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 5

ABTS radical scavenging activities (IC₅₀, µM) of standard drugs and H₂LL Schiff bases and their metal complexes.

Compounds
	H2LL	Cu(LL)	Ni(LL)	Co(LL)	Zn(LL)	Rutin	BHT
IC50  ±  SD	1.86 ± 2.28	2.15 ± 1.85	3.66 ± 1.16	1.83 ± 1.08	3.08 ± 0.76	2.83 ± 1.84	1.64 ± 1.54
	0.845	0.992	0.975	0.986	0.953	0.983	0.919

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