Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Question
Chapter 19, Problem 19.20QAP
Interpretation Introduction
(a)
Interpretation:
The 1H and 19F spectra of FC2H should be predicted.
Concept introduction:
Spin-spin coupling is a phenomenon which is caused by the spin coupling between two chemically different nuclei which are NMR active. This effect is indicated through peak splitting in NMR spectra. Coupling constant is a measure of interactions between NMR active nuclei.
Interpretation Introduction
(b)
Interpretation:
The 1H and 19F spectra of CF3CH3 should be predicted.
Concept introduction:
Spin-spin coupling is a phenomenon which is caused by the spin coupling between two chemically different nuclei which are NMR active. This effect is indicated through peak splitting in NMR spectra. Coupling constant is a measure of interactions between NMR active nuclei.
Interpretation Introduction
(c)
Interpretation:
The 1H and 19F spectra of (CH3)CF should be predicted.
Concept introduction:
Spin-spin coupling is a phenomenon which is caused by the spin coupling between two chemically different nuclei which are NMR active. This effect is indicated through peak splitting in NMR spectra. Coupling constant is a measure of interactions between NMR active nuclei.
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Combine the chemical shifts, integrals, and spin-spin splitting patterns in NMRspectra with information from infrared and mass spectra to determine the structuresof organic compounds
(a) Calculate the energy difference between the two spin states of 1H and of 13C in a magnetic field of 6.8 T.
1H
4.0 1.91e-29
X J
13C
4.80e-33
X J
(b) What is the precession frequency of a 'H nucleus at this magnetic field? Of a 13C nucleus?
1H
4.0 290
MHz
13C
4.0 73
MHz
(c) At what magnetic field do protons precess at a frequency of 300. MHz?
[4.0 7.04
(a) Calculate the energy difference between the two spin states of 1H and of 13C in a magnetic field of 6.8 T.
1H
4.0
13C
4.0
J
(b) What is the precession frequency of a 1H nucleus at this magnetic field? Of a 13c nucleus?
1H
4.0 260
MHz
13C
(4.0 65
MHz
(c) At what magnetic field do protons precess at a frequency of 300. MHz?
4.0
T.
Chapter 19 Solutions
Principles of Instrumental Analysis
Ch. 19 - Prob. 19.1QAPCh. 19 - Prob. 19.2QAPCh. 19 - Prob. 19.3QAPCh. 19 - Prob. 19.4QAPCh. 19 - Prob. 19.5QAPCh. 19 - A nucleus has a spin quantum number of 7/2. How...Ch. 19 - Prob. 19.7QAPCh. 19 - Prob. 19.8QAPCh. 19 - Prob. 19.9QAPCh. 19 - Why is 133C-133C spin-spin splitting not observed...
Ch. 19 - Prob. 19.11QAPCh. 19 - Prob. 19.12QAPCh. 19 - Prob. 19.13QAPCh. 19 - What is a rotating frame of reference?Ch. 19 - How will E for an isolated 13C nucleus compare...Ch. 19 - Prob. 19.16QAPCh. 19 - Prob. 19.17QAPCh. 19 - Prob. 19.18QAPCh. 19 - Prob. 19.19QAPCh. 19 - Prob. 19.20QAPCh. 19 - Prob. 19.21QAPCh. 19 - Prob. 19.22QAPCh. 19 - Prob. 19.23QAPCh. 19 - Prob. 19.24QAPCh. 19 - Prob. 19.25QAPCh. 19 - Prob. 19.26QAPCh. 19 - Prob. 19.27QAPCh. 19 - Prob. 19.28QAPCh. 19 - Prob. 19.29QAPCh. 19 - Prob. 19.30QAPCh. 19 - The proton NMR spectrum in Figure 19.39 is for an...Ch. 19 - The proton NMR spectrum in Figure 19-40 is for a...Ch. 19 - Prob. 19.33QAPCh. 19 - Prob. 19.34QAPCh. 19 - Prob. 19.35QAPCh. 19 - From the proton NMR spectrum in Figure 19-44,...Ch. 19 - From the proton spectrum given in Figure 19-45,...Ch. 19 - Prob. 19.38QAPCh. 19 - Prob. 19.39QAPCh. 19 - Prob. 19.40QAPCh. 19 - Prob. 19.41QAPCh. 19 - Prob. 19.42QAP
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