9. The variation with temperature of the H chemical shifts of [18]annulene in solution is as shown below. Comment as fully as possible on this behaviour and on the linewidths in the temperature ranges -60 °C to +20 °C and +70 °C to 110 °C. (From 1990 Advanced Paper.)
9. The variation with temperature of the H chemical shifts of [18]annulene in solution is as shown below. Comment as fully as possible on this behaviour and on the linewidths in the temperature ranges -60 °C to +20 °C and +70 °C to 110 °C. (From 1990 Advanced Paper.)
Chemistry
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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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not sure exactly what is causing the peak to converge at high temperature. I'm guessing that for digmagnetic moment to be induced the plane must be perpendicular to the appled magnetic field but at high temperature the annulene rotate too fast that the plane can never really perpendicular to the applied magnetic field?
![9.
The variation with temperature of the 1H chemical shifts of (18]annulene in
solution is as shown below. Comment as fully as possible on this behaviour and on the
linewidths in the temperature ranges -60 °C to +20 °C and +70 °C to 110 °C. (From 1990
Advanced Paper.)
93
5-2
-30
-60
-20
+20
+60
TrC
Sippm](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4e8d900c-4d09-4c04-b997-c1d5d3399d77%2Fbc1a143b-1bd2-427a-8e9d-3f96a5c0c79a%2Fstuok0d_processed.jpeg&w=3840&q=75)
Transcribed Image Text:9.
The variation with temperature of the 1H chemical shifts of (18]annulene in
solution is as shown below. Comment as fully as possible on this behaviour and on the
linewidths in the temperature ranges -60 °C to +20 °C and +70 °C to 110 °C. (From 1990
Advanced Paper.)
93
5-2
-30
-60
-20
+20
+60
TrC
Sippm
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