Synthesis, Characterization, Cyclic Voltammetry, and Biological Studies of Co(II), Ni(II), and Cu(II) Complexes of a Tridentate Schiff Base, 1-((E)-(2-Mercaptophenylimino) Methyl) Naphthalen-2-ol (H₂L₁)

Table 6

Diameter of the zone of inhibition (DZI) of bacteria.

Diameter of zone of inhibition (DZI)
Bacteria	Compounds				Standard
	H2L1	CuL1	CoL1	NiL1	Ciprofloxacin
E. coli	—	—	12	—	29
S. aureus	—	13	12	—	39
P. aeruginosa	—	—	—	9	26
E. faecalis	—	—	—	—	29
P. mirabilis	—	10	—	11	30

Compounds are considered active when their diameters of the zone of inhibition are greater than 6 mm (DZI ˃ 6 mm) and (—) no activities are observed.