|
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) |
|
