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 4

DPPH scavenging capacities (IC₅₀, µM) of standard drugs and H₂LL Schiff Bases and their metal complexes.

Compounds
	H2LL	Cu(LL)	Ni(LL)	Co(LL)	Zn(LL)	Vitamin C	Rutin
IC50  ±  SD	6.47 ± 2.96	2.31 ± 1.54	2.34 ± 0.85	3.18 ± 0.96	3.93 ± 1.64	1.92 ± 1.07	2.52 ± 1.60
	0.909	0.992	0.977	0.968	0.969	0.978	0.768

,   ±  SEM); IC₅₀: inhibitory concentration; = correlation coefficient. Standards.