Table 4.

FTIR spectral assignments (cm⁻¹) for Schiff base ligand H₃L and complexes 1–4.

Compounds	ν(C=N)	ν(C–H)	ν(Cu–O)	ν(Cu–N)
H3L	1649	3058	-	-
1	1600	3089	460	437
2	1569	-	464	447
3	1596	1550	622	419
4	1668	1550	568	461