Chapter 16, Problem 16.43P

Interpretation Introduction

Interpretation:

The frequency difference between the two proton signals for $300\text{-MHz}$ NMR spectrometer and for $90\text{-MHz}$ NMR spectrometer is to be given.

Concept introduction:

A spectrometer’s operational frequency (${\text{ν}}_{\text{operational}}$) is the frequency at which a proton absorbs radiation when subjected to the spectrometer’s magnetic field. It is the frequency at which the spectrometer operates. The reference compound usually used for ${}^1\text{H}$ NMR spectroscopy is TMS; it is expressed as ${\text{ν}}_{\text{reference}}$. The frequency of the sample is expressed as ${\text{ν}}_{\text{sample}}$. Chemical shift is calculated as the ratio of the difference in frequencies of the ${\text{ν}}_{\text{sample}}$ and ${\text{ν}}_{\text{reference}}$ and the operational frequency ${\text{ν}}_{\text{operational}}$.