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 2

Important IR spectral bands (cm⁻¹) of Schiff bases and their metal complexes.

Compound	ν(N=CH)	ν(C–S)	ν(S–H)	ν(H2O/OH)	ν(M–S)	ν(M–N)
HL^1	1622	—	2739	—	—	—
Co(L^1)2·2H2O	1613	733	—	3441	360	502
Ni(L^1)2·2H2O	1607	734	—	3356	347	512
Cu(L^1)2	1612	715	—	—	351	497
Zn(L^1)2·2H2O	1610	717	—	3425	361	511
HL^2	1625	—	2770	—	—	—
Co(L^2)2·2H2O	1613	735	—	3440	355	493
Ni(L^2)2·2H2O	1611	730	—	3410	347	490
Cu(L^2)2	1609	710	—	—	362	503
Zn(L^2)2·2H2O	1606	718	—	3395	353	510