Study of Synthesis, Characterization, DFT, and In Vitro Biological Activity of Cu(II), Co(II), and Fe(II) Metal Complexes Based on Heterocyclic Azo Pyrazole Dye Ligand

Table 2

Important FT-IR spectral bands (cm⁻¹) of the HL ligand and its complexes.

Compound	γ (N-H)	γ (C=O)	γ (C=C)	γ (C=N)	γ (N=N)	γ (C-OH)	γ (M-N)	γ (M-O)	γ (M-Cl)
[HL]	3305–3434	1691	1656	1551	1473	1235	—	—	—
[Cu(II)L]	3232–3340	1622	1591	1503	1386	1286	551	619	502
[Co(II)L)]	3244–3392	1627	1595	1501	1382	1289	561	598	439
[Fe(II)L]	3094–3675	1615	1563	1474	1409	1241	543	595	452