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What (who) is data coupling - definition
![−CH<sub>2</sub>−]] hydrogens are coupling with each other, resulting in a triplet and quartet respectively.](https://commons.wikimedia.org/wiki/Special:FilePath/1H NMR Ethanol Coupling shown.svg?width=200 "−CH<sub>2</sub>−]] hydrogens are coupling with each other, resulting in a triplet and quartet respectively.")
![An elastic coupling (for connecting a [[windsurfing]] sail rig to the board)](https://commons.wikimedia.org/wiki/Special:FilePath/Windsurfing equipment 2008 46.jpg?width=200 "An elastic coupling (for connecting a [[windsurfing]] sail rig to the board)")
 - Angular Misalignment.jpg?width=200 "Increasing number of coils allows for greater angular misalignment")
Wikipedia
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. It is responsible for the often complex splitting of resonance lines in the NMR spectra of fairly simple molecules.
J-coupling is a frequency difference that is not affected by the strength of the magnetic field, so is always stated in Hz.
