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?
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?
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 =
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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