Table 3: Vibrational frequencies for Schiff base-copper(II) complexes.
Experimental | Frequency (cm−1) | |||||
Amine N-H stretch | Imine C=N stretch | Aromatic C=C stretch | Alkenyl C=C stretch | Cu-O | Cu-N | |
Cu(L1)2 | — | 1,636 | 1,586 | 1,590 | 519, 557 | 483, 625 |
Cu(L2)2 | — | 1,620 | 1,564 | 1,605 | 508, 553 | 487, 616 |
Cu(L3)3 | 3,369 | 1,674 | 1,507 | 1,603 | 510, 551 | 487, 616 |