Table 2.
IR spectral (cm−1), and 1H-NMR (δ, ppm) data of the imine ligand (L), the co-ligand (bpy), and its mixed ligand complexes.
| Compound under study | IR spectra (cm−1) | 1H-NMR (δ, ppm) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ν(OH2) | ν(C = N) azomethine / pyridyl | ν(C–O–C) (furan) | δ(py) (bending) | υ(M–O) | υ(M–N) | Additional bands | |||
| L | – | 1614 | – | 1284 | – | – | – | – | s (8.47, HC = N); m (8.12–8.10, 3H–fur., J = 8; 7.03–7.01, 3H–fur., J = 10; 5.89–5.85, 3H–arm., J = 16); 2.56 (s, C–CH3) |
| 2,2′-bipyridine | – | – | 1553 | – | 660 | – | – | – | |
| [FeL(bpy)]Cl3·H2O | 3411 | 1602 | 1569 | 1309 | 648 | 582 | 481 | – | – |
| [CoL(bpy)]Cl2·3H2O | 3440 | 1601 | 1568 | 1289 | 651 | 580 | 495 | – | – |
| [CuL(bpy)]Cl2 | – | 1602 | 1567 | 1286 | 659 | 580 | 484 | – | – |
| [CdL(bpy)](NO3)2 | – | 1598 | 1587 | 1299 | 649 | 596 | 497 | 1384; νNO3 ionic | s (8.99, HC = N); m (7.64–7.61, 3H–fur., J = 10; 7.15–7.12, 3H–fur., J = 11.2; 5.73–5.72, 3H–arm., J = 5.2); 2.72 (s, C–CH3) |