Table 6. FT-IR Spectrum Peak Attributions for FA.
| waverange/cm–1 | peak number | wavenumber/cm–1 | area/% | attribution |
|---|---|---|---|---|
| 3600–2800 | 1 | 3454 | 23.44 | phenolic hydroxyl |
| 2 | 3363 | 19.86 | phenolic hydroxyl | |
| 3 | 3238 | 18.11 | alcohol hydroxyl | |
| 4 | 3134 | 19.84 | hydroxyl on carboxylic acids | |
| 5 | 3030 | 9.01 | hydroxyl on carboxylic acids | |
| 6 | 2940 | 9.74 | RCH3 stretching vibration | |
| 1890–850 | 1 | 1725 | 33.79 | C=O on carboxylic acids |
| 2 | 1638 | 15.91 | COO– anti-symmetric stretching vibration | |
| 3 | 1405 | 15.56 | C–O on hydroxyl | |
| 4 | 1283 | 11.66 | C–O on phenyl ether | |
| 5 | 1191 | 13.33 | C–O on aliphatic ether | |
| 6 | 1106 | 6.06 | C–O on aliphatic ether | |
| 7 | 1017 | 3.68 | C–O on acid anhydride | |
| 830–690 | 1 | 801 | 15.23 | tri-substituted aromatics |
| 2 | 774 | 4.96 | di-substituted aromatics | |
| 3 | 748 | 3.81 | di-substituted aromatics | |
| 4 | 720 | 5.54 | di-substituted aromatics | |
| 5 | 696 | 4.95 | mono-substituted aromatics |