Usually the NMR spectrum shows more signals than different nuclei in the sample due to line splitting and couplings between the nuclei. The amount of splitting (number of lines) and magnitude of the ...

This phenomenon is known as the chemical shift. In addition, the resonance frequencies are purturbed by the existance of neighboring NMR active nuclei, in a manner dependent on the bonding electrons ...

d) The indirect spin-spin coupling is a magnetic interaction between at least two NMR nuclei which is transmitted by bonding electrons. This interaction (sometimes also called J coupling) is only ...

NMR spectroscopy may theoretically appear less ... that essentially turns off the coupling between spins, causing clean and intense signals and spectra with enhanced resolution.