Publication

Evidence for dipolar cross-correlation from triple-quantum-filtered two-dimensional exchange NMR spectroscopy

Geoffrey Bodenhausen
1988
Journal Articles

Abstract

Cross-correlation between pairs of dipole-dipole interactions may lead to a partial conversion of longitudinal Zeeman magnetization into longitudinal three-spin order, which can be obsd. selectively by using a triple-quantum filter in conjunction with two-dimensional exchange expts. The resulting TQF-NOESY method (triple-quantum filtered nuclear Overhauser effect spectroscopy) provides information about angles subtended by internuclear vectors. [on SciFinder (R)]

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Geoffrey Bodenhausen
1988
Journal Articles

Abstract

Official source

Related concepts (16)

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.

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 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.

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Evidence for dipolar cross-correlation from triple-quantum-filtered two-dimensional exchange NMR spectroscopy

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