Publication

Artifacts in two-dimensional J spectra

Geoffrey Bodenhausen
1980
Journal Articles

Abstract

The application of inhomogeneous or miscalibrated refocusing pulses to coupled spin systems leads to erroneous spin-echo spectra. There are 2 distinct sources of errors: the imperfect refocusing of the obsd. magnetization and the imperfect spin inversion of the coupling partners. In 2-dimensional spin-echo spectroscopy, these errors lead to addnl. signals that should be identified as artifacts to avoid misinterpretations. [on SciFinder (R)]

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Geoffrey Bodenhausen
1980
Journal Articles

Abstract

Official source

Related concepts (18)

J-coupling

In nuclear chemistry and nuclear physics, J-couplings (also called spin-spin coupling or indirect dipole–dipole coupling) are mediated through chemical bonds connecting two spins. It is an indirect interaction between two nuclear spins that arises from hyperfine interactions between the nuclei and local electrons. In NMR spectroscopy, J-coupling contains information about relative bond distances and angles. Most importantly, J-coupling provides information on the connectivity of chemical bonds.

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.

Coupling reaction

In organic chemistry, a coupling reaction is a type of reaction in which two reactant molecules are bonded together. Such reactions often require the aid of a metal catalyst. In one important reaction type, a main group organometallic compound of the type R-M (where R = organic group, M = main group centre metal atom) reacts with an organic halide of the type R'-X with formation of a new carbon-carbon bond in the product R-R'. The most common type of coupling reaction is the cross coupling reaction. Richard F.

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Artifacts in two-dimensional J spectra

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