Table 2.
Assignments of IR bands corresponding to vibrations of EM, PVP-K30, and PRIII.
| Samples | Wavenumber (cm−1) | Assigment |
|---|---|---|
| EM | 3400 | O–H stretching vibration |
| 2968 | -CH3 stretching vibration | |
| 2932 | -CH2 stretching vibration | |
| 1730 | C=O stretching vibration | |
| 1600 and 1554 | C=C stretching vibration in benzene rings | |
| 1452 and 1380 | C-H in-plane bending vibration (saturated bond) | |
| 1158 and 1118 | C=O bending vibration in ester groups | |
| 1000-650 | Region of C-H out of plane bending vibration (unsaturated bond) | |
| PVP-K30 | 3416 | N–H stretching vibration |
| 2956 | C–H stretching vibration (saturated bond) | |
| 1654 | C=C stretching vibration in alkene bonds | |
| 1462 and1372 | C-H in-plane bending vibration (saturated bond) | |
| 1290 | O–H in-plane bending vibration | |
| PRIII | 3000 and 2948 | C–H stretching vibration (saturated bond) |
| 1726 | C=O stretching vibration in ester groups | |
| 1485, 1454 and 1274 | C–H in-plane bending vibration (saturated bond) | |
| 962 and 752 | C–H in-plane bending vibration (unsaturated bond) |