Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Proton Magnetic Relaxation in Methyl Substituted Hydrocarbons
Author: Proton magnetic relaxation in N-methyl- γbutyrolactam and hexameth ylphosphoric triamide solutions containing Mn(II) perchlorate. :Prb Proton relaxation times in ammonia-cyanide solutions containing Ni(II) ions
Author: Tzeng-ming ChenPublisher:
ISBN:
Category : Nuclear magnetism
Languages : en
Pages : 242
Book Description
Quadrupolar relaxation effects in methyl-substituted ammonium ions as determined by h-1 nuclear magnetic resonance
Author: J. D. HallidayNuclear Science Abstracts
Author: Hindered Internal Rotation in Some Substituted N-methyl Thioureas by Proton Magnetic Resonance Spectroscopy
Author: Erick L. MayThe Proton Relaxation and Overhauser Effect in the Nuclear Magnetic Resonance Spectra of Some Amides
Author: S. BrownsteinPublisher:
ISBN:
Category :
Languages : en
Pages : 15
Book Description
The relaxation behavior of some amides was investigated in their high resolution spectra by the direct saturation-recovery and Overhauser effect methods. The recovery curves and steady-state Overhauser effects were obtained for solutions of dimethylformamide with double- and triple-resonance irradiations. The results were analyzed for 3- and 4-spin systems and the values of relaxation parameters were calculated. It was shown that for dimethylformamide the one-exponential recovery curve approximation gives the T1 values with a precision better than experimental error (plus or minus 2%). The observed difference in relaxation times for methyl group protons was explained by different correlation times and more restricted rotation of 1 of the groups. The correlation times for dipole-dipole interactions of methyl groups with the formyl proton were also evaluated with some reasonable assumptions. The change of the relaxation rate of N-methyl protons in C6H6 and C6D6 solutions was explained by formation of the collision complex with amide molecules and specific intermolecular dipole-dipole proton interaction. This effect could be useful for determination of the cis- and trans-conformations in N-methyl substituted amides and peptides as an absolute method because it does not require measurements on both isomers. (Author).
Index to Theses Accepted for Higher Degrees in the Universities of Great Britain and Ireland
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 416
Book Description
Carbon-13 NMR Spectroscopy
Author: J StothersPublisher: Elsevier
ISBN: 0323145507
Category : Science
Languages : en
Pages : 575
Book Description
Carbon-13 NMR Spectroscopy focuses on the potential of 13C techniques and the practical difficulties associated with the detection of 13C NMR absorption. This monograph includes a descriptive presentation of 13C shielding results that has been adopted with emphasis on the structural and stereochemical aspects. Organized into four parts encompassing 11 chapters, this book starts with an overview of the characteristics of the NMR signals derived from compounds containing 13C nuclei in natural abundance that are inherently much weaker than those exhibited by protons. This monograph then compares the primary characteristics of 13C NMR with the more familiar proton methods. Other chapters consider the 13C spectra of pyridine, pyridazine, pyrimidine, pyrazine, s-triazine, and s-tetrazine. The final chapter deals with the effects of solute–solvent interactions on the shieldings of other nuclei. This monograph is intended for organic chemists, graduate students, and researchers in various branches of chemistry with an interest in 13C NMR methods as another approach to chemical problems.
Index to Theses Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 810
Book Description
Nuclear Magnetic Resonance Volume 9
Author: Graham Alan WebbPublisher: Royal Society of Chemistry
ISBN: 0851869602
Category : Nuclear Magnetic Resonance
Languages : en
Pages : 360
Book Description
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.