Table 2.
Assignments of vibrational bands of malachite green, crystal violet, furazolidone, and chloramphenicol [32,34,36,37].
| Chemical Compounds | Raman Shift (cm−1) | Band Assignment |
|---|---|---|
| Malachite green | 440 | γ (phenyl–C–phenyl) |
| 800 | γ (C–H) | |
| 914 | Ring-breathing | |
| 1171 | δ (C–H) | |
| 1368 | υip (N–phenyl), υip (C–C) | |
| 1614 | υip (C–C) | |
| Crystal violet | 423, 440 | γ (phenyl–C–phenyl) |
| 803 | γ (C–H) | |
| 915 | Ring-breathing | |
| 1176 | υip (C–H) | |
| 1373 | υip (N–phenyl), υip (C–C) | |
| 1617 | υip (C–C) | |
| Furazolidone | 808 | γ (C–H) |
| 960 | υ (C–C) | |
| 1015 | υ (ring) | |
| 1250 | δ (C–H) | |
| 1350 | υ (ring) | |
| 1491 | υs,ip (ring) | |
| 1560 | υas (NO2), υs (ring) | |
| 1606 | υs,ip (C=N) | |
| Chloramphenicol | 848 | Ring-breathing |
| 1109 | δ (N–H) | |
| 1350 | υs (NO2) | |
| 1600 | Ring stretching |
υs: Symmetric stretching; υas: Asymmetric stretching; δ: In-plane bending; γ: Out-of-plane bending; ip: In-plane.