NMR Data Analysis

Chemical Shift Correlation Graphics

Note: Figures show typical chemical shifts for nuclei influenced by a single structural feature. When nuclei are influenced by more than one structural feature, the influence on chemical shift is essentially cumulative.


¹H NMR Coupling Constants

Coupling constants are described by their J value, which is the distance between each peak in a split signal. The unit for J values is Hz and equals the change in chemical shift (in ppm) multiplied by the magnet strength (in Hz). Generally, the J value is measured directly from the NMR spectrum.

J value = (Δ in ppm)  x  (magnet strength in Hz)


Coupling Constants for Cis/Trans Alkenes


Coupling Constants for Aromatic Protons


NMR Solvent Data