Coupling constant

Definition

The coupling constant (denoted as J) in Nuclear Magnetic Resonance (NMR) spectroscopy is a measure of the interaction strength between neighboring nuclear spins, influencing the splitting pattern in an NMR spectrum. It is expressed in hertz (Hz) and provides information about the spatial relationship and number of bonds separating adjacent atoms.

Related terms

Spin–Spin Splitting: The phenomenon in NMR spectroscopy where nuclear magnetic moments interact with each other, causing peaks to split into multiple components.

Chemical Shift: A measure of how much the magnetic field at an atom differs from a reference field, influenced by the electronic environment surrounding that atom.

Multiplicity: The number of peaks observed in a split NMR signal, determined by the number of adjacent interacting nuclei plus one