论坛上不少朋友对NMR驰豫的问题感兴趣，现上载一本关于NMR弛豫的专著供有兴趣者研读。 该书虽然是为化学家所写，但还是需要有一些物理学和NMR背景知识。该书对在实验室工作的NMR工作者是有用的。 这本书可能是教授化学家NMR驰豫技术的第一本专著。2005年出版，还是比较新的。 Practical NMR relaxation for chemists Author: Bakhmutov, Vladimir , I. Publisher: John Wiley & Sons, Ltd. Format: Adobe (Encrypted PDF) Content Language: English Contents 1 How and Why Nuclei Relax 1 1.1 Nucleus in an External Magnetic Field 4 1.2 Spin–Lattice and Spin–Spin Nuclear Relaxation 7 1.2.1 Macroscopic Magnetization: Relaxation Times T1 and T2 8 1.3 Molecular Motions as the Reason for Nuclear Relaxation 11 1.3.1 Correlation Times and Activation Energies of Molecular Motions 13 1.3.2 Isotropic and Anisotropic Molecular Motions 15 Bibliography 18 2 How to Measure NMR Relaxation Times 19 2.1 Exponential and Non-exponential Nuclear Relaxation 20 2.2 Measurements of Spin–Lattice Relaxation Times 20 2.3 Measurements of Selective and Biselective T1 Times 24 2.4 Determination of T1ρ and T2 27 2.5 Preparation of Samples for Relaxation Experiments 28 Bibliography 29 3 Errors in Determinations of Relaxation Times 31 3.1 Instrumental Errors 32 3.2 Incorrect Parameters for T1, T2 Measurements and T1, T2 Calculations 33 3.3 Coupled Nuclear Relaxation 34 3.4 Chemical Exchange 37 Bibliography 42 4 NMR Relaxation by Dipole–Dipole and Quadrupole Interactions 43 4.1 Intramolecular Dipole–Dipole Relaxation: Homo- and Heteronuclear Dipolar Coupling and the Spectral Density Function 44 4.2 How to Reveal the Presence of the Dipolar Mechanism 48 4.2.1 NOE as a Test for Dipole–Dipole Nuclear Relaxation 48 4.2.2 Evaluations of the Dipolar Contributions from Selective and Nonselective T1 Times 52
Contents ... Contents vii 4.3 Intermolecular Dipole–Dipole Interactions 53 4.4 Electric Field Gradients at Quadrupolar Nuclei 53 4.5 Nuclear Quadrupole Coupling Constant as Measure of the Electric Field Gradient 54 4.6 Quadrupole Relaxation 56 Bibliography 57 5 Relaxation by Chemical Shift Anisotropy, Spin–Rotation Relaxation, Scalar Relaxation of the Second Kind and Cross-mechanisms 59 5.1 Relaxation by Chemical Shift Anisotropy 59 5.2 Spin–Rotation Relaxation 63 5.3 Interference Mechanisms of Nuclear Relaxation 64 5.4 Scalar Relaxation of the Second Kind 65 Bibliography 67 6 Nuclear Relaxation in Molecular Systems with Anisotropic Motions 69 6.1 Spin–Lattice Nuclear Relaxation in Ellipsoidal Molecules: Temperature Dependences of T1 Times 70 6.2 How to Reveal Anisotropic Molecular Motions in Solution 74 viii Contents 6.3 Nuclear Relaxation in the Presence of Correlation Time Distributions 76 Bibliography 80 7 1H T1 Relaxation Diagnostics in Solution 81 7.1 Revealing Weak Intermolecular Interactions by T1 Time Measurements in Solution 82 7.2 T1 Studies of Exchange in Simple Molecular Systems 87 7.3 Structural 1H T1 Criterion 89 7.4 Partially Relaxed NMR Spectra 92 Bibliography 94 8 Internuclear Distances from 1H T1 Relaxation Measurements in Solution 97 8.1 X−H Distances: Metal–Hydride Bond Lengths 98 8.1.1 How to Determine Metal–Hydride Bond Lengths by Standard 1H T1 Measurements 101 8.1.2 Metal–Hydride Bond Lengths by 1H T1sel and 1H T1min Measurements 104 8.2 Proton–Proton Distances by Standard 1H T1 Measurements 108 8.3 H−H Distances by T1sel/T1bis Measurements 111 8.4 H...H Distances in Intermediates 115
11 Relaxation of Nuclei Other Than 1H and 2H and Specific Relaxation Experiments 155 11.1 Chemical Shift Anisotropies and Nuclear Quadrupole Coupling Constants from T1 Times of Heavy Nuclei in Solution 156 11.2 Multinuclear Relaxation Approaches to Complexation, Association and H-bonding 159 11.3 23Na Relaxation in Solutions of Complex Molecular Systems 162 11.4 Character of Molecular Motions from 17O and 2H T1 Relaxation in Solution 165 11.5 Two-dimensional T1 and T1ρ NMR Experiments 166 11.6 Chemical Exchange in Complex Molecular Systems from 15N Relaxation in Solution 168 11.7 R1/R2 Method 170 11.8 Cross-correlation Relaxation Rates and Structures of Complex Molecular Systems in Solution 172 11.9 Variable-field Relaxation Experiments 174 Bibliography 176 12 Paramagnetic NMR Relaxation 179 12.1 Theoretical Basis of Paramagnetic Relaxation Enhancement 179 12.2 Paramagnetic Relaxation Rate Enhancements in the Presence of Chemical Exchange 185 12.3 Structural Applications of Paramagnetic Relaxation Rate Enhancement 187 12.4 Kinetics of Ligand Exchange via Paramagnetic Relaxation Rate Enhancement 191 12.5 Longitudinal Electron Relaxation Time at Paramagnetic Centers from Variable-high-field NMR Experiments 193 Bibliography 195
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