Table 1.

FT-IR characteristic absorption of Fe₃O₄@Pectin@(CH₂)₃-Acetamide-Cu(II) catalyst components.

Spectra	Functional group	Absorption (cm−1)
Fe3O4	Fe–O stretch	574
	O–H stretch	3420
Pectin	COO– symmetric stretching	1412
	COO– asymmetric stretching	1618
	C=O of ester	1725
	C–H stretch	2923
	O–H stretching alcoholic and acidic	3400–3600
Fe3O4@Pectin	Fe–O stretch	577
	COO– asymmetric stretching	1626
	C–H stretch	2923
	O–H stretch	3422
Fe3O4@Pectin@APTES	C–N stretch	1100
	Si–O stretch	1200
	NH2 stretch	3200
Fe3O4@Pectin@(CH2)3-Acetamide	C=N stretch	1650