Publication

Relaxation-allowed cross-peaks in two-dimensional NMR correlation spectroscopy

Geoffrey Bodenhausen
1989
Journal Articles

Abstract

An anal. was made of the effects of nonexponential transverse relaxation during the free precession periods of 2-dimensional NMR expts. The presence of cross-correlation between various interactions that cause relaxation, such as chem. shift anisotropy and dipole-dipole interactions, may lead to the creation of spin-ordered states that make coherence transfer processes possible in spite of the absence of scalar, dipolar or quadrupolar splittings. The principal example discussed in the context of 2-dimensional correlation expts. is the occurrence of cross-peaks between 2 spins which are not scalar coupled to one another. The misinterpretation of these novel effects can represent a pitfall to the NMR spectroscopist, while their correct interpretation may provide useful evidence about the spatial arrangement of the nuclei. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/85254cc4-9405-4859-afd9-0ed4a2fd2a8c

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Geoffrey Bodenhausen
1989
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/85254cc4-9405-4859-afd9-0ed4a2fd2a8c

About this result

Related concepts (32)

Two-dimensional nuclear magnetic resonance spectroscopy

Two-dimensional nuclear magnetic resonance spectroscopy (2D NMR) is a set of nuclear magnetic resonance spectroscopy (NMR) methods which give data plotted in a space defined by two frequency axes rather than one. Types of 2D NMR include correlation spectroscopy (COSY), J-spectroscopy, exchange spectroscopy (EXSY), and nuclear Overhauser effect spectroscopy (NOESY). Two-dimensional NMR spectra provide more information about a molecule than one-dimensional NMR spectra and are especially useful in determining the structure of a molecule, particularly for molecules that are too complicated to work with using one-dimensional NMR.

Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus. This process occurs near resonance, when the oscillation frequency matches the intrinsic frequency of the nuclei, which depends on the strength of the static magnetic field, the chemical environment, and the magnetic properties of the isotope involved; in practical applications with static magnetic fields up to ca.

Nuclear Overhauser effect

The nuclear Overhauser effect (NOE) is the transfer of nuclear spin polarization from one population of spin-active nuclei (e.g. 1H, 13C, 15N etc.) to another via cross-relaxation. A phenomenological definition of the NOE in nuclear magnetic resonance spectroscopy (NMR) is the change in the integrated intensity (positive or negative) of one NMR resonance that occurs when another is saturated by irradiation with an RF field. The change in resonance intensity of a nucleus is a consequence of the nucleus being close in space to those directly affected by the RF perturbation.

Related publications (2)

Relaxation-allowed cross-peaks in two-dimensional NMR correlation spectroscopy

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