|
FTIR spectral (cm−1) | Assignment |
|
CPA |
|
3600–3150 | O–H stretching vibrations |
3070 | Aromatic C–H stretching vibrations |
2975 | |
2939 | |
2878 | |
2802 | Aliphatic C–H stretching vibrations |
2756 | |
2739 | |
2677 | |
2491 | Hydrogen bond stretching vibrations |
1739 | C=O stretching vibrations (for ester and carboxylic acid) |
1631 | C=O stretching vibrations (amide I band) |
1584 | N–H stretching vibrations (amide II band) |
1493–1451 | Aromatic C=C stretching vibrations |
1412 | C–N stretching vibrations (amide III band) |
1332 | Aliphatic C–H in-plane bending vibrations (for CH3) |
1265 | C–O–C symmetric stretching vibrations (for ester) |
1171 | C–O–C asymmetric stretching vibrations (for ester) |
1079 | C–O–C asymmetric stretching vibrations (for ether) |
1036 | C–O–C symmetric stretching vibrations (for ether) |
|
CTA |
|
3600–3150 | O–H stretching vibrations |
~3071 | Aromatic C–H stretching vibrations |
2976 | |
2941 | |
2879 | |
2803 | Aliphatic C–H stretching vibrations |
2757 | |
2739 | |
2677 | |
2492 | Hydrogen bond stretching vibrations |
1712 | C=O stretching vibrations (for ester and carboxylic acid) |
1605 | C=O stretching vibrations (amide I band) |
~1570 | N–H stretching vibrations (amide II band) |
1503–1476 | Aromatic C=C stretching vibrations |
1433 | C–N stretching vibrations (amide III band) |
1312 | Aliphatic C–H in-plane bending vibrations (for CH3) |
1246 | C–O–C symmetric stretching vibrations (for ester) |
1156 | C–O–C asymmetric stretching vibrations (for ester) |
1069 | C–O–C asymmetric stretching vibrations (for ether) |
1036 | C–O–C symmetric stretching vibrations (for ether) |
|