Question

Regarding chemical shift, what is the advantage of the chemical shift scale?

• How is it determined? What is the advantage of the chemical shift scale?

Answer 1

I assume that you are familiar with the chemical shifts in ppm as a ‘sigma scale’.

1) The chemical shift is independent of the NMR spectrometer's frequency. A chemical shift measured in Hertz will change from 500 MHz NMR spectrometer to 700 MHz NMR spectrometer but if it is measured in ppm will be the same in both the spectrometer.

2) The chemical shift variations are at Hz or kHz level and hence reporting in MHz is easy.