Answered: What effect does increasing the…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

What effect does increasing the operating frequency of a ¹H NMR
spectrum have on each value: (a) the chemical shift in 5; (b) the
frequency of an absorption in Hz; (c) the magnitude of a coupling
constant J in Hz?

Expert Solution

Step 1

(a)

The chemical shift calculated by using the below formula

Chemical shift = $\frac{Observed chemical shift (in Hzz) downfield from TMS}{frequency of the NMR spectrometer (in MHz)}$

If there is an increase in the operating frequency, then there is no change in the chemical shift value.

(b)

The stronger the operating frequency, the larger the energy difference between the two nuclear spin states, and required higher frequency of an absorption.

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What effect does increasing the operating frequency of a 1H NMRspectrum have on each value: (a) the chemical shift in 5; (b) thefrequency of an absorption in Hz; (c) the magnitude of a couplingconstant J in Hz?