| Assigned peak | Cur | Cur-Al |
| The C-O-C stretching of alkyl aryl ether stretching frequency | 1029 cm−1 | 1026 cm−1 |
| The C-O-C asymmetrical stretching frequency of aryl alkyl ethers | 1226 cm−1 | Disappeared |
| The mixed vibrations of ν(C=O), δ(CCC), and δ(CC=O) aromatic ν(CC), ν(CCH) | 1452 cm−1 | 1385 cm−1 |
| The C=O stretching frequency | 1708 cm−1 | Disappeared |
| The -OH stretching frequency | 3347 cm−1 | 3345 cm−1 |