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| JC-leaf wavenumber (cm−1) | Probable functional group | JC-CuNPs wavenumber (cm−1) | Probable functional group |
|---|---|---|---|
| 3380 | Broad for O–H | 2980 | Broad for O–H |
| 2359 | Strong for C–H | 2361 | Strong for C–H |
| 1589 | Medium for C N | 1567 | Broad C N |
| 1046 | Medium for C–O | — | — |
| 669 | Strong for C–Cl | 667 | Strong for C–Cl |
| 418 | Strong | 408 | Strong Cu–O |
