Synthesis, Structural Characterization, and Biological Activity Studies of Ni(II) and Zn(II) Complexes

Table 2

IR spectral data of ligands and their metal complexes (cm⁻¹).

Compound	𝜈(OH)	𝜈(C=O) (𝛾 pyrone)	𝜈(C=N)	𝜈(CO) (carboxylate)	𝜈(C–S)	𝜈(M–N)	𝜈(M–O)
HL1	3241	1643	1605
HL2		1651	1605	1365
HL3	3246	1647	1591
HL4		1622	1597		790
[Ni(L1)2]		1619	1563			467	586
[Ni(L2)2]·H2O		1618	1570	1318		419	514
[Ni(L3)2]·H2O		1615	1563			480	500
[Ni(L4)2]		1598	1564		743	443	524
[Zn(L1)2]·H2O		1614	1574			460	599
[Zn(L2)2]		1615	1563	1347		480	500
[Zn(L3)2]		1615	1563			488	521
[Zn(L4)2]·H2O		1609	1581		751	441	505