CHE-313 Reporting IR and nmr spectra

Report the results of infrared and nmr spectroscopy in tabular form. See example below:

For the nmr:

1. Draw the structure of the compound and label the groups of hydrogens that give rise to each signal using a, b, c ... (let a = most up-field).

2. Make a table showing the chemical shift, integration and splitting pattern for each group of hydrogens assigned to the structure.

example: ethoxybenzene Ph-O-CH₂CH₃

c b a

a 1.3 ppm (3H triplet)    

b 3.9 ppm (2H quartet)

c 6.6-7.2 ppm (5H complex)

For the IR:

Make a table listing in decreasing order all of the absorbances and identify those that are important.

example: ethoxybenzene

frequency (cm-) interpretation

3040 C-H stretch unsaturation, Ar-H

3000

2940 C-H stretch saturation

1600 C=C stretch, aromatic ring

1580

1500 C=C stretch, aromatic ring

1480 C-H bend, saturated

1390 " " "

1300

1240

1170

1120 C-O stretch, ether

1050

880

800 C-H out of plane bend -

750 mono-substitution

690