Table 5.
FTIR, 1H NMR and 13C NMR spectrums specification for DES and water phases.
| Component | Condition | Spectrums | Details |
|---|---|---|---|
| DES | After preparation | FTIR |
The peaks at 2856 cm−1 and 2926 cm−1 represents the stretching of ─CH2 and ─CH3 vibrations The peak at 1466 cm−1 represents the deformation vibration of ─CH2 or ─CH3 groups The peak at of 1712 cm−1 represents the stretching vibration of C = O The peak at of 1285 cm−1 represents stretching vibration of C─O The peak at of 938 cm−1 represents the stretching vibration of ─OH |
| 1H NMR | δ (ppm) = 0.83 (6H, 2CH3), 1.22 (24H, 12CH2), 1.47 (4H, 2CH2), 2.14 (4H, 2CH2), 2.49 (DMSO-d6), 11.87 (2H, 2OH) | ||
| 13C NMR | δ (ppm) = 14.16, 22.52, 24.95, 29.04, 31.66, 34.06, 39.57, 174.72 | ||
| After mixing with water | FTIR |
The peaks at 2856 cm−1 and 2927 cm−1 represents the stretching of ─CH2 and ─CH3 vibrations The peak at 1466 cm−1 represents the deformation vibration of ─CH2 or ─CH3 groups The peak at of 1712 cm−1 represents the stretching vibration of C = O The peak at of 1285 cm−1 represents stretching vibration of C─O The peak at of 937 cm−1 represents the stretching vibration of ─OH |
|
| 1H NMR | δ (ppm) = 0.83 (6H, 2CH3), 1.22 (24H, 12CH2), 1.47 (4H, 2CH2), 2.14 (4H, 2CH2), 2.49 (DMSO-d6), 11.87 (2H, 2OH) | ||
| 13C NMR | δ (ppm) = 14.15, 22.52, 24.95, 28.94, 31.66, 34.06, 39.89, 174.72 | ||
| Water | After mixing with DES | FTIR |
The peaks at 3435 cm−1 represents the stretching vibration of O─H The peaks at 1637 cm−1 represents the bending vibration of O─H |
| 1H NMR | δ (ppm) = 2.49 (DMSO-d6), 3.53 (2H, 2H2O) |