Publication

Two-dimensional correlation of directly and remotely connected transitions by z-filtered COSY

Geoffrey Bodenhausen
1986
Journal Articles

Abstract

An expt. is described which uses essentially the same pulse sequence as 2-dimensional (2D) exchange spectroscopy (NOESY), but where the flip angles of the 2 pulses that precede and follow the mixing period tm are small (b .simeq.20 Deg). Use of a NOESY-like sequence is proposed, where tm is chosen to be too short to allow exchange phenomena to play a role, and serves merely to eliminate coherence-transfer pathways through single-, multiple-, and zero-quantum coherences, while retaining only transfer processes by way of longitudinal magnetization, in the manner of z filters. Illustrative 2D z-filtered correlation spectra (z-COSY) showing coherence transfer between directly connected transitions (q = 0) of the 4 arom. protons of salicylic acid in CDCl3 with 10% DMSO-d6. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/44b16036-b9d8-4e19-97cd-b4e1411f85c7

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Geoffrey Bodenhausen
1986
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/44b16036-b9d8-4e19-97cd-b4e1411f85c7

About this result

Related concepts (20)

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.

Coherence (physics)

In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Physical sources are not strictly monochromatic: they may be partly coherent. Beams from different sources are mutually incoherent. When interfering, two waves add together to create a wave of greater amplitude than either one (constructive interference) or subtract from each other to create a wave of minima which may be zero (destructive interference), depending on their relative phase.

Spectroscopy

Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter waves and acoustic waves can also be considered forms of radiative energy, and recently gravitational waves have been associated with a spectral signature in the context of the Laser Interferometer Gravitational-Wave Observatory (LIGO).

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Two-dimensional correlation of directly and remotely connected transitions by z-filtered COSY

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