and observed chemical shifts are provided and their robustness assessed using statistical cross-validation. We demonstrate the utility of these approaches and the reported scaling parameters on applications to 9-tert-butyl anthracene, several histidine co-crystals, benzoic acid and the C-nitrosoarene SnCl2(CH3)2(NODMA)2.
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Affiliation(s)
- Joshua D Hartman
- Department of Chemistry, University of California, Riverside, California 92521, USA.
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25
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de la Calle Arregui C, Purdie JA, Haslam CA, Law RV, Sanderson JM. Optimised conditions for the synthesis of 17O and 18O labelled cholesterol. Chem Phys Lipids 2016; 195:58-62. [DOI: 10.1016/j.chemphyslip.2015.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 11/30/2015] [Accepted: 12/17/2015] [Indexed: 10/22/2022]
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26
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Wu G. Solid-State ¹⁷O NMR studies of organic and biological molecules: Recent advances and future directions. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2016; 73:1-14. [PMID: 26651417 DOI: 10.1016/j.ssnmr.2015.11.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Revised: 11/20/2015] [Accepted: 11/24/2015] [Indexed: 05/04/2023]
Abstract
This Trends article highlights the recent advances published between 2012 and 2015 in solid-state (17)O NMR for organic and biological molecules. New developments in the following areas are described: (1) new oxygen-containing functional groups, (2) metal organic frameworks, (3) pharmaceuticals, (4) probing molecular motion in organic solids, (5) dynamic nuclear polarization, and (6) paramagnetic coordination compounds. For each of these areas, the author offers his personal views on important problems to be solved and possible future directions.
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Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
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27
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Rorick A, Michael MA, Yang L, Zhang Y. Toward Relatively General and Accurate Quantum Chemical Predictions of Solid-State (17)O NMR Chemical Shifts in Various Biologically Relevant Oxygen-Containing Compounds. J Phys Chem B 2015; 119:11618-25. [PMID: 26274812 PMCID: PMC4583422 DOI: 10.1021/acs.jpcb.5b06536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oxygen is an important element in most biologically significant molecules, and experimental solid-state (17)O NMR studies have provided numerous useful structural probes to study these systems. However, computational predictions of solid-state (17)O NMR chemical shift tensor properties are still challenging in many cases, and in particular, each of the prior computational works is basically limited to one type of oxygen-containing system. This work provides the first systematic study of the effects of geometry refinement, method, and basis sets for metal and nonmetal elements in both geometry optimization and NMR property calculations of some biologically relevant oxygen-containing compounds with a good variety of XO bonding groups (X = H, C, N, P, and metal). The experimental range studied is of 1455 ppm, a major part of the reported (17)O NMR chemical shifts in organic and organometallic compounds. A number of computational factors toward relatively general and accurate predictions of (17)O NMR chemical shifts were studied to provide helpful and detailed suggestions for future work. For the studied kinds of oxygen-containing compounds, the best computational approach results in a theory-versus-experiment correlation coefficient (R(2)) value of 0.9880 and a mean absolute deviation of 13 ppm (1.9% of the experimental range) for isotropic NMR shifts and an R(2) value of 0.9926 for all shift-tensor properties. These results shall facilitate future computational studies of (17)O NMR chemical shifts in many biologically relevant systems, and the high accuracy may also help the refinement and determination of active-site structures of some oxygen-containing substrate-bound proteins.
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Affiliation(s)
- Amber Rorick
- Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, 1 Castle Point on Hudson, Hoboken NJ 07030, USA
| | - Matthew A. Michael
- Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, 1 Castle Point on Hudson, Hoboken NJ 07030, USA
| | - Liu Yang
- Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, 1 Castle Point on Hudson, Hoboken NJ 07030, USA
| | - Yong Zhang
- Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, 1 Castle Point on Hudson, Hoboken NJ 07030, USA
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28
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Kong X, Terskikh V, Toubaei A, Wu G. A solid-state 17O NMR study of platinum-carboxylate complexes: carboplatin and oxaliplatin. CAN J CHEM 2015. [DOI: 10.1139/cjc-2015-0019] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report synthesis and solid-state NMR characterization of two 17O-labeled platinum anticancer drugs: cis-diammine(1,1-cyclobutane-[17O4]dicarboxylato)platinum(II) (carboplatin) and ([17O4]oxalato)[(1R, 2R)-(−)-1,2-cyclohexanediamine)]platinum(II) (oxaliplatin). Both 17O chemical shift (CS) and quadrupolar coupling (QC) tensors were measured for the carboxylate groups in these two compounds. With the aid of plane wave DFT computations, the 17O CS and QC tensor orientations were determined in the molecular frame of reference. Significant changes in the 17O CS and QC tensors were observed for the carboxylate oxygen atom upon its coordination to Pt(II). In particular, the 17O isotropic chemical shifts for the oxygen atoms directly bonded to Pt(II) are found to be smaller (more shielded) by 200 ppm than those for the non-Pt-coordinated oxygen atoms within the same carboxylate group. Examination of the 17O CS tensor components reveals that such a large 17O coordination shift is primarily due to the shielding increase along the direction that is within the O=C–O–Pt plane and perpendicular to the O–Pt bond. This result is interpreted as due to the σ donation from the oxygen nonbonding orbital (electron lone pair) to the Pt(II) empty dyz orbital, which results in large energy gaps between σ(Pt–O) and unoccupied molecular orbitals, thus reducing the paramagnetic shielding contribution along the direction perpendicular to the O–Pt bond. We found that the 17O QC tensor of the carboxylate oxygen is also sensitive to Pt(II) coordination, and that 17O CS and QC tensors provide complementary information about the O–Pt bonding.
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Affiliation(s)
- Xianqi Kong
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Victor Terskikh
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
- Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Abouzar Toubaei
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Gang Wu
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
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29
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Michaelis VK, Keeler EG, Ong TC, Craigen KN, Penzel S, Wren JEC, Kroeker S, Griffin RG. Structural Insights into Bound Water in Crystalline Amino Acids: Experimental and Theoretical (17)O NMR. J Phys Chem B 2015; 119:8024-36. [PMID: 25996165 PMCID: PMC4894719 DOI: 10.1021/acs.jpcb.5b04647] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We demonstrate here that the (17)O NMR properties of bound water in a series of amino acids and dipeptides can be determined with a combination of nonspinning and magic-angle spinning experiments using a range of magnetic field strengths from 9.4 to 21.1 T. Furthermore, we propose a (17)O chemical shift fingerprint region for bound water molecules in biological solids that is well outside the previously determined ranges for carbonyl, carboxylic, and hydroxyl oxygens, thereby offering the ability to resolve multiple (17)O environments using rapid one-dimensional NMR techniques. Finally, we compare our experimental data against quantum chemical calculations using GIPAW and hybrid-DFT, finding intriguing discrepancies between the electric field gradients calculated from structures determined by X-ray and neutron diffraction.
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Affiliation(s)
- Vladimir K. Michaelis
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139 USA
| | - Eric G. Keeler
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139 USA
| | - Ta-Chung Ong
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139 USA
| | - Kimberley N. Craigen
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada
| | - Susanne Penzel
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139 USA
| | - John E. C. Wren
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada
| | - Scott Kroeker
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada
| | - Robert G. Griffin
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139 USA
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30
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Kong X, Tang A, Wang R, Ye E, Terskikh V, Wu G. Are the amide bonds in N-acyl imidazoles twisted? A combined solid-state 17O NMR, crystallographic, and computational study. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0397] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report synthesis of 17O-labeling and solid-state 17O NMR measurements of three N-acyl imidazoles of the type R-C(17O)-Im: R = p-methoxycinnamoyl (MCA-Im), R = 4-(dimethylamino)benzoyl (DAB-Im), and R = 2,4,6-trimethylbenzoyl (TMB-Im). Solid-state 17O NMR experiments allowed us to determine for the first time the 17O quadrupole coupling and chemical shift tensors in this class of organic compounds. We also determined the crystal structures of these compounds using single-crystal X-ray diffraction. The crystal structures show that, while the C(O)–N amide bond in DAB-Im exhibits a small twist, those in MCA-Im and TMB-Im are essentially planar. We found that, in these N-acyl imidazoles, the 17O quadrupole coupling and chemical shift tensors depend critically on the torsion angle between the conjugated acyl group and the C(O)–N amide plane. The computational results from a plane-wave DFT approach, which takes into consideration the entire crystal lattice, are in excellent agreement with the experimental solid-state 17O NMR results. Quantum chemical computations also show that the dependence of 17O NMR parameters on the Ar–C(O) bond rotation is very similar to that previously observed for the C(O)–N bond rotation in twisted amides. We conclude that one should be cautious in linking the observed NMR chemical shifts only to the twist of the C(O)–N amide bond.
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Affiliation(s)
- Xianqi Kong
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Aaron Tang
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Ruiyao Wang
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Eric Ye
- Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Victor Terskikh
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
- Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Gang Wu
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
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31
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Zarycz MNC, Provasi PF. Investigation of the resonance-assisted hydrogen bond in model β-diketones through localized molecular orbital analysis of the spin-spin coupling constants related to the O-H···O hydrogen bond. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2015; 53:120-129. [PMID: 25266873 DOI: 10.1002/mrc.4152] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 08/13/2014] [Accepted: 08/29/2014] [Indexed: 06/03/2023]
Abstract
The resonance-assisted hydrogen bond (HB) phenomenon has been studied theoretically by a localized molecular orbital (LMO) decomposition of the spin-spin coupling constants between atoms either involved or close to the O-H···O system of some β-diketones and their saturated counterparts. The analysis, carried out at the level of the second-order polarization propagator approximation, shows that the contributions in terms of LMO to the paramagnetic spin orbital and the spin dipolar Ramsey terms proof the importance of the delocalized π-electron structure supporting the idea of the existence of the resonance-assisted HB phenomenon phenomenon. The LMO contributions to the Fermi contact term indicate mainly the presence of the HB that may or not be linked to the π-electrons.
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Affiliation(s)
- M Natalia C Zarycz
- Department of Physics, University of Northeastern CONICET, Av. Libertad 5500, Corrientes, Argentina
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32
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Michaelis VK, Corzilius B, Smith AA, Griffin RG. Dynamic nuclear polarization of 17O: direct polarization. J Phys Chem B 2013; 117:14894-906. [PMID: 24195759 PMCID: PMC3922122 DOI: 10.1021/jp408440z] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Dynamic nuclear polarization of (17)O was studied using four different polarizing agents: the biradical TOTAPOL and the monoradicals trityl and SA-BDPA, as well as a mixture of the latter two. Field profiles, DNP mechanisms, and enhancements were measured to better understand and optimize directly polarizing this low-gamma quadrupolar nucleus using both mono- and biradical polarizing agents. Enhancements were recorded at <88 K and were >100 using the trityl (OX063) radical and <10 with the other polarizing agents. The >10,000-fold savings in acquisition time enabled a series of biologically relevant small molecules to be studied with small sample sizes and the measurement of various quadrupolar parameters. The results are discussed with comparison to room temperature studies and GIPAW quantum chemical calculations. These experimental results illustrate the strength of high field DNP and the importance of radical selection for studying low-gamma nuclei.
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Affiliation(s)
- Vladimir K. Michaelis
- Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA
| | | | | | - Robert G. Griffin
- Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA
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33
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Kong X, Shan M, Terskikh V, Hung I, Gan Z, Wu G. Solid-State 17O NMR of Pharmaceutical Compounds: Salicylic Acid and Aspirin. J Phys Chem B 2013; 117:9643-54. [DOI: 10.1021/jp405233f] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xianqi Kong
- Department
of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, K7L 3N6, Canada
| | - Melissa Shan
- Department
of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, K7L 3N6, Canada
| | - Victor Terskikh
- Department
of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, K7L 3N6, Canada
- National Research Council Canada, 100 Sussex Drive, Ottawa, Ontario, K1A
0R6, Canada
| | - Ivan Hung
- Center of Interdisciplinary
Magnetic
Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United
States
| | - Zhehong Gan
- Center of Interdisciplinary
Magnetic
Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United
States
| | - Gang Wu
- Department
of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, K7L 3N6, Canada
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34
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Bonhomme C, Gervais C, Babonneau F, Coelho C, Pourpoint F, Azaïs T, Ashbrook SE, Griffin JM, Yates JR, Mauri F, Pickard CJ. First-principles calculation of NMR parameters using the gauge including projector augmented wave method: a chemist's point of view. Chem Rev 2012; 112:5733-79. [PMID: 23113537 DOI: 10.1021/cr300108a] [Citation(s) in RCA: 312] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris, Université Pierre et Marie Curie, CNRS UMR, Collège de France, France.
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35
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Wu G, Zhu J. NMR studies of alkali metal ions in organic and biological solids. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2012; 61:1-70. [PMID: 22340207 DOI: 10.1016/j.pnmrs.2011.06.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2010] [Accepted: 05/31/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada.
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36
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DFT study of 17O, 1H and 13C NMR chemical shifts in two forms of native cellulose, I and I. Carbohydr Res 2012; 347:99-106. [DOI: 10.1016/j.carres.2011.10.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 10/19/2011] [Accepted: 10/26/2011] [Indexed: 11/19/2022]
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37
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Esrafili MD. Intra- and inter-molecular interactions in salicylic acid — Theoretical calculations of 17O and 1H chemical shielding tensors and QTAIM analysis. CAN J CHEM 2011. [DOI: 10.1139/v11-105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A density functional theory (DFT) study was performed to examine intra- and inter-molecular hydrogen bond (HB) properties in crystalline salicylic acid (SA). BLYP, B3LYP, and M06 functionals with 6–311++G** basis set were employed to calculate NMR chemical shielding isotropy (σiso) and anisotropy (Δσ) at the sites of the 17O and 1H nuclei of SA. From this study, it appears that the intra- and inter-molecular O–H···O as well as C–H···O HBs around the SA molecule in the crystal lattice have a major influence on the chemical shielding tensors and more specifically on the carbonyl 17O isotropy value. The quantum theory of atoms in molecules (QTAIM) analysis was also employed to elucidate the interaction characteristics in SA H-bonded network. Based on QTAIM results, a partial covalent character is attributed to the intra- and inter-molecular O–H···O HBs in SA.
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Affiliation(s)
- Mehdi D. Esrafili
- Laboratory of Theoretical Chemistry, Department of Chemistry, University of Maragheh, Maragheh, Iran
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38
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Fu W, Sun P. Solid state NMR study of hydrogen bonding, miscibility, and dynamics in multiphase polymer systems. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s11458-011-0254-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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39
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Esrafili MD, Alizadeh V. A theoretical investigation of hydrogen bonding effects on oxygen and hydrogen chemical shielding tensors of aspirin. Struct Chem 2011. [DOI: 10.1007/s11224-011-9810-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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40
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Shroyer MH, Day EP. Nuclear quadrupole double resonance spectrometer with magnetic property measurement system direct current superconducting quantum interference device detector and automatic tuning. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:055113. [PMID: 21639544 DOI: 10.1063/1.3587074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A new nuclear quadrupole double resonance spectrometer based on a commercial superconducting quantum interference device (SQUID) setup (a Magnetic Property Measurement System (MPMS) from Quantum Design) is described. The experiment involves the indirect detection of pure quadrupole resonances (PQR) of a dilute spin system via the direct SQUID detected NMR of an abundant spin system. The experiment is conducted at low (3-20 K) temperatures and the magnetic field is cycled between a high (5.5 T) polarizing field, to an intermediate (0.1 T) detection field, to zero field where the sample is irradiated with a modulated search RF and back to the detection field. Loss of the NMR signal indicates the detection of a PQR. The RF circuit used for both the NMR and zero field irradiation is digitally controlled. Use of the External Device Control allows for the complete automation of the system. Test measurements on diphenyl ether are in good agreement with previously reported results. Pure (17)O quadrupole resonances were detected for spin systems with concentrations as low as 120 μM.
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Affiliation(s)
- Mark H Shroyer
- Department of Physics, Knox College, Galesburg, Illinois 61401, USA.
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41
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Zhu J, Ye E, Terskikh V, Wu G. Solid-state (17)O NMR spectroscopy of large protein-ligand complexes. Angew Chem Int Ed Engl 2011; 49:8399-402. [PMID: 20672261 DOI: 10.1002/anie.201002041] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jianfeng Zhu
- Department of Chemistry, Queen's University, Kingston, ON K7L 3N6, Canada
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42
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Wong A, Howes AP, Yates JR, Watts A, Anupõld T, Past J, Samoson A, Dupree R, Smith ME. Ultra-high resolution 17O solid-state NMR spectroscopy of biomolecules: A comprehensive spectral analysis of monosodium L-glutamate·monohydrate. Phys Chem Chem Phys 2011; 13:12213-24. [DOI: 10.1039/c1cp20629j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Zhu J, Lau JYC, Wu G. A solid-state (17)O NMR study of L-tyrosine in different ionization states: implications for probing tyrosine side chains in proteins. J Phys Chem B 2010; 114:11681-8. [PMID: 20712305 DOI: 10.1021/jp1055123] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report experimental characterization of (17)O quadrupole coupling (QC) and chemical shift (CS) tensors for the phenolic oxygen in three l-tyrosine (l-Tyr) compounds: l-Tyr, l-Tyr.HCl, and Na(2)(l-Tyr). This is the first time that these fundamental (17)O NMR tensors are completely determined for phenolic oxygens in different ionization states. We find that, while the (17)O QC tensor changes very little upon phenol ionization, the (17)O CS tensor displays a remarkable sensitivity. In particular, the isotropic (17)O chemical shift increases by approximately 60 ppm upon phenol ionization, which is 6 times larger than the corresponding change in the isotropic (13)C chemical shift for the C(zeta) nucleus of the same phenol group. By examining the CS tensor orientation in the molecular frame of reference, we discover a "cross-over" effect between delta(11) and delta(22) components for both (17)O and (13)C CS tensors. We demonstrate that the knowledge of such "cross-over" effects is crucial for understanding the relationship between the observed CS tensor components and chemical bonding. Our results suggest that solid-state (17)O NMR can potentially be used to probe the ionization state of tyrosine side chains in proteins.
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Affiliation(s)
- Jianfeng Zhu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
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44
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Zhu J, Wu G. Quadrupole central transition 17O NMR spectroscopy of biological macromolecules in aqueous solution. J Am Chem Soc 2010; 133:920-32. [PMID: 21175170 DOI: 10.1021/ja1079207] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We demonstrate a general nuclear magnetic resonance (NMR) spectroscopic approach in obtaining high-resolution (17)O (spin-5/2) NMR spectra for biological macromolecules in aqueous solution. This approach, termed quadrupole central transition (QCT) NMR, is based on the multiexponential relaxation properties of half-integer quadrupolar nuclei in molecules undergoing slow isotropic tumbling motion. Under such a circumstance, Redfield's relaxation theory predicts that the central transition, m(I) = +1/2 ↔ -1/2, can exhibit relatively long transverse relaxation time constants, thus giving rise to relatively narrow spectral lines. Using three robust protein-ligand complexes of size ranging from 65 to 240 kDa, we have obtained (17)O QCT NMR spectra with unprecedented resolution, allowing the chemical environment around the targeted oxygen atoms to be directly probed for the first time. The new QCT approach increases the size limit of molecular systems previously attainable by solution (17)O NMR by nearly 3 orders of magnitude (1000-fold). We have also shown that, when both quadrupole and shielding anisotropy interactions are operative, (17)O QCT NMR spectra display an analogous transverse relaxation optimized spectroscopy type behavior in that the condition for optimal resolution depends on the applied magnetic field. We conclude that, with the currently available moderate and ultrahigh magnetic fields (14 T and higher), this (17)O QCT NMR approach is applicable to a wide variety of biological macromolecules. The new (17)O NMR parameters so obtained for biological molecules are complementary to those obtained from (1)H, (13)C, and (15)N NMR studies.
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Affiliation(s)
- Jianfeng Zhu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
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45
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Saitô H, Ando I, Ramamoorthy A. Chemical shift tensor - the heart of NMR: Insights into biological aspects of proteins. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2010; 57:181-228. [PMID: 20633363 PMCID: PMC2905606 DOI: 10.1016/j.pnmrs.2010.04.005] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 04/26/2010] [Indexed: 05/19/2023]
Affiliation(s)
- Hazime Saitô
- Department of Life Science, Himeji Institute of Technology, University of Hyogo, Kamigori, Hyog, 678-1297, Japan
| | - Isao Ando
- Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152-0033, Japan
| | - Ayyalusamy Ramamoorthy
- Biophysics and Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109-1055, USA
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46
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Zhu J, Ye E, Terskikh V, Wu G. Solid-State 17O NMR Spectroscopy of Large Protein-Ligand Complexes. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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47
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Wu G, Zhu J, Mo X, Wang R, Terskikh V. Solid-state (17)O NMR and computational studies of C-nitrosoarene compounds. J Am Chem Soc 2010; 132:5143-55. [PMID: 20307099 DOI: 10.1021/ja909656w] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We report the first solid-state (17)O NMR determination of the (17)O quadrupole coupling (QC) tensor and chemical shift (CS) tensor for four (17)O-labeled C-nitrosoarene compounds: p-[(17)O]nitroso-N,N-dimethylaniline ([(17)O]NODMA), SnCl(2)(CH(3))(2)([(17)O]NODMA)(2), ZnCl(2)([(17)O]NODMA)(2), and [(17)O]NODMA.HCl. The (17)O quadrupole coupling constants (C(Q)) observed in these C-nitrosoarene compounds are on the order of 10-15 MHz, among the largest values found to date for organic compounds. The (17)O CS tensor in these compounds exhibits remarkable sensitivity toward the nitroso bonding scheme with the chemical shift anisotropy (delta(11) - delta(33)) ranging from just 350 ppm in [(17)O]NODMA.HCl to over 2800 ppm in [(17)O]NODMA. This latter value is among the largest (17)O chemical shift anisotropies reported in the literature. These extremely anisotropic (17)O NMR interactions make C-nitrosoarene compounds excellent test cases that allow us to assess the detection limit of solid-state (17)O NMR. Our results suggest that, at 21.14 T, solid-state (17)O NMR should be applicable to all oxygen-containing organic functional groups. We also show that density functional theory (DFT) calculations can reproduce reasonably well the experimental (17)O QC and CS tensors for these challenging molecules. By combining quantum chemical calculations with experimental solid-state (17)O NMR results, we are able to determine the (17)O QC and CS tensor orientations in the molecular frame of reference for C-nitrosoarenes. We present a detailed analysis illustrating how magnetic field-induced mixing between individual molecular orbitals (MOs) contributes to the (17)O shielding tensor in C-nitrosoarene compounds. We also perform a Townes-Dailey analysis for the observed (17)O QC tensors and show that (17)O CS and QC tensors are intrinsically related through the pi bond order of the N horizontal lineO bond. Furthermore, we are able for the first time to examine the parallelism between individual (17)O and (15)N CS tensor components in C-nitrosoarenes.
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Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6.
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48
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Paudel A, Van Humbeeck J, Van den Mooter G. Theoretical and Experimental Investigation on the Solid Solubility and Miscibility of Naproxen in Poly(vinylpyrrolidone). Mol Pharm 2010; 7:1133-48. [DOI: 10.1021/mp100013p] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amrit Paudel
- Laboratory of Pharmacotechnology and Biopharmacy, and Department of Metallurgy and Materials Engineering, K.U.Leuven, Leuven, Belgium,
| | - Jan Van Humbeeck
- Laboratory of Pharmacotechnology and Biopharmacy, and Department of Metallurgy and Materials Engineering, K.U.Leuven, Leuven, Belgium,
| | - Guy Van den Mooter
- Laboratory of Pharmacotechnology and Biopharmacy, and Department of Metallurgy and Materials Engineering, K.U.Leuven, Leuven, Belgium,
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49
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Ronconi L, Sadler PJ. Applications of heteronuclear NMR spectroscopy in biological and medicinal inorganic chemistry. Coord Chem Rev 2008; 252:2239-2277. [PMID: 32226090 PMCID: PMC7094630 DOI: 10.1016/j.ccr.2008.01.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Accepted: 01/15/2008] [Indexed: 11/30/2022]
Abstract
There is a wide range of potential applications of inorganic compounds, and metal coordination complexes in particular, in medicine but progress is hampered by a lack of methods to study their speciation. The biological activity of metal complexes is determined by the metal itself, its oxidation state, the types and number of coordinated ligands and their strength of binding, the geometry of the complex, redox potential and ligand exchange rates. For organic drugs a variety of readily observed spin I = 1/2 nuclei can be used (1H, 13C, 15N, 19F, 31P), but only a few metals fall into this category. Most are quadrupolar nuclei giving rise to broad lines with low detection sensitivity (for biological systems). However we show that, in some cases, heteronuclear NMR studies can provide new insights into the biological and medicinal chemistry of a range of elements and these data will stimulate further advances in this area.
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Key Words
- ADP, adenosine diphosphate
- AES, atomic emission spectroscopy
- AMP, adenosine monophosphate
- ATP, adenosine triphosphate
- BNCT, boron neutron capture therapy
- BPG, 2,3-bisphosphoglycerate
- BSA, bovine serum albumin
- BSH, sodium borocaptate
- Bioinorganic chemistry
- Biological systems
- DNA, deoxyribonucleic acid
- EDTA-N4, ethylenediaminetetraacetamide
- EFG, electric field gradient
- GMP, guanosine monophosphate
- HMQC, heteronuclear multiple quantum correlation
- Heteronuclear NMR spectroscopy
- Im, imidazole
- In, indazole
- MQF, multiple quantum filtered
- MRI, magnetic resonance imaging
- Medicinal inorganic chemistry
- Metallopharmaceuticals
- NOE, nuclear Overhauser effect
- PET, positron emission tomography
- Quadrupolar nuclei
- RBC, red blood cell
- RNA, ribonucleic acid
- SDS, sodium dodecyl sulfate
- rRNA, ribosomal ribonucleic acid
- tRNA, transfer ribonucleic acid
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Affiliation(s)
- Luca Ronconi
- School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, UK
| | - Peter J Sadler
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
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50
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Rao Y, Kemp TF, Trudeau M, Smith ME, Antonelli DM. 17O and 15N Solid State NMR Studies on Ligand-Assisted Templating and Oxygen Coordination in the Walls of Mesoporous Nb, Ta and Ti Oxides. J Am Chem Soc 2008; 130:15726-31. [DOI: 10.1021/ja8056387] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuxiang Rao
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada, Department of Physics, University of Warwick, Coventry, U.K., CV4 7AL, and Emerging Technologies, Hydro-Québec Research Institute, 1800 Boulevard Lionel-Boulet, Varennes, Quebec, Canada J3X 1S1
| | - Tom F. Kemp
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada, Department of Physics, University of Warwick, Coventry, U.K., CV4 7AL, and Emerging Technologies, Hydro-Québec Research Institute, 1800 Boulevard Lionel-Boulet, Varennes, Quebec, Canada J3X 1S1
| | - Michel Trudeau
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada, Department of Physics, University of Warwick, Coventry, U.K., CV4 7AL, and Emerging Technologies, Hydro-Québec Research Institute, 1800 Boulevard Lionel-Boulet, Varennes, Quebec, Canada J3X 1S1
| | - Mark E. Smith
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada, Department of Physics, University of Warwick, Coventry, U.K., CV4 7AL, and Emerging Technologies, Hydro-Québec Research Institute, 1800 Boulevard Lionel-Boulet, Varennes, Quebec, Canada J3X 1S1
| | - Dave M. Antonelli
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada, Department of Physics, University of Warwick, Coventry, U.K., CV4 7AL, and Emerging Technologies, Hydro-Québec Research Institute, 1800 Boulevard Lionel-Boulet, Varennes, Quebec, Canada J3X 1S1
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