Table 3.
Peak values and functional groups of Pg dried extract in the FT-IR spectra
| Characteristic absorptions [cm− 1] leaves extract / stems extract |
Functional group | Bond | Intensity |
|---|---|---|---|
| 3392.79 | Alcohol |
O-H stretch (H-bonded) |
Strong, broad |
| 2926.01 | Alkanes | C-H stretch | Strong |
| 2854.65 | Aldehyde | =C-H stretch | Medium, two peaks |
| 1685.79 / 1629.85 | Alkene | C=C stretch | Variable |
| 1604.77 | Aromatics | C=C stretch | Medium-weak, multiple bands |
| 1514.12 / 1375.25 | Nitro | N-O stretch | Strong, two bands |
| 1450.47 | Alkane | C-H bending | Variable |
| 1267.23 | Carbonyl acids | C-O stretch | Strong |
| Amine | C-N stretch | Medium - weak | |
| 1163.08 | Amine | C-N stretch | Medium - weak |
| 1074.35 / 1033.85 | Alcohol | C-O strecth | Strong |
| Ester | C-O stretch | Two bands or more | |
| 831.32 / 765.74 / 698.23 | Alkene | =C-H bending | Strong |
| Alkyl Halide | C-Cl stretch | Strong | |
| 518.85 | Alkyl Halide | C-Br stretch | Strong |