tho2 bonelnl slasd sol saisvoxins1.Figure 3. Caffeine structural formulaFigure 4. Caffeine Molecular ModelWavenumber/ cmTypes of bonds inmoleculeNotesF00G SPAO110sidens0031-00100-ST604020 l40003600 3400 3200 3000 2800 2600 240022002000१80017001600150014001300120011001000 900 800 700 600 500 400Wavenunber jam-1Figure 1 IR Spectrum of Caffeine bobluow bieBased on your list of IR absorbances, pick three or four peaks in the diagnostic region (1500-4000 cm1) andassign the type of bond based on your table above. Remember that peaks cannot be precisely assigned.Peak (cm) BondPeak (cm) BondPeak (cm) BondPeak (cm) Bond Exercise for Basic Infrared SpectroscopyNameDateExample:HFigure 1 Structural FormulaFigure 2 Molecular modelTypes of bonds inmoleculeWavenumber/ cm1NotesPresent in most organic compoundsSpectrum was taken in gas phase, so no H-bonding (thus "free" O-H)No diagnostic valueDifficult to interpretC-H3000-2850O-H (free)- 3600C-C single bondVariableC-O single bond1400-1000This spectrum matches what you might expect for the compound shown above, since there is a peak ataround 2900-3000 cm1 that would correspond to the C-H bonds in the compound, a peak at about3600 cm that represents free OH (in other words, the OH isn't hydrogen-bonded to neighboringmolecules as it would be if it were in the liquid phase, which would broaden the peak and shift it tobetween 3000 and 3400 cm'). There are also peaks between 1050 and 1400 that could be due to theC-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, beaware that certain functional groups will have specific wavelengths for their C=O bonds. Use the table in themodifications document to help you to recognize the functional groups associated with the C=O bonds. Listthe appropriate functional group in the "Notes" area, e.g.: C=O, 1750-1715 cm1, Esters

Caffeine is a stimulant that can be obtained from the natural sources such as coffee and tea. It…

tho02 bonelni slas sol aibvox lgma Figure 3. Caffeine structural formula Figure 4. Caffeine Molecular Model Wavenumber/ cm Types of bonds in molecule Notes 110 sidens 100- ST 60 40 3600 3400 32003000 2800 2600 240022002000 1800 1700 16001500 1400 1300 1200 1100 1000 900 B00 700 600 500 400 Wavenunber jan-1 4000 Figure 1'IR Spectrum of Caffeine biew Based on your list of IR absorbances, pick three or four peaks in the diagnostic region (1500-4000 cm) 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

tho02 bonelni slas sol aibvox lgma Figure 3. Caffeine structural formula Figure 4. Caffeine Molecular Model Wavenumber/ cm Types of bonds in molecule Notes 110 sidens 100- ST 60 40 3600 3400 32003000 2800 2600 240022002000 1800 1700 16001500 1400 1300 1200 1100 1000 900 B00 700 600 500 400 Wavenunber jan-1 4000 Figure 1'IR Spectrum of Caffeine biew Based on your list of IR absorbances, pick three or four peaks in the diagnostic region (1500-4000 cm) 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

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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2 infrared spectra are on the back of this page. a. Draw an arrow to the O-H peak and label it. b. Draw an arrow to the C=O peak and label it.
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