Table 2.
Wavenumbers and assignments (according to literature data) obtained by ATR-FTIR analysis for pure Carv and TOH and essential oils.
| Carv | TOH | T. vulgaris | O. vulgare | O. x applii | |
|---|---|---|---|---|---|
| -OH stretching vibration [17] | 3378 cm−1 | 3171 cm−1 | 3553 and 3411 cm−1 | 3527 and 3392 cm−1 | 3535 and 3354 cm−1 |
| aliphatic –CH2/-CH3 stretching [17] | 2954, 2929 and 2867 cm−1 | 2958, 2928 and 2868 cm−1 | 2959, 2928 and 2870 cm−1 | 2960, 2927 and 2870 cm−1 | 2960, 2928 and 2871 cm−1 |
| TOH key characteristic peak [14, 15] | 1286 cm−1 | 1291 cm−1 | |||
| Carv key characteristic peak [14] | 1251 cm−1 | 1254 cm−1 | |||
| Carv key characteristic peak [15] | 1173 cm−1 | 1181 cm−1 | 1177 cm−1 | 1175 cm−1 | |
| TOH meta-substitution [14] | 1156 cm−1 | 1152 cm−1 | 1143 cm−1 | ||
| Carv ortho-substitution [14, 15] | 1116 cm−1 | 1112 cm−1 | 1115 cm−1 | 1116 cm−1 | |
| TOH key characteristic peak [15] | 1096 cm−1 | 1089 cm−1 | 1103 cm−1 | ||
| TOH1:3:4-substitution [15] | 1036 cm−1 | ||||
| Carv 1:2:4-Substituion [14] | 994 cm−1 | 995 cm−1 | 996 cm−1 | 995 cm−1 | |
| TOH key characteristic peak [14, 15] | 943 cm−1 | 945 cm−1 | 937 cm−1 | ||
| Carv key characteristic peak [14] | 865 cm−1 | 864 cm−1 | |||
| Carv C–H out-of-plane [14] | 812 cm−1 | 813 cm−1 | |||
| TOH C–H out-of-plane [14, 15] | 804 cm−1 | 808 cm−1 | |||
| TOH ring vibrations [15] | 740 cm−1 | 739 cm−1 | 740 cm−1 |