80 Prlap_ sultf 75 70 65 60 40 35 4000 2500 2000 Wavenumbers (cm-1) 1500 1000 50

Question

80 Prlap_ sultf 75 70 65 60 40 35 4000 2500 2000 Wavenumbers (cm-1) 1500 1000 500 ue Mar 27 20:04:58 2018 (GMT-06:00) IND PEAKS: Spectrum: Region: Absolute threshold: 78.660 Sensitivity: Peak list: br/ap_sulf 4000.00 400.00 50 Position: 401.91 Intensity: 77.096 Position: 414.72 Intensity: 74.155 Position: 423.32 Intensity: 77.128 Position: 505.57 Intensity: 56.491 Position: 528.37 Intensity: 64.838 Position: 692.36 Intensity: 48.896 Position: 751.72 Intensity: 46.399 Position 879.66 Intensity: 56.080

Explanation / Answer

In the aniline molecule, primary amine group is connected to the phenyl ring. The IR stretching analysis for characteristic bands of the aniline can be done as:

3346.74 cm-1 = stretching frequency for primary amino groups N-H stretching.

3208.15 cm-1 = stretching frequency for phenyl ring C-H stretching (at ortho position).

3030.46 cm-1 = stretching frequency for phenyl ring C-H stretching (at meta and para position).

1617.41 cm-1 =  stretching frequency for phenyl ring C=C stretching (aromatic system)

1599.62 cm-1 = stretching frequency for primary amino groups N-H bending.

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