Spectroscopic, Thermal, and Antimicrobial Studies of Co(II), Ni(II), Cu(II), and Zn(II) Complexes Derived from Bidentate Ligands Containing N and S Donor Atoms

Table 1

¹H NMR and ¹³C NMR spectral data of Schiff bases and their metal complexes.

Compounds	^1H NMR (DMSO-d6) (ppm)	^13C NMR (DMSO-d6) (ppm)
HL^1  [C7H5N5O3S]	7.55 (d, 1H, Ar–H), 7.84 (d, 1H, Ar–H),; 8.97 (s, triazole–H), 9.86 (s, 1H, –N=CH–),; 14.10 (s, 1H, –SH)	114.37, 120.34, 139.44, 146.98, 149.43, 152.12 (Aromatic), 163.34 (–N=CH–)
Zn(L^1)2·2H2O; [C14H12N10O8S2Zn]	7.42 (d, 2H, Ar–H), 7.66 (d, 2H, Ar–H), 9.05; (s, 2H, triazole–H), 10.12 (s, 2H, –N=CH–)	114.31, 121.02, 139.28, 146.76, 150.22, 152.38 (Aromatic), 171.18 (–N=CH–)
HL^2  [C10H11N5O3S]	0.93 (t, 3H, –CH3), 1.66 (m, 2H, –CH2–), 2.69; (t, 2H, –CH2–), 7.63 (d, 1H, Ar–H),; 7.84 (d, 1H, Ar–H), 10.42 (s, 1H, –N=CH–),; 13.91 (s, 1H, –SH)	13.84 (–CH3), 19.21 (–CH2–), 26.69 (–CH2–), 114.32, 120.4, 148.28, 149.50, 151.97, 153.52 (Aromatic), 161.9 (–N=CH–)
Zn(L^2)2·2H2O   [C20H24N10O7S2Zn]	0.80 (t, 6H, –CH3), 1.57 (m, 4H, –CH2–), 2.63; (t, 4H, –CH2–), 7.69 (d, 2H, Ar–H), 7.85; (d, 2H, Ar–H), 10.83 (s, 2H, –N=CH–)	13.74 (–CH3), 19.63 (–CH2–), 26.79 (–CH2–), 114.22, 121.5, 148.75, 152.87, 153.50, 153.70 (Aromatic), 169.72 (–N=CH–)