Table 2. Wavenumbers Associated with C2–H of the Cation Imidazolium Ring and O=C–O of the Anion for DMSO/IL Mixtures Before and After the Addition of 5 wt % Cellulose at 25 °C for 2 h.
| DMSO/IL |
DMSO/IL-MCC |
|||||
|---|---|---|---|---|---|---|
| samples | υC2–H | υO=C–O | υC2–H | υO=C–O | ΔυC2–H | ΔυO=C–O |
| DMSO/[C4mim][CH3COO]-10:1 | 3141.4 | 1380.5 | 3145.0 | 1385.2 | 3.6 | 4.7 |
| DMSO/[C4mim][CH3COO]-5:1 | 3141.2 | 1380.9 | 3144.0 | 1384.8 | 2.8 | 3.9 |
| DMSO/[C4mim][CH3COO]-2:1 | 3140.7 | 1381.9 | 3143.3 | 1383.6 | 2.6 | 2.7 |
| DMSO/[C4mim][CH3COO]-1:1 | 3140.3 | 1382.2 | 3141.8 | 1383.6 | 1.5 | 1.4 |
| DMSO/[C3mim][CH3COO]-10:1 | 3141.1 | 1379.8 | 3143.8 | 1382.6 | 2.7 | 2.8 |
| DMSO/[C3mim][CH3COO]-5:1 | 3140.9 | 1380.3 | 3142.6 | 1382.3 | 1.7 | 2.0 |
| DMSO/[C3mim][CH3COO]-2:1 | 3140.7 | 1380.9 | 3141.9 | 1382.7 | 1.2 | 1.8 |
| DMSO/[C3mim][CH3COO]-1:1 | 3139.9 | 1381.5 | 3140.7 | 1382.7 | 0.8 | 1.2 |
| DMSO/[C2mim][CH3COO]-10:1 | 3140.6 | 1379.6 | 3142.6 | 1382.1 | 2.0 | 2.5 |
| DMSO/[C2mim][CH3COO]-5:1 | 3140.2 | 1379.8 | 3141.7 | 1381.7 | 1.5 | 1.9 |
| DMSO/[C2mim][CH3COO]-2:1 | 3139.9 | 1380.4 | 3140.6 | 1382.1 | 0.7 | 1.7 |
| DMSO/[C2mim][CH3COO]-1:1 | 3139.5 | 1381.3 | 3139.9 | 1382.4 | 0.4 | 1.1 |