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  Subjects -> PHYSICS (Total: 793 journals)
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PHYSICS (572 journals)                  1 2 3 4 5 6 | Last

Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 8)
Acta Mechanica     Hybrid Journal   (Followers: 17)
Advanced Composite Materials     Hybrid Journal   (Followers: 51)
Advanced Functional Materials     Hybrid Journal   (Followers: 47)
Advanced Materials     Hybrid Journal   (Followers: 200)
Advanced Science Focus     Free   (Followers: 3)
Advanced Structural and Chemical Imaging     Open Access  
Advances in Condensed Matter Physics     Open Access   (Followers: 6)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 4)
Advances in Geophysics     Full-text available via subscription   (Followers: 6)
Advances in High Energy Physics     Open Access   (Followers: 16)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 3)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 15)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 17)
Advances in OptoElectronics     Open Access   (Followers: 4)
Advances In Physics     Hybrid Journal   (Followers: 9)
Advances in Physics Theories and Applications     Open Access   (Followers: 8)
Advances in Remote Sensing     Open Access   (Followers: 11)
AIP Advances     Open Access   (Followers: 8)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 33)
American Journal of Condensed Matter Physics     Open Access   (Followers: 4)
American Journal of Signal Processing     Open Access   (Followers: 10)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 2)
Annalen der Physik     Hybrid Journal   (Followers: 4)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 3)
Annales Henri PoincarĂ©     Hybrid Journal   (Followers: 2)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4)
Annals of Physics     Hybrid Journal   (Followers: 5)
Annals of West University of Timisoara - Physics     Open Access  
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 1)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (Followers: 1)
Annual Review of Materials Research     Full-text available via subscription   (Followers: 5)
APL Materials     Open Access   (Followers: 8)
Applied Composite Materials     Hybrid Journal   (Followers: 38)
Applied Physics A     Hybrid Journal   (Followers: 9)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 29)
Applied Physics Research     Open Access   (Followers: 4)
Applied Physics Reviews     Hybrid Journal   (Followers: 10)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 6)
Applied Remote Sensing Journal     Open Access   (Followers: 12)
Applied Spectroscopy     Full-text available via subscription   (Followers: 16)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 3)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 3)
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access  
Astronomy & Geophysics     Hybrid Journal   (Followers: 4)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 2)
Astrophysical Journal Letters     Full-text available via subscription   (Followers: 4)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 4)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 11)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 1)
Biomaterials     Hybrid Journal   (Followers: 35)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 18)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 16)
Biophysical Reviews     Hybrid Journal  
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 6)
Boson Journal of Modern Physics     Open Access  
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Bulletin of Materials Science     Open Access   (Followers: 41)
Bulletin of the Atomic Scientists     Full-text available via subscription   (Followers: 3)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de FĂ­sica     Open Access  
Canadian Journal of Physics     Full-text available via subscription   (Followers: 1)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 2)
Cells     Open Access   (Followers: 1)
CERN courier. International journal of high energy physics     Free   (Followers: 4)
Chemical Physics of Solid Surfaces     Full-text available via subscription  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 1)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 2)
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cogent Physics     Open Access  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Computational Physics     Full-text available via subscription   (Followers: 1)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 3)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 1)
Complex Analysis and its Synergies     Open Access  
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 123)
Composites Part B : Engineering     Hybrid Journal   (Followers: 143)
Computational Astrophysics and Cosmology     Open Access  
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 22)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 1)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription  
Computer Physics Communications     Hybrid Journal   (Followers: 1)

        1 2 3 4 5 6 | Last

Journal Cover Annual Reports on NMR Spectroscopy
  [SJR: 0.616]   [H-I: 28]   [1 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 0066-4103
   Published by Elsevier Homepage  [2801 journals]
  • Index
    • Abstract: Publication date: 2016
      Source:Annual Reports on NMR Spectroscopy, Volume 87




      PubDate: 2016-01-18T02:18:20Z
       
  • Index
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 86




      PubDate: 2016-01-18T02:18:20Z
       
  • Index
    • Abstract: Publication date: 2014
      Source:Annual Reports on NMR Spectroscopy, Volume 83




      PubDate: 2016-01-18T02:18:20Z
       
  • Recent NMR Studies of Ionic Liquids
    • Abstract: Publication date: Available online 14 January 2016
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Krishnan Damodaran
      This review presents recent developments in the application of nuclear magnetic resonance (NMR) spectroscopy to study ionic liquids. In addition to routine structural characterization of synthesized ionic liquids, availability of multitude of advanced NMR techniques enables researchers to probe the structure and dynamics of these materials. Also most of the ionic liquids contain a host of NMR-active nuclei that are perfectly suitable for multinuclear NMR experiments. This review focuses on the application of NMR techniques, such as pulsed field gradient, relaxometry, nuclear Overhauser effect, electrophoretic NMR, and other novel experiments designed to investigate pure ionic liquids and the interaction of ionic liquids with various salts and solutes.


      PubDate: 2016-01-18T02:18:20Z
       
  • Preface
    • Abstract: Publication date: 2016
      Source:Annual Reports on NMR Spectroscopy, Volume 87
      Author(s): Graham A. Webb



      PubDate: 2016-01-14T01:23:01Z
       
  • Contributors
    • Abstract: Publication date: 2016
      Source:Annual Reports on NMR Spectroscopy, Volume 87




      PubDate: 2016-01-14T01:23:01Z
       
  • Copyright
    • Abstract: Publication date: 2016
      Source:Annual Reports on NMR Spectroscopy, Volume 87




      PubDate: 2016-01-14T01:23:01Z
       
  • Advances in 27Al MAS NMR Studies of Geopolymers
    • Abstract: Publication date: Available online 6 January 2016
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Jiri Brus, Sabina Abbrent, Libor Kobera, Martina Urbanova, Pavel Cuba
      Geopolymers have received considerable attention for their low cost, excellent mechanical and physical properties, low energy consumption, and reduced greenhouse emissions during manufacture. A typical application of geopolymers is their replacement of Portland cement as a building material. However, geopolymers have even greater application potential as regenerable catalysts, membranes, and storage materials for toxic chemicals, as well as photoactive composites. The structural characterization of these aluminosilicates, however, continues to be a challenge. Section 1 of the presented work provides a brief history, the typical applications, and conventional as well as advanced routes of synthesis of geopolymers, while discussing the issue of current problems with their structure elucidation. In Section 2, the basic principles of 27Al magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy as a tool for the structural characterization of geopolymers are introduced, while Section 3 summarizes advanced multidimensional and multinuclear techniques of 27Al MAS NMR spectroscopy. Sections 4 and 5 feature recent applications and show future methodological prospects for possible 27Al solid-state NMR approaches to geopolymers.


      PubDate: 2016-01-09T00:03:12Z
       
  • Applications of NMR Techniques in the Development and Operation of Proton
           Exchange Membrane Fuel Cells
    • Abstract: Publication date: Available online 4 January 2016
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Liuming Yan, Yidong Hu, Xiaoming Zhang, Baohua Yue
      The application of nuclear magnetic resonance (NMR) techniques, including solution-state NMR, solid-state magic angle spinning NMR, pulsed field gradient NMR, relaxometry, and magnetic resonance imaging in the development of proton exchange membrane fuel cells and direct methanol fuel cells, especially the proton-conducting materials and electrocatalysts, is reviewed.


      PubDate: 2016-01-04T22:31:48Z
       
  • Reviewing 47/49Ti Solid-State NMR Spectroscopy: From Alloys and Simple
           Compounds to Catalysts and Porous Materials
    • Abstract: Publication date: Available online 28 November 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Bryan E.G. Lucier, Yining Huang
      Titanium is a strong, low-density element with a diverse variety of applications in fields such as the aerospace and automotive industries, biomedical implants, electronics, solar cells, polymerization catalysts, and photocatalysts. In many instances, the local environment of Ti has a substantial influence on the physical and electronic properties of these materials. Solid-state NMR (SSNMR) is an increasingly popular non-destructive avenue for obtaining rich, detailed information regarding titanium and its surroundings. The two NMR-active isotopes of titanium, 47Ti and 49Ti, have very similar properties, which often leads to overlapping resonances and complicated SSNMR spectra. Despite these challenges, many researchers have successfully utilized 47/49Ti SSNMR experiments to gain a unique molecular-level understanding of the local electronic, magnetic, and structural environment about titanium. Ti NMR parameters are strongly correlated to distinct structural features (e.g., TiO6 octahedral distortion). This review takes the reader on a comprehensive tour of 47/49Ti SSNMR spectroscopy spanning ca. 60 publications, from the first report in 1963 to the current state of the art in 2015. We begin with an introduction to the element of titanium, its properties, isotopes, and impressive range of applications. An introduction to the relevant NMR interactions and their parameters is then provided, followed by a discussion of various pulse sequences and strategies for 47/49Ti SSNMR signal enhancement, and a breakdown of the various compounds that have been used for 47/49Ti chemical shift referencing. The main literature review is grouped according to the nature of Ti materials: Ti metal, TiH2/TiD2 and their stoichiometric derivatives, BaTiO3 and SrTiO3, the three polymorphs of TiO2 (rutile, anatase, and brookite), ATiO3-type compounds (A=metal, e.g., perovskite and ilmenite), intermetallic and binary Ti compounds, porous and layered materials, and practical applications of 47/49Ti SSNMR spectroscopy in recent times. Considering the tremendous advances in the field within the last two decades, 47/49Ti SSNMR spectroscopy shows great promise for routine, detailed characterization of Ti alloys, compounds, and nanomaterials both today and in the future.


      PubDate: 2015-11-29T01:15:51Z
       
  • Interactions Between Electrolytes and Carbon-Based Materials—NMR
           Studies on Electrical Double-Layer Capacitors, Lithium-Ion Batteries, and
           Fuel Cells
    • Abstract: Publication date: Available online 14 October 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Martin Oschatz, Lars Borchardt, Felix Hippauf, Winfried Nickel, Stefan Kaskel, Eike Brunner
      Electrical double-layer capacitors, lithium-ion batteries, and fuel cells are among the most important devices for storage and conversion of electrochemical energy. Further improvement of these systems and their single components is needed to meet the future requirements in terms of higher energy and power densities. In all of these devices, the interactions between carbonaceous materials and electrolyte components play crucial roles. In electrical double-layer capacitors and lithium-ion batteries, electrolyte ions get in direct contact with carbon electrode materials for energy storage. In fuel cells, carbon-supported electrode catalysts and polymeric membranes are among the most important components. For a directed improvement of these devices, a profound understanding of the processes taking place on the carbon–electrolyte interfaces is crucial. Especially nuclear magnetic resonance spectroscopy is qualified for the characterization of these interactions due to its chemical specificity, the local nature of NMR-relevant interactions, the possibility to investigate both amorphous and crystalline compounds, and the potential to monitor dynamic processes that occur over a wide timescale. This review addresses recent NMR spectroscopic investigations of the interactions between electrolytes and carbon materials in electrical double-layer capacitors, lithium-ion batteries, and fuel cells. Structures and properties of the most important carbon nanomaterials relevant for these devices are discussed, and the general principles of the electrochemical energy storage systems are introduced. Fundamental principles as well as hardware aspects of in situ and ex situ NMR measurements are addressed. The relationships between the properties of the carbon materials, the electrochemical characteristics, and the NMR data are explained. NMR spectroscopy as the profound analytical method is considered in combination with the operating principles of the electrochemical energy storage devices.


      PubDate: 2015-10-19T07:53:26Z
       
  • Multiple-Quantum NMR Studies on Molecular Mixtures
    • Abstract: Publication date: Available online 1 October 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Stefano Caldarelli, Mehdi Yemloul
      Multiple-quantum NMR (MQ-NMR), while being one of the first bidimensional techniques ever experienced, has only recently been adapted to the characterization of complex mixtures of small molecules. This review summarizes recent research that explored this avenue, capitalizing on specific properties of higher order coherences, alone or in conjunction with diffusometry. Finally, we discuss integration of MQ-NMR spectroscopy with modern methods for accelerating the acquisition of multidimensional techniques, showing that, if concentration is appropriate, these experiments can be run in a few seconds.


      PubDate: 2015-10-03T13:19:39Z
       
  • Recent Advances in 14N Solid-State NMR
    • Abstract: Publication date: Available online 16 September 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Eddy Dib, Tzonka Mineva, Bruno Alonso
      This chapter is devoted to the recent advances in 14N solid-state NMR related to both theoretical and practical aspects. First, the last NMR methods developed to facilitate the direct or indirect detection of 14N signals are presented in a succinct and comprehensive way. Further, the theoretical approaches that have been applied to model the 14N NMR quadrupolar parameters are explained and discussed regarding their ability to yield pertinent information on structures and dynamics of nitrogen containing solids. Last, most of the results obtained by 14N NMR characterization on inorganic, hybrid organic–inorganic, organic, or biological materials are presented, and the related NMR parameters are compiled in tables.


      PubDate: 2015-09-16T17:50:09Z
       
  • 31P MRSI Studies in Patients with Cancer
    • Abstract: Publication date: Available online 8 September 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Vitaliy Khlebnikov, Jannie Wijnen, Wybe J.M. van der Kemp, Dennis W.J. Klomp
      Many years of research and development culminated in the establishment of phosphorous-31 (31P) magnetic resonance spectroscopy (MRS) as a powerful tool in the characterization of cancer microenvironment. 31P MRS provides vital information on cancer bioenergetics, phospholipid biosynthesis, and pH, which latter is linked to tumor vasculature and oxygen consumption. Changes in cancer microenvironment during tumor progression or in response to therapy will result in changes in these biomarkers, which manifest itself as alterations in the localized 31P MR spectrum. Moreover, as the 31P MR spectra represent metabolism rather than morphology, changes in tumor microenvironment can be observed at an early stage. Thus, 31P MRS localized or imaged (MRSI) to the tumor is a powerful tool in the assessment of tumor therapy response. The combination of magnetic resonance imaging (MRI) with 31P MRSI is expected to improve cancer treatment by personalizing therapy and minimizing adverse effects, enabling better patient care. Here, we review state-of-the-art 31P MRSI as a noninvasive tool to assess unique relevant biomarkers from cancer in patients in vivo.


      PubDate: 2015-09-13T14:26:33Z
       
  • Copyright
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 86




      PubDate: 2015-08-22T15:09:27Z
       
  • Contributors
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 86




      PubDate: 2015-08-22T15:09:27Z
       
  • Preface
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 86
      Author(s): Graham A. Webb



      PubDate: 2015-08-22T15:09:27Z
       
  • Recent Solid-State NMR Studies of Membrane-Bound Peptides and Proteins
    • Abstract: Publication date: Available online 23 July 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Akira Naito, Izuru Kawamura, Namsrai Javkhlantugs
      Solid-state nuclear magnetic resonance (NMR) spectroscopy provides useful information on the structure, topology, and orientation of peptides and proteins bound to lipid bilayers. The structure and orientation of membrane-associated peptides and proteins can be elucidated by analyzing structural constraints obtained from anisotropic chemical-shift interactions such as chemical-shift oscillation or nuclear dipole interactions (e.g., dipolar waves) or a combination of thereof (e.g., polarity index slant angle [PISA] wheel patterns). Detailed structural determinations of various peptides and proteins in the membrane-bound state are presented. Magic-angle spinning (MAS) experiments considered with cross-polarization (CP) and high-power decoupling (CP-MAS) provide high-resolution 13C- and 15N-NMR signals for selectively or uniformly labeled membrane-bound peptides and proteins. In solid-state NMR, homonuclear and heteronuclear dipolar interactions are recoupled using various spin manipulation pulse sequences under MAS conditions. These experiments enable the correlation of 13C–13C and 15N–13C signals for assignment to amino acid residues. These resulting data make it possible to determine the high-resolution structures of membrane-bound peptides and proteins. Molecular dynamics (MD) simulation is a useful tool for investigating the dynamic structures of biological molecules in membrane environments. Applications of MD simulation to membrane-bound peptides and proteins are also reviewed.


      PubDate: 2015-07-24T11:41:50Z
       
  • Recent NMR Studies of Thermotropic Liquid Crystals
    • Abstract: Publication date: Available online 21 July 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Ronald Y. Dong
      Solid state NMR pulse techniques have been found most useful to elucidate order and dynamics of molecules of various shapes which can self-assemble into ordered fluids. This chapter aims to highlight some recent advances in the field of liquid crystals, mainly of thermotropic varieties, over the past decade. The rapid rise in the number of new liquid-crystal types and the associated mesomorphic phases have made a complete coverage almost impossible, even just keeping to the vast number of NMR studies. The nuclei covered here are limited to 1H, 2H, 13C, and 19F that are commonly employed to do spectroscopy and/or to measure spin relaxation in order to reveal the dynamics of liquid-crystal molecules. Orientational order parameters of rod-like and board-like molecules are described in uniaxial and biaxial mesophases. Particular attention is focused on newly discovered nematic phases of achiral V-shaped and dimeric mesogens and the nature of phase transition(s) between phases of different symmetries. Effects of an applied magnetic field on the helical structures of ferroelectric liquid crystals are highlighted. Jump diffusions of molecules in mesophases that occur in the intermediate motion regime on the NMR timescale are given first, followed by a discussion of faster molecular motions studied by deuterium and proton spin relaxation. Various spin relaxation mechanisms arising from differenct molecular processes in liquid crystals are also outlined. A survey of proton NMR studies of rigid and flexible solutes dissolved mainly in nematic/smectic A solvents is given to illustrate how information on the intermolecular orienting potential can be obtained from their orientational/positional ordering. The chapter ends with a brief look at recent studies of order in liquid-crystal confined systems.


      PubDate: 2015-07-21T11:31:58Z
       
  • 27Al NMR Studies of Aluminosilicate Glasses
    • Abstract: Publication date: Available online 14 July 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Mattias Edén
      Aluminosilicate glasses are of great geological and technological importance. Significant efforts have been spent for enhancing the insight into their structures, where magic-angle-spinning (MAS) NMR that exploits the spin-5/2 27Al as probe nucleus constitutes one widely utilized option. We review the application of basic 27Al NMR experimentation for studying primarily the short-range ( ≲ 0.3 nm) structure of aluminosilicate glasses, emphasizing practical aspects of performing MAS and triple-quantum MAS NMR experiments, as well as options for data analysis to extract 27Al NMR parameters and quantifying AlO p populations. We illustrate the strengths and weaknesses of routine 27Al NMR for investigating aluminosilicate glasses, including its development over time. While parts of the text apply generally to MAS NMR targeting half-integer spins as structural probes in crystalline as well as amorphous materials, the focus remains on 27Al NMR applications to aluminosilicate glasses, whose basic structural features are outlined together with a survey of the most central research problems in the field. By providing both in-depth discussions about the building blocks of aluminosilicate glasses while assuming a modest background knowledge of the reader about MAS NMR and glass structure, we hope that the presentation will appeal to a broad audience, encompassing both experienced researchers in solid-state NMR or glass structures, as well as to beginners in either area.


      PubDate: 2015-07-17T11:19:31Z
       
  • Subject Index
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 85




      PubDate: 2015-06-20T00:23:11Z
       
  • Copyright
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 85




      PubDate: 2015-06-20T00:23:11Z
       
  • Contributors
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 85




      PubDate: 2015-06-20T00:23:11Z
       
  • Preface
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 85
      Author(s): Graham A. Webb



      PubDate: 2015-06-20T00:23:11Z
       
  • Solvent Effects on Nitrogen Chemical Shifts
    • Abstract: Publication date: Available online 30 May 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Hanna Andersson , Anna-Carin C. Carlsson , Bijan Nekoueishahraki , Ulrika Brath , Máté Erdélyi
      Due to significant developments in cryogenic probe technology and the easy access to inverse detection pulse programmes (HSQC, HMBC), the sensitivity of nitrogen NMR has lately vastly improved. As a consequence, nitrogen NMR has turned into a useful and commonly available tool for solution studies of molecular structure and properties for small organic compounds likewise biopolymers. The high sensitivity of the nitrogen lone pair to changes in the molecular environment, alterations in intra- and intermolecular interactions, and in molecular conformation along with its wide, up to 1200ppm chemical shift dispersion make nitrogen NMR to an exceptionally sensitive reporter tool. The nitrogen chemical shift has been applied in various fields of chemistry, including for instance the studies of transition metal complexes, chemical reactions such as N-alkylation and N-oxidation, tautomerization, protonation–deprotonation equilibria, hydrogen and halogen bonding, and elucidation of molecular conformation and configuration. The 15N NMR data observed in the investigation of these molecular properties and processes is influenced by the medium it is acquired in. This influence may be due to direct coordination of solvent molecules to transition metal complexes, alteration of tautomerization equilibria, and solvent polarity induced electron density changes of conjugated systems, for example. Thus, the solvent may significantly alter the observed nitrogen NMR shifts. This review aims to provide an overview of solvent effects of practical importance, and discusses selected experimental reports from various subfields of chemistry.


      PubDate: 2015-06-04T13:05:08Z
       
  • NMR Relaxation Studies of Elastomers
    • Abstract: Publication date: Available online 23 May 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Atsushi Asano
      I reviewed the recent studies of rubbery materials, especially which deal with relaxation phenomena. The NMR relaxations for rubbers have been widely investigated before developing the high-resolution solid-state NMR technique in early 1980s. Before starting review of the recent works, I touched upon the utilized formulae for NMR relaxation very simply because some admirable reviews about NMR relaxation have already been recently published. In the past 15 years, supreme pulse techniques and analysis methods were developed and applied to elastomers and rubbers to elucidate the network structure and the polymer chain dynamics. I focused on such research works in this review, namely NMR relaxation feature under strain, degradation and aging process, cross-link density, interaction with fillers and its interface structure, network structure and defects, polymer chain dynamics, and so on. Finally, I concisely summarized the applications of the inverse Laplace transform, which facilitates visual analysis and recognition, to reveal dynamics and cross-link density of elastomers and rubbers.


      PubDate: 2015-05-24T04:25:57Z
       
  • 14N Overtone Magic Angle Spinning NMR
    • Abstract: Publication date: Available online 16 May 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Luke A. O’Dell
      Overtone NMR spectroscopy has the potential to provide high-resolution 14N solid-state NMR spectra. The technique was first developed during the 1980s but has only recently been successfully combined with magic angle spinning (MAS), providing improved sensitivity and resolution as well as enabling more advanced approaches such as indirect detection and signal enhancement methods. This report provides a brief background to 14N overtone NMR, describing the ways in which it differs from conventional NMR and the challenges that arise as a result. The effects of MAS on the overtone spectrum are then presented and illustrated with numerous experimental and simulated examples. Finally, several recent developments enabled by MAS are described and some potential future directions are suggested.


      PubDate: 2015-05-19T23:05:13Z
       
  • Recent Advances in NMR Studies of Lipids
    • Abstract: Publication date: Available online 23 April 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Slawomir Pikula , Joanna Bandorowicz-Pikula , Patrick Groves
      Discoveries made over the last 20 years have shown that NMR has evolved from determining lipid structures to revealing how lipids are involved in vital cellular processes, including vesicular transport and cellular signalling. Revealing the structures of lipids, their partner proteins and interacting molecules, as well as their composition in organelles, cells and tissues are essential for understanding the roles of lipids within the cell. The lipid-dependent sorting of proteins in post-Golgi vesicular traffic is one of many examples. This, and other phenomena including cellular signalling pathways, relies on specific interactions (non-covalent) of membrane and cytoskeletal proteins with membrane lipids. This also takes into account the roles of certain lipids, such as cholesterol and sphingomyelin, in the formation, stabilization and sustenance of lipid membrane microdomains, such as rafts and caveolae. The growing number of experimental approaches include solid- and solution-state NMR, as well as in vivo NMR, to study lipid–protein, lipid–small solutes interactions and membrane-related processes. Further, we provide examples of applications based on NMR in biomedicine diagnosis and therapy, and in resolving lipid-related pathomechanisms, as well as methodological approaches.


      PubDate: 2015-04-26T08:06:55Z
       
  • Solid-State High-Resolution NMR Studies on PEO-Based Crystalline Solid
           Polymer Electrolytes for Lithium-Ion Battery
    • Abstract: Publication date: Available online 13 March 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Bo Peng , Yefeng Yao , Qun Chen , Bingwen Hu
      Poly(ethylene oxide)-based (PEO-based) crystalline solid polymer electrolytes (SPEs) have been extensively investigated in recent years. Within these works, studies on the conduction mechanism of crystalline SPEs are of particular importance, in order to further improve the performance of these SPEs. Recently, we demonstrated that through careful sample preparation, very high resolution of 13C and 7Li NMR spectra of these systems can be obtained at room temperature, which gives the possibility of studying the phase structures and molecular motions of these sample systems at deeper level. A series of works were carried out thereafter on PEO-based crystalline SPEs systems by employing solid-state high-resolution NMR and the obtained results are reviewed here.


      PubDate: 2015-03-17T12:15:51Z
       
  • 31P NMR Studies of Phospholipids
    • Abstract: Publication date: Available online 13 March 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Andrei V. Filippov , Aidar M. Khakimov , Bulat V. Munavirov
      31P nuclear magnetic resonance (NMR) can provide information on the composition of phospholipid (PL) membranes, lipid headgroup orientation relative to the bilayers normal, and the phase state of PL systems. Interaction of the membrane with ions, drugs, other small molecules and peptides may lead to lipid phase change and lamellar phase disturbances, which can also be revealed in 31P NMR spectra. Traditional 31P NMR spectroscopy has been used for years, mainly to study lipid phase state. In the last few years, however, its utility has been extended by a number of solid-state methods in field-cycling spectroscopy. Membrane mimicking systems have been complemented with bicelles, which are more convenient for studying peptide structure in lipid–peptide interactions. Another challenge is the study of ordered membrane domains (rafts) induced in the presence of cholesterol or certain proteins. As a result, recent work has refined the structure of PL headgroups and elucidated membrane responses to interactions with peptides and other molecules. Selected examples of such fascinating investigations are presented here.


      PubDate: 2015-03-17T12:15:51Z
       
  • Third Spin-Assisted Recoupling in SSNMR Theoretical Insights and
           Practicable Application to Biomolecular Structure Determination
    • Abstract: Publication date: Available online 13 March 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Subhradip Paul , Hiroki Takahashi , Sabine Hediger , Gaël De Paëpe
      In solid-state nuclear magnetic resonance (SSNMR) under magic-angle spinning (MAS), the dipolar interactions (that contains distance information), averaged out by sample spinning, can be reintroduced by the application of carefully designed radiofrequency pulses called dipolar recoupling sequences. In this review, we will essentially focus on a recently introduced recoupling mechanism namely third spin-assisted recoupling (TSAR) which allows exchanging magnetization between two spins (say A and B) without relying on the reintroduction of the AB dipolar coupling. Instead, it uses a second-order effect driven by a cross-term between two dipolar terms (AH and BH) where H stands for an assisting spin (typically a proton). After a theory section delineating the principles of TSAR and of its related sequences (PAR and PAIN-CP), we will discuss some practical aspects of its experimental implementation (at moderate and ultra-high spinning frequencies) and its ability to provide structurally relevant C–C, N–C, and N–N distance information. Finally, recent applications of TSAR for structure determination of biomolecules will be overviewed.


      PubDate: 2015-03-17T12:15:51Z
       
  • 17O NMR: A “Rare and Sensitive” Probe of Molecular
           Interactions and Dynamics
    • Abstract: Publication date: Available online 13 March 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Franca Castiglione , Andrea Mele , Guido Raos
      This review summarizes recent developments in the area of liquid-state nuclear magnetic resonance spectroscopy of the 17O nucleus. It is structured in sections, respectively, covering (a) general background information, with special emphasis on spin relaxation phenomena for quadrupolar nuclei and in paramagnetic environments, (b) methods for the calculation of 17O NMR parameters, with illustrative results, (c) applications in chemistry and materials science, (d) application to biomolecules and biological systems, and (e) relaxation phenomena, including contrast agents for magnetic resonance imaging. The 17O nucleus emerges as a very sensitive probe of the local environment—including both bonding and nonbonding interactions—and molecular motions.


      PubDate: 2015-03-17T12:15:51Z
       
  • Contributors
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 84




      PubDate: 2015-03-01T09:08:04Z
       
  • Preface
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 84
      Author(s): Graham A. Webb



      PubDate: 2015-03-01T09:08:04Z
       
  • Subject Index
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 84




      PubDate: 2015-03-01T09:08:04Z
       
  • Copyright
    • Abstract: Publication date: 2015
      Source:Annual Reports on NMR Spectroscopy, Volume 84




      PubDate: 2015-03-01T09:08:04Z
       
  • Applications of 1H–15N Long-Range Heteronuclear Shift Correlation
           and 15N NMR in Alkaloid Chemistry
    • Abstract: Publication date: Available online 13 February 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Gary E. Martin , Antony J. Williams
      Applications of long-range 1H–15N heteronuclear shift correlation data to alkaloid structure elucidation are reviewed for the period covering from 2007 to mid-2014. The review covers experiments and parametric considerations, including several new 1H–15N long-range heteronuclear shift correlation methods. Applications of computer-assisted structure elucidation or CASE programs are discussed, followed by applications of covariance-processing methods that can be used to calculate 13C–15N heteronuclear shift correlation spectra. Applications reported in the years prior to 2007 that have been overlooked in previous reviews are then discussed followed by a class-by-class systematic review of applications of 1H–15N long-range heteronuclear shift correlation methods that cover through mid-2014. Studies describing the revision of alkaloid structures that have appeared during the period complete the review.


      PubDate: 2015-02-14T06:22:26Z
       
  • A Review of 91Zr Solid-State Nuclear Magnetic Resonance Spectroscopy
    • Abstract: Publication date: Available online 13 January 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Bryan E.G. Lucier , Yining Huang
      Solid-state NMR (SSNMR) is a powerful probe of the molecular-level geometric, electronic, and magnetic environment about a target nucleus. Significant advances have been made in 91Zr SSNMR spectroscopy since its inception, particularly within the past 25 years. 91Zr is an unfavorable nucleus for SSNMR studies, owing to its small gyromagnetic ratio, low natural abundance, and moderate quadrupole moment. In the past, studies were limited to Zr nuclei residing in high-symmetry local environments, such as metals and Laves-phase materials. The availability of high magnetic fields and advanced pulse sequences, in addition to significant progress in complementary theoretical characterization techniques such as ab initio quantum chemical calculations, has rendered a plethora of Zr environments amenable to 91Zr SSNMR experiments. In this review, we first discuss the background and applications of zirconium, followed by a brief introduction of relevant SSNMR parameters. 91Zr SSNMR experimental techniques employed over the years, along with their benefits and drawbacks, are then discussed in detail. Historical accounts of zero-field and field-swept 91Zr SSNMR experiments from 1964 to 1990 are reviewed, followed by modern pulsed-Fourier transform 91Zr experiments from 1990 to 2000, and recent advances from 2000 to 2014. The wealth of information available from modern 91Zr SSNMR experiments holds great promise for future applications to a variety of Zr systems.


      PubDate: 2015-01-15T00:48:41Z
       
  • Recent Advances in Small Molecule NMR: Improved HSQC and HSQMBC
           Experiments
    • Abstract: Publication date: Available online 13 January 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Laura Castañar , Teodor Parella
      A general description of the latest developments in heteronuclear single-quantum correlation and heteronuclear single-quantum multiple bond correlation experiments designed for small molecules at the natural isotopic abundance is reported. A discussion is made on the details introduced into novel NMR pulse sequences with special emphasis on modern concepts such as fast NMR or pure shift NMR and also on robust techniques affording pure in-phase multiplet patterns, which are amenable for a simpler and a more accurate analysis. The suitability of some of these methods for the quantitative measurement of one-bond and long-range proton–carbon coupling values in molecules in isotropic and weakly aligned anisotropic conditions is also reviewed.


      PubDate: 2015-01-15T00:48:41Z
       
  • Solid-State Covariance NMR Spectroscopy
    • Abstract: Publication date: Available online 13 January 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Kazuyuki Takeda
      Covariance NMR spectroscopy allows acquisition of spin–spin correlation in a more efficient way compared to the traditional two-dimensional Fourier-transformation NMR spectroscopy, leading to reduction in the experimental time or increase in the sensitivity of the spectrum obtainable within a given experimental time. This chapter summarizes recent works on covariance NMR, focusing on its applications to solid-state NMR spectroscopy. In addition to a brief survey of the covariance spectroscopy, an open question of whether “inner-product” spectroscopy is more natural is posted. The usefulness of covariance NMR spectroscopy is presented by exploring its applications to solid-state systems of chemical/biological interest. A number of recent reports to further improve its efficiency or to extend the scope of its applicability are reviewed.


      PubDate: 2015-01-15T00:48:41Z
       
  • Recent Advances in Chlorine, Bromine, and Iodine Solid-State NMR
           Spectroscopy
    • Abstract: Publication date: Available online 13 January 2015
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Patrick M.J. Szell , David L. Bryce
      We survey the latest advances in quadrupolar halogen (35/37Cl, 79/81Br, and 127I) solid-state nuclear magnetic resonance (SSNMR). The reporting period is from August 2008 through to July 2014; prior work has been covered in a previous review from our group (Widdifield et al. [2]). The past 6 years have witnessed a continued growth in the areas of application of chlorine, bromine, and iodine SSNMR. Such areas include the study of halogen-bonded adducts, pharmaceutical polymorphs, inorganic compounds and materials, supported catalysts, ionic liquids, glasses, and more. Many of the new studies focus on the 35/37Cl nuclides due to their relatively favorable spectroscopic properties compared to the 79/81Br and 127I nuclides. The first systematic 35/37Cl SSNMR studies of covalently bonded chlorine in organic and inorganic compounds have been reported. Higher applied magnetic fields and ongoing technique development continue to open new avenues of opportunity for applications of chlorine, bromine, and iodine SSNMR.


      PubDate: 2015-01-15T00:48:41Z
       
 
 
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