Microwave Assisted Synthesis, Spectral and Antifungal Studies of 2-Phenyl-N,N′-bis(pyridin-4-ylcarbonyl)butanediamide Ligand and Its Metal Complexes

Table 3

Relevant IR spectral peaks (cm⁻¹) and their assignments.

Complexes	𝜈 N–H	Amide-I [𝜈 C=O]	Amide-II [𝜈 C–N, 𝛿 N–H]	Amide-III [𝛿 N–H]	𝜈 M–N	𝜈 M–Cl	𝜈 M–(CH3COO)
							(asym)	(sym)
[C22H18N4O4]	3483	1645	1580	1255
[CoL]Cl2	3250	1632	1565	1232	445	340	—
[CoL(CH3COO)2]	3165	1640	1552	1225	456	—	1564	1325
[NiL]Cl2	3153	1638	1558	1242	459	354	—
[NiL(CH3COO)2]	3147	1625	1569	1220	454	—	1595	1315
[CuL]Cl2	3150	1630	1570	1238	425	350	—
[CuL(CH3COO)2]	3145	1628	1563	1222	432	—	1560	1330

L = [(C₂₂H₁₈N₄O₄)].