Download or read book Determination of Structure in Heterogeneous Solids Using Heteronuclear Dipolar Coupling Solid state NMR written by Erin Elizabeth Wilson and published by . This book was released on 2005 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure Elucidation of Organic Solids Using Heteronuclear Dipolar Solid State NMR Spectroscopy written by Ingolf Sack and published by . This book was released on 1998 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solid State NMR in Zeolite Catalysis written by Jun Xu and published by Springer. This book was released on 2019-05-11 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-State NMR Characterization of Heterogeneous Catalysts and Catalytic Reactions provides a comprehensive account of state-of-the-art solid-state NMR techniques and the application of these techniques in heterogeneous catalysts and related catalytic reactions. It includes an introduction to the basic theory of solid-state NMR and various frequently used techniques. Special emphasis is placed on characterizing the framework and pore structure, active site, guest-host interaction, and synthesis mechanisms of heterogeneous catalysts using multinuclear one- and two-dimensional solid-sate NMR spectroscopy. Additionally, various in-situ solid-state NMR techniques and their applications in investigation of the mechanism of industrially important catalytic reactions are also discussed. Both the fundamentals and the latest research results are covered, making the book suitable as a reference guide for both experienced researchers in and newcomers to this field. Feng Deng is a Professor at Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences.

Download or read book Solid state NMR Techniques for Dipolar Coupling Measurements in Locally ordered Biological Solids written by Rebecca Ann Shapiro and published by . This book was released on 2011 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the low-viscosity samples used in solution-state nuclear magnetic resonance (NMR) spectroscopy, molecular tumbling occurs on a much faster timescale than a single NMR experiment. As a result, anisotropic interactions between the nuclei average to zero and sharp, narrow, isotropic lineshapes are easily obtained. However, in systems with local order, rotational and translation mobility of molecules is signifcantly reduced. In this solid-state regime, anisotropic interactions are no longer motionally averaged, and three additional effects are observed to severely complicate NMR spectra: heteronuclear and homonuclear dipolar couplings, and chemical shift anisotropy (CSA). Magic-angle spinning (MAS) is a solid-state NMR (ssNMR) technique that makes it possible to mechanically average these anisotropic effects to zero and acquire sharp, isotropic peaks analogous to those found in solution. However, the presence of dipolar couplings and CSA allows additional structural information about biomolecules to be extracted; so there is demand for ssNMR techniques that take advantage of anisotropic interactions. Switched angle spinning (SAS) is one such method that can be used for structural studies of oriented biological samples. SAS combines the advantage of the magic angle spinning with the structural information provided by heteronuclear and homonuclear dipolar couplings and CSA by correlating isotropic chemical shifts in one dimension with anisotropic information in a second dimension. Presented herein is current work on two related research efforts: the development and characterization of a new biologically-relevant alignment medium with increased thermal stability ideal for recovery of additional structural constraints from dipolar couplings and CSA in membrane proteins and peptides, and simulation work laying the foundation for new SAS experiments optimized for structural studies of membrane proteins, peptides, and other biomolecules with local order induced by bicelles or other liquid-crystalline alignment media.

Download or read book Solid state Deuterium and REDOR NMR Structural Studies of Spider Dragline Silk and a New Experiment for Measuring Multiple Heteronuclear Dipolar Couplings in Solids written by Carl August Michal and published by . This book was released on 1997 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Methods in Solid state NMR written by Paul Hodgkinson and published by Royal Society of Chemistry. This book was released on 2018-04-05 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-state NMR covers an enormous range of material types and experimental techniques. Although the basic instrumentation and techniques of solids NMR are readily accessible, there can be significant barriers, even for existing experts, to exploring the bewildering array of more sophisticated techniques. In this unique volume, a range of experts in different areas of modern solid-state NMR explain about their area of expertise, emphasising the “practical aspects” of implementing different techniques, and illustrating what questions can and cannot be addressed. Later chapters address complex materials, showing how different NMR techniques discussed in earlier chapters can be brought together to characterise important materials types. The volume as a whole focusses on topics relevant to the developing field of “NMR crystallography” – the use of solids NMR as a complement to diffraction crystallography. This book is an ideal complement to existing introductory texts and reviews on solid-state NMR. New researchers wanting to understand new areas of solid-state NMR will find each chapter to be the equivalent to spending time in the laboratory of an internationally leading expert, learning the hints and tips that make the difference between knowing about a technique and being ready to put it into action. With no equivalent on the market, it will be of interest to every solid-state NMR researcher (academic and postgraduate) working in the chemical sciences.

Download or read book Exploring Dipolar Coupling and the Chemical Shift for Structure Determination in Solids and in Liquid Crystals written by Robert Harold Havlin and published by . This book was released on 2002 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frustrated Lewis Pairs I written by Gerhard Erker and published by Springer. This book was released on 2014-07-08 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discovery of Frustrated Lewis Pairs: Intermolecular FLPs for Activation of Small Molecules, by Douglas W. Stephan Intramolecular Frustrated Lewis Pairs: Formation and Chemical Features, by Gerald Kehr, Sina Schwendemann, Gerhard Erker Frustrated Lewis Pair Mediated Hydrogenations, by Douglas W. Stephan, Gerhard Erker Amine-Borane Mediated Metal-Free Hydrogen Activation and Catalytic Hydrogenation, by Victor Sumerin, Konstantin Chernichenko, Felix Schulz, Markku Leskelä, Bernhard Rieger, Timo Repo Hydrogen Activation by Frustrated Lewis Pairs: Insights from Computational Studies, by Tibor András Rokob, Imre Pápai Quantum Chemistry of FLPs and Their Activation of Small Molecules: Methodological Aspects, by Birgitta Schirmer, Stefan Grimme Computational Design of Metal-Free Molecules for Activation of Small Molecules, Hydrogenation, and Hydroamination, by Zhi-Xiang Wang, Lili Zhao, Gang Lu, Haixia Li, Fang Huang Computational Studies of Lewis Acidity and Basicity in Frustrated Lewis Pairs, by Thomas M. Gilbert Solid-State NMR as a Spectroscopic Tool for Characterizing Phosphane - Borane Frustrated Lewis Pairs, by Thomas Wiegand, Hellmut Eckert, Stefan Grimme

Download or read book Solid State NMR III Organic Matter written by Bernhard Blümich and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-State NMR is a branch of Nuclear Magnetic Resonance which is presently experiencing a phase of strongly increasing popularity. The most striking evidence is the large number of contributions from Solid-State Resonance atNMR meetings, approaching that ofliquid state resonance. Important progress can be observed in three areas: Methodological developments, applications to inorganic matter, and applications to organic matter. These developments are intented to be captured in three volumes in this series, each of them being devoted to more or less one of these areas. The present volume on Solid-State NMR III is devoted mainly to organic matter. The recent developments of deuteron NMR and their applications are reviewed in the first chapter. Crosspolarization, MAS, and dynamic angle spinning are being explored for enhancement of information and sensitivity. In addition to the analysis of classical relaxation times and modern 2D spectra, detailed dynamic information becomes accessible from investigations of the relaxation time anisotropies. The second chapter examines cross-polarization in static and rotating solids under conditions of spin diffusion and thermal motion. The underlying dipole-dipole interaction is further exploited by the techniques described in the third chapter for studies of polymer-polymer miscibility. Short range techniques are discriminated from long-range techniques based on spin diffusion. The use ofthese techniques is illustrated by a case study ofPMMAJPVF blends. The last chapter addresses novel z methods and applications of two-dimensional exchange NMR for investigations of relative molecular orientations, polymer morphology, molecular dynamics, and macroscopic molecular order.

Download or read book Solid State NMR Spectroscopy written by Melinda J. Duer and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is for those familiar with solution-state NMR who are encountering solid-state NMR for the first time. It presents the current understanding and applications of solid-state NMR with a rigorous but readable approach, making it easy for someone who merely wishes to gain an overall impression of the subject without details. This dual requirement is met through careful construction of the material within each chapter. The book is divided into two parts: "Fundamentals" and "Further Applications." The section on Fundamentals contains relatively long chapters that deal with the basic theory and practice of solid-state NMR. The essential differences and extra scope of solid-state NMR over solution-state is dealt with in an introductory chapter. The basic techniques that all chapters rely on are collected into a second chapter to avoid unnecessary repetition later. Remaining chapters in the "Fundamentals" part deal with the major areas of solid-state NMR which all solid-state NMR spectroscopists should know about. Each begins with an overview of the topic that puts the chapter in context. The basic principles upon which the techniques in the chapter rely are explained in a separate section. Each of these chapters exemplifies the principles and techniques with the applications most commonly found in current practice. The "Further Applications" section contains a series of shorter chapters which describe the NMR techniques used in other, more specific areas. The basic principles upon which these techniques rely will be expounded only if not already in the Fundamentals part.

Download or read book Solving a 3D Structural Puzzle written by Casper Rønn Hoeck and published by Springer. This book was released on 2018-11-03 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores how nuclear magnetic resonance (NMR) spectroscopy may be used for spatial structural elucidation of novel compounds from fungal and synthetic sources. Readers will discover the exciting world of NOE (nuclear Overhauser effect), RDC (residual dipolar coupling) and J-coupling constants, both short- and long range. With emphasis on obtaining structural knowledge from these NMR observables, focus is moved from solving a static 3D structure to solving the structural space inhabited by small organic molecules. The book outlines the development and implementation of two Heteronuclear Multiple Bond Correlation-type NMR experiments, and the 3D structural elucidation of multiple known and novel compounds. In addition, a new method of back-calculating RDCs (allowing for more flexible structures to be investigated), and the synthesis and evaluation of novel chiral alignment media for ab initio determination of absolute stereochemistry of small molecules using RDCs are also included. Challenges that 3D structural generation of small compounds face are also covered in this work.

Download or read book Solid and Solution state NMR Techniques for the Investigation of Local Ordering in Membrane derived Solids Via Measurement of Scaled Dipolar Couplings written by Rebecca Shapiro Celik and published by . This book was released on 2013 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the low-viscosity samples used in solution-state nuclear magnetic resonance (NMR) spectroscopy, molecular tumbling occurs on a much faster timescale than a single NMR experiment. As a result, anisotropic interactions between the nuclei average to zero; and sharp, narrow, isotropic lineshapes are easily obtained. However, in systems with local order, rotational and translation mobility of molecules is significantly reduced. In this solid-state regime, anisotropic interactions are no longer motionally averaged, and three additional effects are observed that can severely complicate NMR spectra: heteronuclear and homonuclear dipolar couplings, and chemical shift anisotropy (CSA). Magic-angle spinning (MAS) is a solid-state NMR (ssNMR) technique that makes it possible to mechanically average these anisotropic effects to zero and acquire sharp, isotropic peaks analogous to those found in solution. However, the presence of dipolar couplings and CSA allows additional structural information about biomolecules to be extracted; so there is demand for NMR techniques that take advantage of anisotropic interactions. Alignment media, such as bicelle mixtures, are used to introduce a controllable degree of anisotropy for the purpose of collecting scaled dipolar couplings in ssNMRand residual dipolar couplings (RDCs) in solution state, and their composition can be tailored to optimize the degree of order they impose and therefore the degree to which dipolar couplings and other anisotropic interactions are motionally averaged. Altering the composition of an alignment medium can also influence the temperature range over which an aligned phase exists, which is beneficial in dealing with temperature sensitive biomolecules. Switched-angle spinning (SAS) is another NMR method aimed at analyzing anisotropic interactions in the structural studies of oriented biological solids. SAS combines the advantages of the magic angle spinning with the structural information provided by heteronuclear and homonuclear dipolar couplings and CSA by correlating isotropic chemical shifts in one dimension with anisotropic information in a second dimension. Finally, symmetry-based pulse sequences introduce sophisticated spin-space selection rules into MAS experiments that allow for reintroduction of only specific NMR interactions while suppressing others. Presented herein is current work on three related research efforts: the development and characterization of a new biologically-relevant alignment medium with increased thermal stability ideal for recovery of additional structural constraints from dipolar couplings and CSA in membrane proteins and peptides; simulation work and preliminary experiments laying the foundation for new variable-angle spinning (VAS) and switched-angle spinning (SAS) experiments optimized for structural studies of membrane proteins, peptides, and other biomolecules with local order induced by bicelles or other liquid-crystalline alignment media; and an investigation of an unusual chlorosulfolipid membrane component via a proton-detected local field experiment that utilizes a symmetry-based pulse sequence to selectively recouple heteronuclear dipolar couplings and CSA while prohibiting evolution of J-coupling, chemical shift, and homonuclear dipolar couplings.

Download or read book Solid State NMR Studies of Biopolymers written by Anne E. McDermott and published by John Wiley & Sons. This book was released on 2010-09-20 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: The content of this volume has been added to eMagRes (formerly Encyclopedia of Magnetic Resonance) - the ultimate online resource for NMR and MRI. The field of solid state NMR of biological samples [ssNMR] has blossomed in the past 5-10 years, and a cohesive overview of the technology is needed for new practitioners in industry and academia. This title provides an overview of Solid State NMR methods for studying structure dynamics and ligand-binding in biopolymers, and offers an overview of RF pulse sequences for various applications, including not only a systematic catalog but also a discussion of theoretical tools for analysis of pulse sequences. Practical examples of biochemical applications are included, along with a detailed discussion of the many aspects of sample preparation and handling that make spectroscopy on solid proteins successful. About EMR Handbooks / eMagRes Handbooks The Encyclopedia of Magnetic Resonance (up to 2012) and eMagRes (from 2013 onward) publish a wide range of online articles on all aspects of magnetic resonance in physics, chemistry, biology and medicine. The existence of this large number of articles, written by experts in various fields, is enabling the publication of a series of EMR Handbooks / eMagRes Handbooks on specific areas of NMR and MRI. The chapters of each of these handbooks will comprise a carefully chosen selection of articles from eMagRes. In consultation with the eMagRes Editorial Board, the EMR Handbooks / eMagRes Handbooks are coherently planned in advance by specially-selected Editors, and new articles are written (together with updates of some already existing articles) to give appropriate complete coverage. The handbooks are intended to be of value and interest to research students, postdoctoral fellows and other researchers learning about the scientific area in question and undertaking relevant experiments, whether in academia or industry. Have the content of this Handbook and the complete content of eMagRes at your fingertips! Visit: www.wileyonlinelibrary.com/ref/eMagRes View other eMagRes publications here

Download or read book The Handbook of Metabonomics and Metabolomics written by John C. Lindon and published by Elsevier. This book was released on 2011-08-11 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular biology operates at three levels – genes, proteins and metabolites. This book is unique in that it provides a comprehensive description of an approach (metabonomics) to characterise the endogenous metabolites in a living system, complementing gene and protein studies (genomics and proteomics). These "omics" methods form the basis for understanding biology at a systems level. The Handbook of Metabonomics and Metabolomics aims to be the definitive work on the rapidly expanding subjects of metabolic profiling, metabolite and biomarker identification, encompassing the fields of metabonomics and metabolomics. It covers the principles of the subject, the analytical and statistical techniques used and the wide variety of applications.* comprehensive description of an approach (metabonomics) to characterise the endogenous metabolites in a living system, complementing gene and protein studies* aims to be the definitive work on the rapidly expanding subjects of metabolic profiling, metabolite and biomarker identification* covers the principles of the subject, the analytical and statistical techniques used and the wide variety of applications.

Download or read book NMR of Quadrupolar Nuclei in Solid Materials written by Roderick E. Wasylishen and published by John Wiley & Sons. This book was released on 2012-12-19 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: NMR OF QUADRUPOLAR NUCLEI IN SOLID MATERIALS Over the past 20 years technical developments in superconducting magnet technology and instrumentation have increased the potential of NMR spectroscopy so that it is now possible to study a wide range of solid materials. In addition, one can probe the nuclear environments of many other additional atoms that possess the property of spin. In particular, it is possible to carry out NMR experiments on isotopes that have nuclear spin greater that 1⁄2 (i.e. quadrupolar nuclei). Since more that two-thirds of all NMR active isotopes are quadrupolar nuclei, applications of NMR spectroscopy with quadrupolar nuclei are increasing rapidly. The purpose of this handbook is to provide under a single cover the fundamental principles, techniques and applications of quadrupolar NMR as it pertains to solid materials. Each chapter has been prepared by an expert who has made significant contributions to out understanding and appreciation of the importance of NMR studies of quadrupolar nuclei in solids. The text is divided into three sections: The first provides the reader with the background necessary to appreciate the challenges in acquiring and interpreting NMR spectra of quadrupolar neclei in solids. The second presents cutting-edge techniques and methodology for employing these techniques to investigate quadrupolar nuclei in solids. The final section explores applications of solid-state NMR studies of solids ranging from investigations of dynamics, characterizations of biological samples, organic and inorganic materials, porous materials, glasses, catalysts, semiconductors and high-temperature superconductors. About EMR Handbooks The Encyclopedia of Magnetic Resonance (EMR) publishes a wide range of online articles on all aspects of magnetic resonance in physics, chemistry, biology and medicine. The existence-of this large number of articles, written by experts in various fields, is enabling the publication of a series of EMR Handbooks on specific areas of NMR and MRI. The chapters of each of these handbooks will comprise a carefully chosen selection of Encyclopedia articles. In consultation with the EMR Editorial Board, the EMR Handbooks are coherently planned in advance by specially-selected Editors, and new articles, are written (together with updates of some already existing articles) to give appropriate complete coverage. The handbooks are intended to be of value and interest to research students, postdoctoral fellows and other researchers learning about the scientific area in question and undertaking relevant experiments, whether in academia or industry. Have the content of this handbook and the complete content of the Encyclopedia of Magnetic Resonance at your fingertips! Visit: www.wileyonlinelibrary.com/ref/emr

Download or read book Amorphous Solid Dispersions written by Navnit Shah and published by Springer. This book was released on 2014-11-21 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers a comprehensive guide on the theory and practice of amorphous solid dispersions (ASD) for handling challenges associated with poorly soluble drugs. In twenty-three inclusive chapters, the book examines thermodynamics and kinetics of the amorphous state and amorphous solid dispersions, ASD technologies, excipients for stabilizing amorphous solid dispersions such as polymers, and ASD manufacturing technologies, including spray drying, hot melt extrusion, fluid bed layering and solvent-controlled micro-precipitation technology (MBP). Each technology is illustrated by specific case studies. In addition, dedicated sections cover analytical tools and technologies for characterization of amorphous solid dispersions, the prediction of long-term stability, and the development of suitable dissolution methods and regulatory aspects. The book also highlights future technologies on the horizon, such as supercritical fluid processing, mesoporous silica, KinetiSol®, and the use of non-salt-forming organic acids and amino acids for the stabilization of amorphous systems. Amorphous Solid Dispersions: Theory and Practice is a valuable reference to pharmaceutical scientists interested in developing bioavailable and therapeutically effective formulations of poorly soluble molecules in order to advance these technologies and develop better medicines for the future.

Download or read book NMR Spectroscopy of Biological Solids written by A. Ramamoorthy and published by CRC Press. This book was released on 2005-09-22 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, a myriad of techniques have shown that solid-state nuclear magnetic resonance (NMR) can be used in a broad spectrum of applications with exceptionally impressive results. Solid-state NMR results can yield high-resolution details on the structure and function of many important biological solids, including viruses, fibril-formin