1. Answer BOTH parts a) and b). a) i) Explain the difference between spin-lattice relaxation (T₁) and spin-spir relaxation (T₂). ii) Deuterated acetone, (CD3)2CO, is a common solvent for NMR spectroscopy. Sketch the 13C{¹H} NMR spectrum of this solvent. Label and explain any coupling in your spectrum. iii) Predict the structure of the residual protio-solvent species observed in the ¹H NMR spectrum of (CD3)2CO.
1. Answer BOTH parts a) and b). a) i) Explain the difference between spin-lattice relaxation (T₁) and spin-spir relaxation (T₂). ii) Deuterated acetone, (CD3)2CO, is a common solvent for NMR spectroscopy. Sketch the 13C{¹H} NMR spectrum of this solvent. Label and explain any coupling in your spectrum. iii) Predict the structure of the residual protio-solvent species observed in the ¹H NMR spectrum of (CD3)2CO.
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
![1.
Answer BOTH parts a) and b).
a)
i)
Explain the difference between spin-lattice relaxation (T₁) and spin-spin
relaxation (T2).
ii) Deuterated acetone, (CD3)2CO, is a common solvent for NMR
spectroscopy. Sketch the 1³C{¹H} NMR spectrum of this solvent.
Label and explain any coupling in your spectrum.
iii) Predict the structure of the residual protio-solvent species observed in
the ¹H NMR spectrum of (CD3)2CO.
b)
OH
A
B
C
max 260 nm 295 nm
i) Suggest electronic transitions that can be attributed to the absorptions
reported for compounds A and B, respectively.
ii)
With the aid of diagrams explain why B absorbs at a lower energy to A.
iii)
Explain why compound C possesses a charge transfer transition.
iv)
For compound C explain why changing solvent polarity influences the
wavelength of the charge transfer absorption.
-CEZ](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb6a0610a-89d1-41ac-8d8e-986c258399ec%2F16186161-fbe8-4419-98e3-53f7b8f98148%2Fskl3fp_processed.png&w=3840&q=75)
Transcribed Image Text:1.
Answer BOTH parts a) and b).
a)
i)
Explain the difference between spin-lattice relaxation (T₁) and spin-spin
relaxation (T2).
ii) Deuterated acetone, (CD3)2CO, is a common solvent for NMR
spectroscopy. Sketch the 1³C{¹H} NMR spectrum of this solvent.
Label and explain any coupling in your spectrum.
iii) Predict the structure of the residual protio-solvent species observed in
the ¹H NMR spectrum of (CD3)2CO.
b)
OH
A
B
C
max 260 nm 295 nm
i) Suggest electronic transitions that can be attributed to the absorptions
reported for compounds A and B, respectively.
ii)
With the aid of diagrams explain why B absorbs at a lower energy to A.
iii)
Explain why compound C possesses a charge transfer transition.
iv)
For compound C explain why changing solvent polarity influences the
wavelength of the charge transfer absorption.
-CEZ
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