Wavenumber (cm1)

Assignment

As grown

Annealed at 150˚C for 1 h

Annealed at 150˚C for 2 h

457.05

456.62

454.16

C-N-C (skeletal bending)

458.02

949.78

949.78

949.78

Symmetric stretching of C-N

1287.27

1287.31

1286.89

CH3 Rocking

1384.66

1384.59

1384.33

O-H bending

1415.52

1415.58

1415.63

Symmetric bending of CH3

1483.98

1484.89

1484.25

Asymmetric bending of CH3

2957.35

2958.49

2957.37

Symmetric stretching of CH3

3023.88

3025.2

3024.71

Asymmetric stretching of CH3

3476.12

3477.09

3443.77

O-H Vibration of water molecule