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3. Caffeine has a structure given by : CHy What IR peaks/bands would you expect based on the topics covered in class for this molecule (you can ignore the Nitrogen bond peaks for now) also sketch the spectra with peaks you expect.

3. Caffeine has a structure given by : CHy What IR peaks/bands would you expect based on the topics covered in class for this molecule (you can ignore the Nitrogen bond peaks for now) also sketch the spectra with peaks you expect.

Chemistry
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
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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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**3. Caffeine has a structure given by:** A diagram of the molecular structure of caffeine is shown. It includes a bicyclic molecule with two nitrogen atoms embedded in a pyrimidine ring connected to a five-membered ring. There are three methyl (CH₃) groups attached to the nitrogen and carbon atoms. **Question:** What IR peaks/bands would you expect based on the topics covered in class for this molecule (you can ignore the Nitrogen bond peaks for now)? Also, sketch the spectra with peaks you expect. --- **Analysis:** - **C=O Stretch:** The carbonyl group (C=O) is expected to give a strong peak around 1700 cm⁻¹ due to its characteristic stretching vibration. - **CH₃ Stretch:** Methyl groups usually show C-H stretching vibrations around 2900-3000 cm⁻¹. - **C=C Stretch:** Aromatic or conjugated C=C bonds often show peaks between 1500-1600 cm⁻¹. - **Other Considerations:** Overtones and combinations of the above might be present, leading to smaller peaks elsewhere in the spectrum. For a visual depiction, a graph of the IR spectrum should include a strong C=O peak near 1700 cm⁻¹, weaker peaks in the 2900-3000 cm⁻¹ range for CH₃ groups, and a peak between 1500-1600 cm⁻¹ for C=C stretches, with the x-axis representing the wavenumber (cm⁻¹) and the y-axis representing the transmittance or absorbance.
Transcribed Image Text:**3. Caffeine has a structure given by:** A diagram of the molecular structure of caffeine is shown. It includes a bicyclic molecule with two nitrogen atoms embedded in a pyrimidine ring connected to a five-membered ring. There are three methyl (CH₃) groups attached to the nitrogen and carbon atoms. **Question:** What IR peaks/bands would you expect based on the topics covered in class for this molecule (you can ignore the Nitrogen bond peaks for now)? Also, sketch the spectra with peaks you expect. --- **Analysis:** - **C=O Stretch:** The carbonyl group (C=O) is expected to give a strong peak around 1700 cm⁻¹ due to its characteristic stretching vibration. - **CH₃ Stretch:** Methyl groups usually show C-H stretching vibrations around 2900-3000 cm⁻¹. - **C=C Stretch:** Aromatic or conjugated C=C bonds often show peaks between 1500-1600 cm⁻¹. - **Other Considerations:** Overtones and combinations of the above might be present, leading to smaller peaks elsewhere in the spectrum. For a visual depiction, a graph of the IR spectrum should include a strong C=O peak near 1700 cm⁻¹, weaker peaks in the 2900-3000 cm⁻¹ range for CH₃ groups, and a peak between 1500-1600 cm⁻¹ for C=C stretches, with the x-axis representing the wavenumber (cm⁻¹) and the y-axis representing the transmittance or absorbance.
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