Question

If you could help explain the chart above, that would be awesome.

4. Analyze the IR spectrum of your product, filling in the table below. You should utilize your course textbook (pp. 764-766), if you need assistance. Please note that the frequency given below should be exact (one number), not a range. Use the frequency of the center of the band at its strongest point. Then, on the spectrum itself, mark the characteristic bands at their strongest point with a tick mark and assign your peaks (write OH stretch, C-O stretch, aromatic -C-H stretch or aromatic C-C stretch (if they are present) under the tick mark). Staple the assigned spectrum to the back of your postlab report. Vibration Frequency (cm1) Description Triphenylmethanol OH stretch CO stretch Aromatic -C-H stretch Aromatic C-C stretch IR Spectroscopy: Four Regions of IR: 4000 to 2500 cm: N-H, C-H, and O-H bond stretches a) N-H and O-H absorb around 3600 - 3000 cm b) C-H around 3000 cm (above 3000 cm aromatic below 3000 cm aliphatic) 2. 2500 to 2000 cm: triple bonds absorb nitriles and alkynes 3.2000 to 1500 cm: double bonds absorb C-O, C-N, and C-C a) carbonyl groups specifically - 1750 - 1680 cm b) C-C 1680-1640 cm 4.Region below 1500 cmr is the fingerprint region. Taken from McMurry, J. Fundamentals of Organic Chemistry, 4th ed.; Brooks/Cole Publishing Pacific Grove, 1998; Chapter 13 and Jones, Maitland Organic Chemistry, 2nd ed.; Norton Publishers, New York, 2001 For your spectrum, some important functional group absorptions are: Aromatic Compounds: -C-H stretch C-C stretch 3080-3020 cm1 1600-1580 cm1 Alcohols: O-H stretch (aqueous) 3550-3300 cm1 C-O stretch 1150-1050 cm1 IR Spectrum of Final Product Assign the peaks of [O-H stretch], IC-O stretch], [aromatic-C-H stretch] and aromatic C-C stretch] (if they are present) in the spectrum below. Attach your spectrum with assigned peaks to the end of your finished post-lab 6. 100 E 50 4000 35003000 2500 2000 1500 1000 500 Wavenumber/cm Show all your work in ink (not pencil).

Answer 1

We are getting a peak around 3500 cm-1, which is due to OH stretching hing.

Peak around 2900 cm-1 is due to C-H stretching.

Peak around 1400 cm-1 is due to O-H bending vibration of alcohol.

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