| Compound | ν (C=O) | ν (C=N) | ν (M-N) | ν (M-O) | V2 (ionic nitrate) |
| Ligand (L) | 1659 | 1563 | - | - | - |
| [Cu(L)1]Cl2 | 1635 | 1584 | 502 | 590 |
|
| [Cu(L)1](NO3)2 | 1620 | 1584 | 520 | 573 | 1374 |