Vladimir I. Bakhmutov

Practical Nuclear Magnetic Resonance Relaxation for Chemists (eBook, PDF)

• Format: PDF

Produktbeschreibung

This book demonstrates how NMR relaxation can be applied for structural diagnostics of chemical compounds, recognition of weak intermolecular interactions, determinations of internuclear distances and lengths of chemical bonds when compounds under investigation can exist only in solutions. * Written as a textbook for chemists, demanding little background in physics and NMR * Its practical approach helps the reader to apply the techniques in the lab * First book to teach NMR Relaxation techniques to chemists

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Produktdetails

• Verlag: John Wiley & Sons
• Seitenzahl: 216
• Erscheinungstermin: 11. April 2005
• Englisch
• ISBN-13: 9780470094471
• Artikelnr.: 37290541

Autorenporträt

Dr. Vladimir I. Bakhmutov is a professional NMR spectroscopist at the Department of Chemistry, Texas A&M University, USA. He is also the author of 220 scientific publications including reviews and book chapters.

Inhaltsangabe

Preface.
Chapter 1. How and why nuclei relax.
1.1. Nucleus in the magnetic field.
1.2. Spin-lattice and spin-spin nuclear relaxation.
1.2.1. Macroscopic magnetization: relaxation times T1 and T2.
1.3. Molecular motions as reason of nuclear relaxation.
1.3.1. Correlation times and activation energies of Molecular Motions.
1.3.2. Isotropic and anisotropic molecular motions.
1.4. Bibliography for Chapter 1.
Chapter 2. How to measure the NMR relaxation times.
2.1. Exponential and non-exponential nuclear relaxation.
2.2. Measurements of spin-lattice relaxation times.
2.3. Measurements of selective and bi-selective T1 times.
2.4. Determinations of T1( and T2 times.
2.5. Preparation of samples for relaxation experiments.
2.6. Bibliography to Chapter 2.
Chapter 3. Errors in Determinations of Relaxation Times.
3.1. Instrumental errors.
3.2. Incorrect parameters for T1, T2 measurements and T1, T2 calculations.
3.3 Coupled nuclear relaxation.
3.4. Chemical exchanges.
3.5. Bibliography to Chapter 3.
Chapter 4. NMR relaxation by dipole-dipole and quadrupole interactions.
4.1. The intramolecular dipole-dipole relaxation: homo- and hetero-nuclear
dipolar coupling and the spectral density function.
4.2. Haw to reveal the presence of the dipolar mechanisms.
4.2.1. NOE as a test for dipole-dipole nuclear relaxation.
4.2.2. Evaluations of the dipolar contributions from selective and
non-selective T1 times.
4.3. Intermolecular dipole-dipole interactions.
4.4. Electric field gradients at quadrupolar nuclei.
4.5. Nuclear quadrupole coupling constant as a measure of the electric
field gradient.
4.6. Quadrupole relaxation.
4.7. Bibliography to Chapter 4.
Chapter 5. Relaxation by chemical shift anisotropy, spin-rotation
relaxation, scalar relaxation of the second kind and cross-mechanisms.
5.1. Relaxation by chemical shift anisotropy.
5.2. Spin-rotation relaxation.
5.3. Interference mechanisms of nuclear relaxation.
5.4. The scalar relaxation of the second kind.
5.5 Bibliography to Chapter 5.
Chapter 6. Nuclear relaxation in molecular systems with anisotropic
motions.
6.1. Spin-lattice nuclear relaxation in ellipsoid molecules: Temperature
dependences of T1times.
6.2. How to reveal anisotropic molecular motions in solutions.
6.3. Nuclear relaxation in the presence of correlation time distributions.
6.4. Bibliography to Chapter 6.
Chapter 7. 1H T1 relaxation diagnostics in solutions.
7.1. Revealing weak intermolecular interactions by T1 time measurements in
solutions.
7.2. T1 studies of exchanges in simple molecular systems.
7.3. Structural 1H T1 criterion.
7.4. Partially-relaxed NMR spectra.
7.5. Bibliography to Chapter 7.
Chapter 8. Internuclear distances from the 1H T1 relaxation measurements in
solutions.
8.1. X...H distances: metal - hydride bond lengths.
8.1.1. How to determine metal-hydride bond lengths by standard 1H T1
measurements.
8.1.2. Metal-hydride bond lengths by 1H T1sel and 1H T1min times
measurements.
8.2. Proton-proton distances by standard T1 measurements.
8.3. H-H distances from T1sel / T1bis measurements.
8.4. H-H distances in intermediates.
8.5. Analyzing the errors in 1H T1 determinations of internuclear
distances.
8.6. Bibliography to Chapter 8.
9. Chapter 9: Deuterium quadrupole coupling constants from 2H T1 relaxation
measurements in solutions.
9.1. How to determine DQCC values.
9.2. DQCC values from the 2H T1 times measurements in solutions (fast
motional regime).
9.3. DQCC values via 2H T1min measurements in solutions.
9.4. Errors in DQCC determinations.
9. 5. Bibliography to Chapter 9.
Chapter 10. Spin-lattice 1H and 2H relaxation in mobile groups.
10.1. 1H T1 times and H-H distances in the presence of fast vibrations and
librations.
10.2. 1H T1 times and H-H distances in the presence of fast rotational
diffusion.
10.3. The spectral density function for high-amplitude librations.
10.4. 900-jumps in four-fold potential.
10. 5. Deuterium spin-lattice NMR relaxation in mobile molecular fragments.
10.6. Bibliography to Chapter 10.
Chapter 11. Relaxation of other nuclei (than 1H and 2H) and specific
relaxation experiments.
11.1. Chemical shift anisotropies and nuclear quadrupole coupling constants
from T1 times of heavy nuclei in solutions.
11.2. Multinuclear relaxation approaches to complexation, association and
H-bonding.
11.3. Na relaxation in solutions of complex molecular systems.
11. 4. Character of molecular motions from 17O and 2H T1 relaxation in
solutions.
11.5. 2D T1 and T1( NMR experiments.
11.6. Chemical exchanges in complex molecular systems from 15N nuclear
relaxation in solutions.
11.7. R1/R2 method.
11.8. Cross-correlation relaxation rates and structure of complex molecular
systems in solutions.
11.9. Variable - field relaxation experiments.
11.10. Bibliography to Chapter 11.
Chapter 12. Paramagnetic NMR relaxation.
12.1. Theoretical basics of the paramagnetic relaxation enhancement.
12.2. Paramagnetic relaxation rate enhancements in the presence of chemical
exchanges.
12.3. Structural applications of paramagnetic relaxation rate enhancements.
12.4. Kinetics of ligand exchanges via paramagnetic relaxation rate
enhancements.
12.5. Longitudinal electron relaxation time in paramagnetic centers from
variable-high field NMR experiments.
12.6. Bibliography to Chapter 12.
Concluding remarks.
Subject Index.

Rezensionen

"!appropriate for use in an advanced undergraduate or graduate level course on this topic...an excellent starting point for an investigator who would like to begin using relaxation--based NMR experiments." (Journal of Natural Products, January 2006) "Bakhmutova s book gives a relatively low--level introduction to relation measurements and their uses in describing dynamical processes!" (Journal of the American Chemical Society, May 25, 2005)