Synthesis, Characterization, Antioxidant, and Antibacterial Studies of Some Metal(II) Complexes of Tetradentate Schiff Base Ligand: (4E)-4-[(2-(E)-[1-(2,4-Dihydroxyphenyl)ethylidene]aminoethyl)imino]pentan-2-one

Table 6

Minimum inhibitory concentration values (mg/mL) of the Schiff base ligand H₂LL and its metal complexes.

Compounds	Gram-positive bacteria			Gram-negative bacteria
	S. faecalis	B. cereus	S. aureus	P. aeruginosa	S. flexneri	E. coli
H2LL	<10	10	<10	<10	<10	<10
Cu(LL)	5	2.5	5	<10	10	5
Ni(LL)	<10	10	5	10	<10	<10
Co(LL)	10	5	<10	<10	<10	10
Zn(LL)	<10	10	<10	<10	<10	10
Amoxicillin^a	1.250	0.312	1.250	1.250	1.250	0.625
Ciprofloxacin^a	0.312	0.312	0.312	0.312	0.312	0.312

Standards.