Table 2 The main absorption peaks in FT-IR spectra of rosin reagent and Samp and their proposed assignments [19, 20]
Rosin reagent/cm−1 | Samp/cm−1 | Band assignment |
|---|---|---|
3438 (b) | 3438 (b) | v OH |
3080 (w) | 3076 (w) | vas =C–H |
2958, 2867 (vs) | 2955, 2868 (vs) | vas CH3, vs CH3 |
2929, 2851 (vs) | 2929, 2850 (vs) | vas CH2, vs CH2 |
1695 (vs) | 1695 (vs) | v C=O |
1639 (w) | 1633 (w) | v C=C |
(nb) | 1607, 1556, 1540, 1521, 1497 (w) | γ ψ (vibration of aromatic ring skeleton) |
1465 (m) | 1465 (m) | ρ CH2 |
1460 (m) | 1460 (m) | δas CH3 |
1385, 1365 (m-w) | 1385, 1365 (m-w) | δs CH3 |
1278, 1252, 1233 (m-w) | 1276, 1252, 1233 (m-w) | v C–OH in carboxylic acids |
1188, 1179, 1152 (m) | 1189, 1179, 1152 (m) | v C–OH in carboxylic acids and 2° alcohols |
1047, 1038 (w) | 1047, 1038 (w) | v C–OH in 1° and 3° alcohols |
950 (m) | 950 (m) | γ O–H in carboxylic acids |
890 (m) | 886 (vw) | γ =C–H in RR′C = CHR′′ |