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 3

The ¹H NMR spectral data (δ, ppm) of ligand.

Compound	Chemical shift; δ ppm	Assignment
HL	6.7–7.0	2d, 4H, aromatic protons
	9.95	s, 1H, azomethine protons
	7.1–8.0	m, 3H, thiophene ring protons
	0.9–1.4	s, 6H, methyl protons
	3.4–4.1	s, 3H, CH3 of ester group
	8.5	s, 1H, NH proton