nmr of chemically exchanging systems

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Nmr Of Chemically Exchanging Systems

Author : Jerome Kaplan
ISBN : 9780323160643
Genre : Science
File Size : 51. 22 MB
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NMR of Chemically Exchanging Systems presents an integrated density matrix formalism for calculating NMR lineshapes for all types of exchanging systems. This book explores a variety of conditions, which is applicable to both liquids and liquid crystals. Organized into nine chapters, this book begins with an overview of the derivation of the absorption due to a single spin utilizing the classical Bloch equation as a means for introducing some of the concepts concerned in obtaining the absorption lineshape. This text then examines the derivation of the total density matrix equation. Other chapters consider the density matrix equation for a general exchanging system at high rf power and illustrate how one has to solve for all the elements of the density matrix. The final chapter presents some remarks on transients as applied to chemically exchanging systems. This book is a valuable resource for scientists and researchers who are interested in NMR spectroscopy.

Nuclear Magnetic Resonance

Author : G. A. Webb
ISBN : 9780854043521
Genre : Reference
File Size : 79. 30 MB
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For those wanting to become rapidly acquainted with specific areas of NMR, this title provides unrivalled scope of coverage.

Dynamic Nmr Spectroscopy

Author :
ISBN : 9783642669613
Genre : Science
File Size : 44. 76 MB
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Since the first successful NMR experiments in 1946 it was well appreciated that dynamic processes play an important role in the NMR spectroscopy of bulk matter [1]. Early theories on the dependence of the relaxation parameters Tl and T2 on the motions of nuclear spins were successful in explaining the dipolar broadening of the NMR signal in solids and the motional narrowing in liquids [2]. With the discovery of chemical shifts and spin-spin couplings another type of dynamical process affect ing the NMR line shape became apparent, the chemical exchange. As a consequence, dynamical NMR studies split into two groups differing not only in the dynamical topics but also in the method of investigation: physical studies of the motion of spins in liquids and solids by measurement of the relaxation times of single resonances and, on the other hand, chemical studies based on band shape analysis of NMR spectra recorded under steady state conditions. The two fields of research lost some of their basic differences with the development of the Fourier transform NMR method [3], which allows the measurement of relaxation times of different resonances at the same time, i. e. the study of differential motional behavior of different parts of mole cules, thus providing a new tool in conformational analyses. For example, informa tion can be obtained by this method on the relative importance of overall motions and internal motions [4].

Nmr In Biological Systems

Author : K.V.R. Chary
ISBN : 9781402066801
Genre : Science
File Size : 32. 50 MB
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During teaching NMR to students and researchers, we felt the need for a text-book which can cover modern trends in the application of NMR to biological systems. This book covers the entire area of NMR in Biological Sciences (Biomolecules, cells and tissues, animals, plants and drug design). As well as being useful to researchers, this is an excellent book for teaching a course on NMR in Biological Systems.

Nmr And Chemistry

Author : J.W. Akitt
ISBN : 0748743448
Genre : Science
File Size : 38. 37 MB
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Keeping mathematics to a minimum, this book introduces nuclear properties, nuclear screening, chemical shift, spin-spin coupling, and relaxation. It is one of the few books that provides the student with the physical background to NMR spectroscopy from the point of view of the whole of the periodic table rather than concentrating on the narrow applications of 1H and 13C NMR spectroscopy. Aids to structure determination, such as decoupling, the nuclear Overhauser effect, INEPT, DEPT, and special editing, and two dimensional NMR spectroscopy are discussed in detail with examples, including the complete assignment of the 1H and 13C NMR spectra of D-amygdain. The authors examine the requirements of a modern spectrometer and the effects of pulses and discuss the effects of dynamic processes as a function of temperature or pressure on NMR spectra. The book concludes with chapters on some of the applications of NMR spectroscopy to medical and non-medical imaging techniques and solid state chemistry of both I = F1/2 and I > F1/2 nuclei. Examples and problems, mainly from the recent inorganic/organometallic chemistry literature support the text throughout. Brief answers to all the problems are provided in the text with full answers at the end of the book.

Use Of Humic Substances To Remediate Polluted Environments From Theory To Practice

Author : Irina V. Perminova
ISBN : 1402032501
Genre : Science
File Size : 72. 97 MB
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Effective remediation of polluted environments is a priority in both Eastern and Western countries. In the U.S. and Europe, remediation costs generally exceed the net economic value of the land. As a result, scientists and engineers on both sides of the Atlantic have aggressively tried to develop novel technologies to meet regulatory standards at a fraction of the costs. In situ remediation shows considerable promise from both technical and economic perspectives. In situ technologies that deploy natural attenuating agents such as humic substances (HS) may be even more cost effective. Numerous studies have shown humics capable of altering both the chemical and the physical speciation of the ecotoxicants and in turn attenuate potential adverse environmental repercussions. Furthermore, the reserves of inexpensive humic materials are immense. Which suggests HS portend great promise as inexpensive amendments to mitigate the environmental impacts of ecotoxicants and as active agents in remediation. To elucidate emerging concepts of humics-based remediation technologies, we organized the NATO Advanced Research Workshop (ARW), entitled "Use of humates to remediate polluted environments: from theory to practice", held on September 23-29, 2002 in Zvenigorod, Russia (see the web-site http://www.mgumus.chem.msu.ru/arw).

Nuclear Magnetic Resonance Probes Of Molecular Dynamics

Author : R. Tycko
ISBN : 1402014597
Genre : Science
File Size : 80. 66 MB
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Nuclear Magnetic Resonance Probes of Molecular Dynamics describes the theoretical basis and experimental techniques that make modern NMR spectroscopy a powerful and flexible tool for probing molecular dynamics in chemical, physical, and biochemical systems. Individual chapters, written by leaders in the development and application of NMR from around the world, treat systems that range from synthetic polymers, liquid crystals, and catalysts to proteins and oligonucleotides and techniques that include deuterium NMR, magic angle spinning, multidimensional spectroscopy, and magnetic resonance imaging. A combination of elementary and advanced material makes the book a useful introduction to the field for students at the graduate level as well as an important reference for practising NMR spectroscopists.

Nuclear Magnetic Resonance Studies Of Chemical Exchange

Author : Kjell-Ivar Dahlqvist
ISBN : UCAL:B2684503
Genre :
File Size : 51. 39 MB
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Understanding Nmr Spectroscopy

Author : James Keeler
ISBN : 9781119964933
Genre : Science
File Size : 75. 63 MB
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This text is aimed at people who have some familiarity with high-resolution NMR and who wish to deepen their understanding of how NMR experiments actually ‘work’. This revised and updated edition takes the same approach as the highly-acclaimed first edition. The text concentrates on the description of commonly-used experiments and explains in detail the theory behind how such experiments work. The quantum mechanical tools needed to analyse pulse sequences are introduced set by step, but the approach is relatively informal with the emphasis on obtaining a good understanding of how the experiments actually work. The use of two-colour printing and a new larger format improves the readability of the text. In addition, a number of new topics have been introduced: How product operators can be extended to describe experiments in AX2 and AX3 spin systems, thus making it possible to discuss the important APT, INEPT and DEPT experiments often used in carbon-13 NMR. Spin system analysis i.e. how shifts and couplings can be extracted from strongly-coupled (second-order) spectra. How the presence of chemically equivalent spins leads to spectral features which are somewhat unusual and possibly misleading, even at high magnetic fields. A discussion of chemical exchange effects has been introduced in order to help with the explanation of transverse relaxation. The double-quantum spectroscopy of a three-spin system is now considered in more detail. Reviews of the First Edition “For anyone wishing to know what really goes on in their NMR experiments, I would highly recommend this book” – Chemistry World “…I warmly recommend for budding NMR spectroscopists, or others who wish to deepen their understanding of elementary NMR theory or theoretical tools” – Magnetic Resonance in Chemistry

Inclusion Chemistry With Zeolites Nanoscale Materials By Design

Author : Norman Herron
ISBN : 0792336062
Genre : Medical
File Size : 26. 36 MB
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Zeolites, with their crystalline microporous structure, are cordial hosts to a wide variety of guests. Traditional absorption techniques, as well as X-ray diffraction and spectroscopic techniques, have contributed to a better understanding of the nature of the host materials' characteristic cavities, cages and channels. The same techniques, coupled with powerful computational methods, have given new insights into the interactions of guest molecules with their hosts. In turn, this has led to new developments in the direction of structure during zeolite synthesis as well as potentially new applications of guest-host materials. The 11 chapters of Inclusion Chemistry with Zeolites: Nanoscale Materials by Design represent the cutting edge of modern research, describing some of the most recent studies on structure direction in synthesis, characterization techniques, computational aspects, coordination and organometallic chemistry, photochemistry, and electronic and optical materials. The diversity and wide utility of its presentation will inspire creative readers to create their own nanoscale materials by design'.

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