![]() ![]() What is the coupling constant J value for CIS? J or scalar coupling between magnetic nuclei (otherwise termed nuclear spins) is coupling via the intervening network of chemical bonds and depends on interaction between the nuclear spins and bonding electron spins. What does the J stand for in J-coupling?ĭefinition. Matching it up with other nearly-identical coupling constants elsewhere in the spectrum usually tells you which protons are near which others. The coupling constant J is pretty much the peak-to-peak distance, usually reported in Hz. The peaks within a triplet or quadruplet all have the same spacing, so you’ll only need to calculate this value once. If the second peak results in a value of 502.68, for example, the value for J would be 2.02 Hz.
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