Phosphorous 31 NMR

Author: David G. Gorenstein
Publisher: Academic Press
ISBN: 0080918417
Format: PDF, ePub, Docs
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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.

Handbook of Phosphorus 31 Nuclear Magnetic Resonance Data 1990

Author: John C. Tebby
Publisher: CRC Press
ISBN: 1351362038
Format: PDF, ePub
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To fully utilize Nuclear Magnetic Resonance (NMR) spectroscopy, a comprehensive and well-organized compilation of NMR data is necessary. While compilations have been available for other important NMR nuclei, such as carbon and fluorine, no comprehensive collection of data has been prepared for phosphorus-until now. The CRC Handbook of Phosphorus-31 Nuclear Magnetic Resonance Data provides a collection of 31P NMR chemical shifts for nearly 20,000 organic and inorganic phosphorus compounds. Each class of phosphorus compound is discussed. Bond types, stereochemistry (with the exception of metal complexes), media, important coupling constants, and data sources are included. The information is systematically organized according to coordination state, the atoms bound to phosphorus, and their connectivities. A comprehensive series of bar charts is also included to allow structure types to be assigned to chemical shift data. This handbook is an invaluable resource for all scientists working with phosphorus compounds, including chemists, biochemists, medical researchers, and pharmaceutical chemists.

A Guide to Organophosphorus Chemistry

Author: Louis D. Quin
Publisher: John Wiley & Sons
ISBN: 9780471318248
Format: PDF, ePub, Docs
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An authoritative and comprehensive introduction to organophosphoruschemistry The broad, exciting field of organophosphorus chemistryhas grown tremendously over the last few decades, with a wealth ofopportunities for research and applications development. A Guide toOrganophosphorus Chemistry offers chemists in academia and industrycomplete, up-to-date coverage of the fundamentals with an eye onfuture developments in this area. Internationally recognizedauthority Louis D. Quin extends his experienced perspective andinsight on the topic by: * Surveying the most important phosphorus-containing functionalgroups * Including representative methods of synthesis, plus references todetailed synthetic procedures * Outlining advances in stereochemical aspects of phosphoruschemistry * Covering areas of current research, such as unusual coordinationstates, heterocycles, applications of 31P-NMR, and otherspectroscopic methods * Providing numerous references to important review articles andrecent literature * Presenting electronic mechanisms and reactive intermediates whereestablished * Discussing the importance of phosphorus compounds in livingsystems and in agricultural applications Liberally illustrated with equations and structural formulas, AGuide to Organophosphorus Chemistry presents a virtuallyunparalleled introduction to the subject matter, making it anindispensable instructional tool for aspiring chemists andpracticing chemists alike.

NMR Principles and Applications to Biomedical Research

Author: Jay W. Pettegrew
Publisher: Springer Science & Business Media
ISBN: 1461233003
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Nuclear magnetic resonance (NMR) is having an enormous liTIpact on biomedical research both at the basic science and clinical levels. In order to appreciate the elegance and power of this technology a historical perspective is in order. In 1924 Pauli suggested that hydrogen nuclei might possess a magnetic IIlOlllent. This was in fact confinned by Rabbi in 1939 who demonstrated that a beam of hydrogen molecules in the presence of a magnetic field could be mutated by radio frequency fields resonating at the Iarmor frequency. 'Ihe first successful NMR experiments in condensed matter were independently conducted in late 1945 by Purcell, Torrey and PoUnd and by Bloch, Hansen and Packard. 'Ihe Purcell group detected proton NMR in solid paraffin and the Bloch group detected proton in liquid water. Bloch and Purcell received the Nobel Prize in physics in 1952 for these observations . Until about 1952, studies of liquids and solids with broad resonance lines dominated the field of NMR. However, the reports of 3 1 P NMR chemical shifts in several corrpounds in 1949 by Khight, of 14 N resonances in several ions by Proctor and Yu in 1950, and of 1 9 F resonances in several corrpounds in 1950 by Dickinson led to the development of high resolution NMR in Itquids. since the molecular motions in liquids result in very narrow lines compared to those in solids, :much smaller chemical shifts could be detected.

Thermal Stability of Engineering Heterochain Thermoresistant Polymers

Author: Kalugina
Publisher: CRC Press
ISBN: 906764417X
Format: PDF, Docs
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This book presents investigation results of thermal transformations in thermoresistant polymers: polysulfones, polyester-imides, aliphatic-aromatic polyimides and polyamides, liquid-crystal aromatic co-polyesters, polyphenylquinoxalines at temperatures of materials and articles processing and operation. An important result of investigations is the determination of thermooxidative degradation regularities for aliphatic-aromatic heterochain polymers and description of the degradation mechanism. The applied aspect of this work is the approach to stabilization of thermoresistant polymers and composite materials derived from them using additives and analysis of the mechanism of high-temperature inhibited oxidation. The book presents results which have been obtained through many years of research until recently, mostly obtained by scientists of G.S. Petrov Research Institute of Polymeric Materials (Moscow, Russia) – one of the leading Institutes in this branch - which have not been available in international scientific publications before.