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)21,6361,5861,590519, 557483, 625
Cu(L2)21,6201,5641,605508, 553487, 616
Cu(L3)33,3691,6741,5071,603510, 551487, 616