Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Question
tho2 bonelnl slasd sol saisvox ins 1. Figure 3. Caffeine structural formula Figure 4. Caffeine Molecular Model Wavenumber/ cm Types of bonds in molecule Notes F00G SPAO 110 sidens 0031-00 100- ST 60 40 20 l 4000 3600 3400 3200 3000 2800 2600 240022002000 १80017001600150014001300120011001000 900 800 700 600 500 400 Wavenunber jam-1 Figure 1 IR Spectrum of Caffeine bobluow bie Based on your list of IR absorbances, pick three or four peaks in the diagnostic region (1500-4000 cm1) and assign the type of bond based on your table above. Remember that peaks cannot be precisely assigned. Peak (cm) Bond Peak (cm) Bond Peak (cm) Bond Peak (cm) Bond
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Transcribed Image Text:tho2 bonelnl slasd sol saisvox ins 1. Figure 3. Caffeine structural formula Figure 4. Caffeine Molecular Model Wavenumber/ cm Types of bonds in molecule Notes F00G SPAO 110 sidens 0031-00 100- ST 60 40 20 l 4000 3600 3400 3200 3000 2800 2600 240022002000 १80017001600150014001300120011001000 900 800 700 600 500 400 Wavenunber jam-1 Figure 1 IR Spectrum of Caffeine bobluow bie Based on your list of IR absorbances, pick three or four peaks in the diagnostic region (1500-4000 cm1) and assign the type of bond based on your table above. Remember that peaks cannot be precisely assigned. Peak (cm) Bond Peak (cm) Bond Peak (cm) Bond Peak (cm) Bond
Exercise for Basic Infrared Spectroscopy Name Date Example: H Figure 1 Structural Formula Figure 2 Molecular model Types of bonds in molecule Wavenumber/ cm1 Notes Present in most organic compounds Spectrum was taken in gas phase, so no H- bonding (thus "free" O-H) No diagnostic value Difficult to interpret C-H 3000-2850 O-H (free) - 3600 C-C single bond Variable C-O single bond 1400-1000 This spectrum matches what you might expect for the compound shown above, since there is a peak at around 2900-3000 cm1 that would correspond to the C-H bonds in the compound, a peak at about 3600 cm that represents free OH (in other words, the OH isn't hydrogen-bonded to neighboring molecules as it would be if it were in the liquid phase, which would broaden the peak and shift it to between 3000 and 3400 cm'). There are also peaks between 1050 and 1400 that could be due to the C-O and C-C bonds, but peaks in the "fingerprint region" (below 1500 cm1) are difficult to assign. When looking at the molecules in the following problems, in addition to noting the types of bonds present, be aware that certain functional groups will have specific wavelengths for their C=O bonds. Use the table in the modifications document to help you to recognize the functional groups associated with the C=O bonds. List the appropriate functional group in the "Notes" area, e.g.: C=O, 1750-1715 cm1, Esters
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Transcribed Image Text:Exercise for Basic Infrared Spectroscopy Name Date Example: H Figure 1 Structural Formula Figure 2 Molecular model Types of bonds in molecule Wavenumber/ cm1 Notes Present in most organic compounds Spectrum was taken in gas phase, so no H- bonding (thus "free" O-H) No diagnostic value Difficult to interpret C-H 3000-2850 O-H (free) - 3600 C-C single bond Variable C-O single bond 1400-1000 This spectrum matches what you might expect for the compound shown above, since there is a peak at around 2900-3000 cm1 that would correspond to the C-H bonds in the compound, a peak at about 3600 cm that represents free OH (in other words, the OH isn't hydrogen-bonded to neighboring molecules as it would be if it were in the liquid phase, which would broaden the peak and shift it to between 3000 and 3400 cm'). There are also peaks between 1050 and 1400 that could be due to the C-O and C-C bonds, but peaks in the "fingerprint region" (below 1500 cm1) are difficult to assign. When looking at the molecules in the following problems, in addition to noting the types of bonds present, be aware that certain functional groups will have specific wavelengths for their C=O bonds. Use the table in the modifications document to help you to recognize the functional groups associated with the C=O bonds. List the appropriate functional group in the "Notes" area, e.g.: C=O, 1750-1715 cm1, Esters
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