Table 3.
Characteristic IR bands (cm-1) of the ligand HL and its metal complexes.
| Compound | ν(C=N) | ν(N-H) | ν(N-N) | ν(M-N) | ν(C=C) | Other bands |
| C16H12N3Cl (HL) | 1534 s | 3300 m | 1140 s | --- | 1578 s | --- |
| [Cu((L)2]·EtOH (1) C34H28N6OCl2Cu |
1520 s | --- | 1136 s | 420 w | 1580 s | 3426 m, br (νOH-alcohol) |
| [Ni(L)2(OH2)2]·2EtOH (2) C36H38N6O4Cl2Ni |
1510 m | --- | 1137 w | 425 w | 1577 s | 3440 m, br (νOH-coordinated water, overlapped with νOH-alcohol) |
| [Co(L)2(OH2)2] (3) C32H26N6O2Cl2Co |
1514 sh | --- | 1125 w | 410 w | 1577 s | 3436 m, br (νOH-coordinated water) |
| [Mn(L)2(OH2)2] (4) C32H26N6O2Cl2Mn |
1527 sh | --- | 1136 s | 445 w | 1582 s | 3438 m, br (νOH-coordinated water) |
| [Fe(L)2(Cl)(OH2)2]·3EtOH (5) C38H44N6O5Cl3Fe | 1507 m | --- | 1137 s | 465 w | 1577 s | 3440 m, br (νOH-coordinated water, overlapped with νOH-alcohol). 395 m (νFe-Cl) |
| [UO2(L)2(OEt)]·EtOH (6) C36H33N6O4Cl2U |
1505 | --- | 1134 s | 460 w | 540 w | 3435 m, br (νOH- coordinated alcohol) 901 s ν3(O=U=O) |
s: strong, w : weak, m : medium, br. : broad, sh : shoulder