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 3

¹H-NMR data of ligand and its complexes.

Compounds	δ(O-H)	δ(N=C-H)	δ(S-H)	δ(Ar-H)	δ(H2O)
H2L1	15.01 ppm (s, 1H)	9.78 ppm (s, 1H)	3.35 ppm (s, 1H)	7.89–7.02 (m, 10H)	—
CuL1	—	8.09 ppm (s, 1H)	—	7.25–6.45 (m, 10H)	—
CoL1	—	8.36 ppm (s, 1H)	—	7.59–6.69 (m, 10H)	3.34 ppm (s, 2H)
NiL1	—	8.31 ppm (s, 1H)	—	7.78–6.69 (m, 10H)	—