31p And 13c Nmr Of Transition Metal Phosphine Complexes

Author : Paul S. Pregosin,Roland W. Kunz
Publisher : Springer Science & Business Media
Page : 164 pages
File Size : 51,5 Mb
Release : 2012-12-06
Category : Science
ISBN : 9783642488306

Get Book

31P and 13C NMR of Transition Metal Phosphine Complexes by Paul S. Pregosin,Roland W. Kunz Pdf

For almost a quarter of a century the words "nuclear magnetic reso nance" were synonymous with proton I,leasurements. During this period the literature abounded with a seemingly infinite variety of 1H NHR studies concerned primarily with carbon chemistry. Occasionally a "novel" nucleus was studied and, even in those early days, the poten- 13 14 31 19 tial offered by C, N, P and F was clearly recognized. Despite the allure, the technical difficulties involved in measuring some of these nuclei were far from trivial. Small magnetic moments and low natural abundance in combination with spin-spin coupling from other nuclei, mostly protons, resulted in a signal-to-noise problem whose severity effectively excluded the study of metal complexes with unfa vorable solubility characteristics. The first important breakthrough came with the advent of broad band 1H-decoupling. For example, the featureless broad 31p resonance associated with the commonly used ligand triphenyl phosphine is converted to a sharp, more readily ob served singlet when wide-band decoupling is employed (see Fig. 1). Despite this improvement investigation of more interesting molecules, such as catalytically active complexes was forced to await the devel opment of Fourier Transform methods since only with relatively rapid signal averaging methods could sufficient signal-to-noise ratios be achieved.

Author : Paul S. Pregosin
Publisher : Unknown
Page : 0 pages
File Size : 45,7 Mb
Release : 1979
Category : Electronic
ISBN : OCLC:1123846734

Get Book

31P and 13C NMR of Transition Metal Phosphine Complexes by Paul S. Pregosin Pdf

Author : Paul S. Pregosin,Roland Werner Kunz
Publisher : Unknown
Page : 156 pages
File Size : 46,7 Mb
Release : 1979
Category : Complex compounds
ISBN : OCLC:488687567

Get Book

31P and 31C NMR of Transition Metal Phosphine Complexes by Paul S. Pregosin,Roland Werner Kunz Pdf

Author : Anonim
Publisher : Unknown
Page : 252 pages
File Size : 46,8 Mb
Release : 1969
Category : Nuclear magnetic resonance
ISBN : UCLA:L0061008082

Get Book

NMR. by Anonim Pdf

Author : Anonim
Publisher : Springer Science & Business Media
Page : 242 pages
File Size : 53,8 Mb
Release : 2012-12-06
Category : Science
ISBN : 9783642877629

Get Book

Oxygen-17 and Silicon-29 by Anonim Pdf

Although it was shown very early [1] that the isotope 29Si is very valuable for NMR research, severe technical difficulties had to be overcome before silicon spectra could be recorded. This was due to the low sensitivity of the isotope resulting from its low gyro magnetic ratio, its low abundance and the rather long relaxation times. The introduction of the Fourier-Transform-Technique (FT-NMR) helped to surmount most of these problems, with the result, that more and more papers concerning silicon NMR appear. Thus, it seems now that most of the salient features of 29Si-NMR are known today. Some resume of the state of the art of 29Si_NMR have been reported [1-4]. Although the theory of 29Si-NMR is not yet understood beyond the basic features, it promises to be of value mainly for two reasons: 1. Silicon is strategically located in the Periodic Table of the elements between the elements carbon, aluminum and phosphorus. For an unified theory of chemical shifts and coupling constants of the heavier elements silicon NMR values will be important. 2. The normal coordination number of silicon is four. If the current view of the chemical shifts of the heavier elements is correct, then the paramagnetic part is dominant for the measured shift data. Two of the parameters used for the calcu lation of the paramagnetic part are bond orders and angles. Bond angles are rare ly determined experimentally with high precision.

Author : J. Mason
Publisher : Springer Science & Business Media
Page : 642 pages
File Size : 55,5 Mb
Release : 2012-12-06
Category : Science
ISBN : 9781461317838

Get Book

Multinuclear NMR by J. Mason Pdf

With the power and range of modern pulse spectrometers the compass of NMR spec troscopy is now very large for a single book-but we have undertaken this. Our book covers the Periodic Table as multinuclear spectrometers do, and introductory chapters are devoted to the essentials of the NMR experiment and its products. Primary products are chemical shifts (including anisotropies), spin-spin coupling constants, and relaxation times; the ultimate product is a knowledge of content and constitution, dynamic as well as static. Our province is chemical and biochemical rather than physical or technical; only passing reference is made to metallic solids or unstable species, or to practical NMR spectroscopy. Our aim is depth as well as breadth, to explain the fundamental processes, whether of nuclear magnetic shielding, spin-spin coupling, relaxation, or the multiple pulse sequences that have allowed the development of high-resolution studies of solids, multidimensional NMR spectroscopy, techniques for sensitivity enhancement, and so on. This book therefore combines the functions of advanced textbook and reference book. For reasonably comprehensive coverage in a single volume we have sum marized the information in tables and charts, and included all leading references.

Author : Graham Alan Webb
Publisher : Royal Society of Chemistry
Page : 360 pages
File Size : 54,9 Mb
Release : 1971
Category : Nuclear Magnetic Resonance
ISBN : 9780851869605

Get Book

Nuclear Magnetic Resonance Volume 9 by Graham Alan Webb Pdf

Annotation As a spectroscopic method, Nuclear Magnetic Resonance (NMR) has seen spectacular growth over the past two decades, both as a technique and in its applications. Today the applications of NMR span a wide range of scientific disciplines, from physics to biology to medicine. Each volume of Nuclear Magnetic Resonance comprises a combination of annual and biennial reports which together provide comprehensive of the literature on this topic. This Specialist Periodical Report reflects the growing volume of published work involving NMR techniques and applications, in particular NMR of natural macromolecules which is covered in two reports: "NMR of Proteins and Acids" and "NMR of Carbohydrates, Lipids and Membranes". For those wanting to become rapidly acquainted with specific areas of NMR, this title provides unrivalled scope of coverage. Seasoned practitioners of NMR will find this an in valuable source of current methods and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading authorities in the relevant subject areas, the series creates a unique service for the active research chemist, with regular, in-depth accounts of progress in particular fields of chemistry. Subject coverage within different volumes of a given title is similar and publication is on an annual or biennial basis.

Author : G A Webb
Publisher : Royal Society of Chemistry
Page : 360 pages
File Size : 43,5 Mb
Release : 2007-10-31
Category : Science
ISBN : 9781847553652

Get Book

Nuclear Magnetic Resonance by G A Webb Pdf

As a spectroscopic method, Nuclear Magnetic Resonance (NMR) has seen spectacular growth over the past two decades, both as a technique and in its applications. Today the applications of NMR span a wide range of scientific disciplines, from physics to biology to medicine. Each volume of Nuclear Magnetic Resonance comprises a combination of annual and biennial reports which together provide comprehensive of the literature on this topic. This Specialist Periodical Report reflects the growing volume of published work involving NMR techniques and applications, in particular NMR of natural macromolecules which is covered in two reports: "NMR of Proteins and Acids" and "NMR of Carbohydrates, Lipids and Membranes". For those wanting to become rapidly acquainted with specific areas of NMR, this title provides unrivalled scope of coverage. Seasoned practitioners of NMR will find this an in valuable source of current methods and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading authorities in the relevant subject areas, the series creates a unique service for the active research chemist, with regular, in-depth accounts of progress in particular fields of chemistry. Subject coverage within different volumes of a given title is similar and publication is on an annual or biennial basis.

Author : Viktor Iaroshenko
Publisher : John Wiley & Sons
Page : 224 pages
File Size : 44,7 Mb
Release : 2019-01-07
Category : Science
ISBN : 9783527672257

Get Book

Organophosphorus Chemistry by Viktor Iaroshenko Pdf

Filling the gap for an up-to-date reference that presents the field of organophosphorus chemistry in a comprehensive and clearly structured way, this one-stop source covers the chemistry, properties, and applications from life science and medicine. Divided into two parts, the first presents the chemistry of various phosphorus-containing compounds and their synthesis, including ylides, acids, and heterocycles. The second part then goes on to look at applications in life science and bioorganic chemistry. Last but not least, such important practical aspects as 31P-NMR and protecting strategies for these compounds are presented. For organic, bioinorganic, and medicinal chemists, as well as those working on organometallics, and for materials scientists. The book, a contributed work, features a team of renowned scientists from around the world whose expertise spans the many aspects of modern organophosphorus chemistry.

Author : J.W. Akitt,B. E. Mann
Publisher : CRC Press
Page : 400 pages
File Size : 50,7 Mb
Release : 2017-12-21
Category : Science
ISBN : 9781482268379

Get Book

NMR and Chemistry by J.W. Akitt,B. E. Mann Pdf

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.

Author : Peter W. Jolly
Publisher : Springer Science & Business Media
Page : 394 pages
File Size : 40,5 Mb
Release : 2013-11-11
Category : Science
ISBN : 9783662075333

Get Book

Ni Organonickel Compounds by Peter W. Jolly Pdf

This volume starts the updating of the information on organonickel chemistry, one of the most active areas of modern organometallic chemistry. It covers all mononuclear compounds containing one nickel-to-carbon bond. The main part is devoted to the family of planar NiII compounds, RNi(D)2X, which within 20 years has increased from about 250 to more than 1000 members. This research interest has been stimulated by the fact that many compounds insert various unsaturated species into the Ni-C bond to create new organonickel species. Moreover, these compounds are important as intermediates in many catalytic processes involving organic halides. Compounds containing h*2-bonded heteroalkene molecules including the C1 fragments CO2 and CS2, and related metallocyclic compounds are also emphasized in this volume. These types of compounds play an important role in a number of nickel-catalyzed co-oligomerization reactions involving unsaturated organic compounds. Most of the compounds are well-characterized by modern spectroscopic techniques. The various types of compounds are in most cases confirmed by X-ray diffraction. The author of these volumes, a member of the M lheim group, has made many contributions of his own and is eminently qualified to critically review this area of research.

Author : J. A. McCleverty,T.J. Meyer
Publisher : Newnes
Page : 17046 pages
File Size : 41,6 Mb
Release : 2003-12-03
Category : Science
ISBN : 9780080913162

Get Book

Comprehensive Coordination Chemistry II by J. A. McCleverty,T.J. Meyer Pdf

Comprehensive Coordination Chemistry II (CCC II) is the sequel to what has become a classic in the field, Comprehensive Coordination Chemistry, published in 1987. CCC II builds on the first and surveys new developments authoritatively in over 200 newly comissioned chapters, with an emphasis on current trends in biology, materials science and other areas of contemporary scientific interest.

Author : David G. Gorenstein
Publisher : Academic Press
Page : 619 pages
File Size : 40,8 Mb
Release : 2012-12-02
Category : Science
ISBN : 9780080918419

Get Book

Phosphorous-31 NMR by David G. Gorenstein Pdf

Phosphorous-31 NMR: Principles and Applications focuses on the evolution of phosphorus-31 nuclear magnetic resonance (NMR) as a widely applied spectroscopic probe of the structure and dynamics of phosphorus-containing compounds. The selection first offers information on the principles and empirical observations of phosphorus-31 chemical shifts and the principles and applications of phosphorus-31 spin-spin coupling constants. Discussions focus on introduction and basic principles, directly bonded phosphorus coupling constants, and two-bond and three-bond coupling constants. The text then ponders on phosphorus-31 NMR of enzyme complexes and paramagnetic probes of enzyme complexes with phosphorus-containing compounds. The manuscript elaborates on the use of chiral thiophosphates and the stereochemistry of enzymatic phosphoryl transfer and DNA and RNA conformations. Topics include helix-coil transitions, sequence dependence of double-stranded DNA conformations, dynamic behavior of RNA and DNA, biological and genetic significance, and stereochemical problems studied with chiral thiophosphates. The conformation and dynamics of nucleic acids and phosphoproteins, relaxation behavior of nucleic acids, and theory and applications of solid-state phosphorus-31 NMR to nucleic acids are also discussed. The selection is a valuable reference for readers interested in the principles and applications of phosphorus-31 nuclear magnetic resonance.

Author : D.E.C. Corbridge
Publisher : CRC Press
Page : 1476 pages
File Size : 49,9 Mb
Release : 2013-01-07
Category : Science
ISBN : 9781439840887

Get Book

Phosphorus by D.E.C. Corbridge Pdf

Over two decades have passed since the fifth edition of Phosphorus: Chemistry, Biochemistry and Technology. Major advances in chemistry, materials science, electronics, and medicine have expanded and clarified the role of phosphorus in both our everyday appliances and groundbreaking research. Significantly expanded, updated, and reorganized, this sixth edition organizes and explains vital phosphorus research and relevant information available in highly specialized reviews and references on select related topics. An authoritative and comprehensive review of phosphorus chemistry and related technology, Phosphorus: Chemistry, Biochemistry and Technology covers historical, academic, industrial, agricultural, military, biological, and medical aspects of phosphorous. Furthermore, it offers a starting point for more extended studies of the highly specialized branches of phosphorus chemistry. Although this book deals with a small fraction of the > 106 known phosphorus compounds, it thoroughly covers the simpler derivatives and most key compounds of economic, sociological, and biological importance. Extensively updated and expanded with tables, figures, equations, structural formulae, and references, it is ideal for scientists in related fields seeking a rapid introduction to phosphorus chemistry.

Author : R. Damadian
Publisher : Springer Science & Business Media
Page : 175 pages
File Size : 52,6 Mb
Release : 2013-03-09
Category : Medical
ISBN : 9783642876356

Get Book

NMR in Medicine by R. Damadian Pdf