Spectral Investigation and In Vitro Antibacterial Evaluation of Ni^II and Cu^II Complexes of Schiff Base Derived from Amoxicillin and α-Formylthiophene (αft)

Table 2

Characteristic IR band positions (cm⁻¹) of ligand and metal complexes.

Compound	ν(NH)	ν(C=N)	ν(C=O) lactam	ν(CH3)	ν(COO)	ν(M-N)
HL	3485.12 (br)	1661.56 (s)	1599.85	2965.69 (s)	1515.18	—
Ni(Haαft)2	3432.69 (br)	1651.25 (s)	1601.89	2963.51 (s)	1514.98	470.18
Cu(Haαft)2	3423.36 (br)	1652.09 (s)	1602.88	2961.96 (s)	1514.20	448.82