Table 3 Characteristic peaks of EHL and their assignments.
Wave number/cm−1 | Characteristic peaks of functional groups and their assignments |
|---|---|
1700 | Non-conjugated carbonyl |
1650–1655 | Conjugated carbonyl |
1600–1605, 1505–1515 | Vibration of aromatic skeleton |
1460–1470 | C-H deformation vibration of methyl or methylene |
1424 | C-H plane deformation vibration on aromatic nucleus |
1328 | Syringyl |
1266–1270 | Guaiaretic nuclear methoxy C-O vibration |
1220–1230 | C-O vibration of the aromatic nucleus related to syringyl |
1167 | C-O-C stretching vibration in ester bond |
1125–1130 | Aromatic nucleus C-H vibration |
1120 | In-plane bending vibration of syringyl ring C-H |
1030–1036 | In-plane deformation vibration of aromatic C-H |
833–835 | Out-of-plane bending vibration of aromatic nucleus C-H |
