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 1

Analysis and physical properties of Schiff base and the corresponding complexes.

Compounds	Color	Yield (%)	Melting point (°C)	Molar mass (g·mol^−1)	% found (calculated)			Λm (Ω^−1·cm^2·mol^−1)
					C	H	N
H2L1	Yellow	92.00	160	279.36	73.00 (73.09)	4.43 (4.69)	4.90 (5.01)	0.6
CuL1	Dark green	61.70	˃360	681.77	61.34 (59.90)	3.03 (3.25)	4.07 (4.11)	2.0
CoL1	Dark brown	65.50	˃360	686.06	59.47 (59.52)	3.42 (3.45)	3.96 (4.08)	1.2
NiL1	Red	64.40	˃360	672.07	60.64 (60.76)	3.28 (3.30)	3.98 (4.17)	0.8