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.

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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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
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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