Publication

Proton-coupled carbon-13 J spectra in the presence of strong coupling. II

Geoffrey Bodenhausen
1977
Journal Articles

Abstract

Proton-coupled 13C NMR spectra were studied by a technique which involves Fourier transformation of spin echo modulation. When the protons are strongly coupled, the "proton flip" version of this expt. generates a new form of 13C spectrum which is quite distinct from the multiplet structure of the conventional NMR spectrum. The transition frequencies and intensities are exactly sym. about the center frequency and some lines have neg. intensities. Exptl. spectra from the C2 site in pyridine are presented and analyzed by means of an iterative program derived from LAOCOON III. The resulting proton-C coupling consts. are in excellent agreement with those obtained by anal. of the conventional spectrum. The new program may also be used to calc. the echo modulation in strongly coupled homonuclear spin systems, and the echo modulation induced in heteronuclear systems by strongly nonresonant spins. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/8807c266-ddd1-4553-8493-d57560547805

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Geoffrey Bodenhausen
1977
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8807c266-ddd1-4553-8493-d57560547805

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 spectroscopy

Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique to observe local magnetic fields around atomic nuclei. This spectroscopy is based on the measurement of absorption of electromagnetic radiations in the radio frequency region from roughly 4 to 900 MHz. Absorption of radio waves in the presence of magnetic field is accompanied by a special type of nuclear transition, and for this reason, such type of spectroscopy is known as Nuclear Magnetic Resonance Spectroscopy.

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.

Related publications (32)

Proton-coupled carbon-13 J spectra in the presence of strong coupling. II

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