In a 400 MHz 1H NMR spectrometer, a proton resonates at 1560 Hz higher than that of tetramethylsilane. The chemical shift value of this proton

Q. In a 400 MHz ¹H NMR spectrometer, a proton resonates at 1560 Hz higher than that of tetramethylsilane. The chemical shift value of this proton is___________ppm. (Round off to one decimal place)

(Chemical shift of tetramethylsilane is fixed at zero ppm)

Solution:

The chemical shift of Nuclear Magnetic Resonance Spectroscopy is the relative resonant frequency of the nucleus with respect to the magnetic field.

δ(ppm) = ѴHz / ѴMHz , 

δ(ppm)  δ(ppm) = 1560Hz / 400 MHz 

δ(ppm) = 3.9 ppm.