![]() ![]() 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. Arriving at J In a Duplet To calculate J for a duplet, simply subtract the lower value from the higher. ![]()
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